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Batra SWT (1966) The life cycle and behavior of the primitively social bee Lasioglossum zephyrum (Halictidae). University of Kansas Science Bulletin 46: 359-423.

Batra SWT (1980) Ecology, behavior, pheromones, parasites and management of the sympatric vernal bees Colletes inaequalis, C. thoracicus and C. validus. Journal of the Kansas Entomological Society 53(3): 509-538.

Batra SWT (1990) Bionomics of a vernal solitary bee Andrena (Scrapteropsis) alleghaniensis Viereck in the Adirondacks of New York (Hymenoptera: Andrenidae). Journal of the Kansas Entomological Society 63(2): 260-266. http://www.jstor.org/stable/25085175

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Bohart GE (1948) New North American bees of the genus Dufourea (Hymenoptera: Halictidae) Part II. Annals of the Entomological Society of America 41(1): 191-136. [Dufourea dilatipes Bohart, 1948] https://doi.org/10.1093/aesa/41.1.119

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Cane JH, Eickwort GC, Wesley FR, Spielholz J (1983) Foraging, grooming and mate-seeking behaviors of Macropis nuda (Hymenoptera, Melittidae) and use of Lysimachia ciliata (Primulaceae) oils in larval provisions and cell linings. American Midland Naturalist 110(2): 257-264. [Macropis (Macropis) ciliata Patton, 1880, Macropis nuda (Provancher, 1882)] https://doi.org/10.2307/2425267

Cane JH, Eickwort GC, Wesley FR, Spielholz J (1985) Pollination ecology of Vaccinium stamineum (Ericaceae: Vaccinioideae). American Journal of Botany 72(1): 135-142. [Melitta (Cilissa) americana (Smith, 1853)] http://www.jstor.org/stable/2443575

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Cockerell TDA (1895) New bees of the genus Halictus from New Mexico, U.S.A. Annals and Magazine of Natural History, Series 6 16(91): 63-69. https://doi.org/10.1080/00222939508680230

Cockerell TDA (1896) The bees of the genus Andrena found in New Mexico. Annals and Magazine of Natural History, Series 6 18(103): 78-92. https://doi.org/10.1080/00222939608680413

Cockerell TDA (1896) New North American bees. The Entomologist's Monthly Magazine 32: 218-221.

Cockerell TDA (1896) Contributions from the New Mexico biological station—I. Descriptions of new bees collected by Prof. C.H.T. Townsend in the state of Vera Cruz. Annals and Magazine of Natural History, Series 6 18(106): 282-295. https://doi.org/10.1080/00222939608680457

Cockerell TDA (1897) New and little-known North American bees. Proceedings of the Academy of Natural Sciences of Philadelphia 49: 334-355. [Osmia atrocyanea atrocyanea Cockerell, 1897, Osmia bruneri Cockerell, 1897, Osmia marginipennis Cresson, 1878, Calliopsis australior Cockerell, 1897] http://www.jstor.org/stable/4062289

Cockerell TDA (1897) Contributions from the New Mexico biological station.—III.  The bees of the genus Colletes found in New Mexico. Annals and Magazine of Natural History, Series 6 19(109): 39-52. [Colletes aberrans Cockerell, 1897, Colletes gilensis Cockerell, 1897] https://doi.org/10.1080/00222939708680506

Cockerell TDA (1898) A southern type of Andrena in Connecticut. Entomological News 9: 171-72.

Cockerell TDA (1898) New bees from New Mexico. The Canadian Entomologist 30(6): 146-148. https://doi.org/10.4039/ent30146-6

Cockerell TDA (1898) Notes on some bees of the genus Andrena from Hartford, Connecticut. The Canadian Entomologist 30(4): 103-104. https://doi.org/10.4039/ent30103-4

Cockerell TDA (1898) On some panurgine and other bees. Transactions of the American Entomological Society 25: 185-198. [Panurginus atriceps (Cresson, 1878)] http://www.jstor.org/stable/25076687

Cockerell TDA (1898) New and little-known bees. The Canadian Entomologist 30(3): 50-53. https://doi.org/10.4039/ent3050-3

Cockerell TDA (1898) Panurginus clypeatus. The Canadian Entomologist 30 (2): 29. [Panurginus cressoniellus Cockerell, 1898] https://doi.org/10.4039/ent3029-2

Cockerell TDA (1900) Observations on bees collected at Las Vegas, New Mexico, and in the adjacent Mountains. Annals and Magazine of Natural History, Series 7 5(29): 401-416. [Anthidium porterae Cockerell, 1900, Osmia subaustralis Cockerell, 1900] https://doi.org/10.1080/00222930008678307

Cockerell TDA (1901a) A new bee from California. Zeitschrift für Systematische Hymenopterologie und Dipterologie 1(2): 80. [Andrena knuthiana Cockerell, 1901]

Cockerell TDA (1901b) A new Andrena from California. Entomological News 12: 74. [Andrena knuthiana Cockerell, 1901]

Cockerell TDA (1901) Some insects of the Hudsonian Zone in New Mexico—VI. Psyche 9(308): 282-287. [Andrena birtwelli Cockerell, 1901, Andrena (Andrena) washingtoni Cockerell, 1901] https://doi.org/10.1155/1901/483090

Cockerell TDA (1901) Some insects of the Hudsonian Zone in New Mexico—III. Psyche 9(298): 163-164. [Panurginus cressoniellus Cockerell, 1898] https://doi.org/10.1155/1901/34954

Cockerell TDA (1901) On some bees of the genus Andrena from New Jersey. Journal of the New York Entomological Society 9(3): 132-134. http://www.jstor.org/stable/25002948

Cockerell TDA (1902) Some Insects of the Hudsonian Zone in New Mexico—VIII. Psyche 9(313): 346-347. https://doi.org/10.1155/1902/58549

Cockerell TDA (1902) North-American bees of the genus Andrena. Annals and Magazine of Natural History, Series 7 9(50): 101-106. https://doi.org/10.1080/00222930208678552

Cockerell TDA (1902) New bees of the genus Andrena, from Wisconsin. The Canadian Entomologist 34(2): 45-47. https://doi.org/10.4039/ent3445-2

Cockerell TDA (1903) New bees from southern California and other records. Bulletin of the Southern California Academy of Sciences 2: 84-85.

Cockerell TDA (1903) North-American bees, and a new Homopteron. Annals and Magazine of Natural History, Series 7 12(70): 442-455. [Diadasia ochracea (Cockerell, 1903)] https://doi.org/10.1080/00222930308678879

Cockerell TDA (1904) New records of bees. The Entomologist 37: 231-236. [Panurginus beardsleyi (Cockerell, 1904), Sphecodes arroyanus Cockerell, 1904]

Cockerell TDA (1904) Records of American bees. The Canadian Entomologist 36(1): 13-14. https://doi.org/10.4039/ent3613-1

Cockerell TDA (1904) Descriptions and records of bees. Annals and Magazine of Natural History, Series 7 14(79): 21-30. [Heriades carinata Cresson, 1864, Brachymelecta interrupta (Cresson, 1872)] https://doi.org/10.1080/03745480409442962

Cockerell TDA (1905) New bees of the genera Osmia and Andrena. The Canadian Entomologist 37(11): 370-372. [Osmia texana Cresson, 1872] https://doi.org/10.4039/ent37370-11

Cockerell TDA (1905) The bees of southern California. Bulletin of the Southern California Academy of Sciences 4: 99-106. [Habropoda tristissima (Cockerell, 1904)]

Cockerell TDA (1905) The bees of southern California. VIII. Bulletin of the Southern California Academy of Sciences 4: 28-33.

Cockerell TDA (1906) New Rocky Mountain bees, and other notes. The Canadian Entomologist 38(5): 160-166. [Hoplitis hypocrita (Cockerell, 1906)] https://doi.org/10.4039/ent38160-5

Cockerell TDA (1906) The bees of Florissant, Colorado. Bulletin of the American Museum of Natural History 22: 419-455. [Andrena (Andrena) topazana Cockerell, 1906, Osmia cyaneonitens Cockerell, 1906, Nomada crawfordi Cockerell, 1905]

Cockerell TDA (1906) North American bees of the genera Andrena and Melitta in the British Museum.–I. Psyche 13: 5-10. [Melitta (Cilissa) americana (Smith, 1853)]

Cockerell TDA (1906) Descriptions and records of bees.—IX. Annals and Magazine of Natural History, Series 7 17(99): 306-317. [Colletes andrewsi Cockerell, 1906, Colletes brevicornis Robertson, 1897] https://doi.org/10.1080/00222930608562528

Cockerell TDA (1907) Descriptions and records of bees.—XIII. Annals and Magazine of Natural History, Series 7 19(113): 361-370. [Andrena milwaukeensis Graenicher, 1903, Osmia atrocyanea atrocyanea Cockerell, 1897, Osmia cyaneonitens Cockerell, 1906, Osmia marginipennis Cresson, 1878, Osmia subaustralis Cockerell, 1900] https://doi.org/10.1080/00222930708562656

Cockerell TDA (1907) Descriptions and records of bees.—XIV. Annals and Magazine of Natural History, Series 7 19(114): 531-540. [Andrena perarmata Cockerell, 1898, Nomada crawfordi Cockerell, 1905] https://doi.org/10.1080/00222930709487287

Cockerell TDA (1907) The bees of Boulder County, Colorado. The University of Colorado Studies 4: 239-259. [Colletes brevicornis Robertson, 1897, Heriades carinata Cresson, 1864]

Cockerell TDA (1907) Descriptions and records of bees.—XVI. Annals and Magazine of Natural History, Series 7 20(116): 122-132. [Andrena bradleyi Viereck, 1907, Osmia bruneri Cockerell, 1897, Osmia marginipennis Cresson, 1878] https://doi.org/10.1080/00222930709487315

Cockerell TDA (1908) New American bees.—VI. The Entomologist 41: 59-61.

Cockerell TDA (1908) New American bees.—VII. The Entomologist 41: 292-294.

Cockerell TDA (1909) Descriptions and records of bees.—XXI. Annals and Magazine of Natural History, Series 8 4(19): 25-31. [Calliopsis coloradensis Cresson, 1878, Agapostemon sericeus (Forster, 1771), Hylaeus fedorica (Cockerell, 1909), Osmia subfasciata Cresson, 1872] https://doi.org/10.1080/00222930908692634

Cockerell TDA (1910) Some insects from Steamboat Springs, Colo.—II. The Canadian Entomologist 42(11): 366-370. https://doi.org/10.4039/ent42366-11

Cockerell TDA (1910) Descriptions and records of bees.—XXVI. Annals and Magazine of Natural History, Series 8 5(27): 256-264. https://doi.org/10.1080/00222931008692763

Cockerell TDA (1910) Descriptions and records of bees.—XXVII. Annals and Magazine of Natural History, Series 8 5(28): 361-369. [Nomada aldrichi Cockerell, 1910] https://doi.org/10.1080/00222931008692781

Cockerell TDA (1911) Some bees from western Canada. The Canadian Entomologist 43(1): 33-34. [Megachile dentitarsus Sladen, 1919] https://doi.org/http://dx.doi.org/10.4039/Ent4333-1

Cockerell TDA (1912) Descriptions and records of bees.—XLV. Annals and Magazine of Natural History, Series 8 10(55): 21-31. https://doi.org/10.1080/00222931208693193

Cockerell TDA (1913) Descriptions and records of bees.—LIV. Annals and Magazine of Natural History, Series 8 12(70): 368-376. https://doi.org/10.1080/00222931308693411

Cockerell TDA (1913) Two new Canadian bees. The Canadian Entomologist 45(1): 12-14. [Sphecodes confertus Say, 1837, Sphecodes hudsoni Cockerell, 1911] https://doi.org/10.4039/ent4512-1

Cockerell TDA (1915) Descriptions and records of bees.—LXV. Annals and Magazine of Natural History, Series 8 15(87): 261-269. [Andrena milwaukeensis Graenicher, 1903] https://doi.org/10.1080/00222931508693638

Cockerell TDA (1916) Two new bees from New Jersey. Bulletin of the Brooklyn Entomological Society 11: 11. https://biostor.org/reference/169777

Cockerell TDA (1916) New and little-known bees. The Entomologist 49: 156-160.

Cockerell TDA (1916) Some Rocky Mountain andrenid bees. The Canadian Entomologist 48(7): 252-254. https://doi.org/10.4039/ent48252-7

Cockerell TDA (1916) Some bees from Colorado. The Entomologist 49: 100-102.

Cockerell TDA (1916) Some bees in the British Museum. The Canadian Entomologist 48(8): 272-274. [Nomada aldrichi Cockerell, 1910, Nomada vernonensis Cockerell, 1916] https://doi.org/10.4039/ent48272-8

Cockerell TDA (1916) New and little known bees from California. Pomona Journal of Entomology and Zoology 8(2): 43-64.

Cockerell TDA (1918) Some halictine bees. The Entomologist 51: 261-262.

Cockerell TDA (1918) Descriptions and records of bees.—LXXIX. Annals and Magazine of Natural History, Series 9 1(2): 158-167. https://doi.org/10.1080/00222931808562297

Cockerell TDA (1919) The bees of Peaceful Valley, Colorado. Journal of the New York Entomological Society 27(4): 298-300. http://www.jstor.org/stable/25003869

Cockerell TDA (1919) The bees of Gold Hill, Colorado. The Canadian Entomologist 51(12): 271-273. https://doi.org/10.4039/ent51271-12

Cockerell TDA (1922) Bees in the collection of the United States National Museum.—4. Proceedings of the United States National Museum 60: 1-20. [Nomada bella bella Cresson, 1863, Sphecodes heraclei heraclei Robertson, 1897]

Cockerell TDA (1922) Descriptions and records of bees.—XCVI. Annals and Magazine of Natural History, Series 9 10(59): 544-550. https://doi.org/10.1080/00222932208632802

Cockerell TDA (1924) Bees of the genus Andrena in the collection of the California Academy of Sciences. The Pan-Pacific Entomologist 1(2): 57-65.

Cockerell TDA (1924) Expedition of the California Academy of Sciences to the Gulf of California in 1921. The bees (II). Proceedings of the California Academy of Sciences, Series 4 12(27): 529-560. [Agapostemon angelicus Cockerell, 1924, Megachile albitarsis Cresson, 1872, Megachile discorhina Cockerell, 1924] https://biostor.org/reference/77990

Cockerell TDA (1924) A bee collecting trip to Chimney Rock, Wyoming. Entomological News 35: 347-350.

Cockerell TDA (1926) Descriptions and records of bees.—CXIII. Annals and Magazine of Natural History, Series 9 18(108): 621-627. [Anthidium tenuiflorae Cockerell, 1907] https://doi.org/10.1080/00222932608633558

Cockerell TDA (1927) Some North and South American bees. Annals of the Entomological Society of America 20(3): 393-400. https://doi.org/10.1093/aesa/20.3.393

Cockerell TDA (1927) Some bees, principally from Formosa and China. American Museum Novitates 274: 1-16.

Cockerell TDA (1928) A new bee of the genus Andrena visiting Senecio. Psyche 35: 62-63.

Cockerell TDA (1929) Some bees of the group Trachandrena, Robertson (Hymenoptera: Andrenidae). Annals of the Entomological Society of America 22(4): 754-758. https://doi.org/10.1093/aesa/22.4.754

Cockerell TDA (1929) New bees from the Mesa Verde National Park, Colorado. Journal of the New York Entomological Society 37(4): 441-448. http://www.jstor.org/stable/25004332

Cockerell TDA (1929) Descriptions and records of bees.—CXIX. Annals and Magazine of Natural History, Series 10 4(21): 296-304. https://doi.org/10.1080/00222932908673058

Cockerell TDA (1930) Descriptions and records of bees.—CXXI. Annals and Magazine of Natural History, Series 10 5(25): 108-115. https://doi.org/10.1080/00222933008673111

Cockerell TDA (1931) Some notes on bees of the genus Andrena. The Canadian Entomologist 63(1): 22-23. https://doi.org/10.4039/ent6322-1

Cockerell TDA (1931) Rocky Mountain bees. II. American Museum Novitates 458: 1-20.

Cockerell TDA (1931) A new bee of the genus Andrena from Canada. The Canadian Entomologist 63(9): 200-201. https://doi.org/10.4039/ent63200-9

Cockerell TDA (1932) Bees of the genus Andrena from California. The Pan-Pacific Entomologist 8(4): 173-177.

Cockerell TDA (1932) Two new bees of the genus Andrena from Canada. The Canadian Entomologist 64(7): 155-158. https://doi.org/10.4039/ent64155-7

Cockerell TDA (1932) A new Canadian Andrena (Hymenoptera, Apoidea). The Canadian Entomologist 64(12): 285-287. https://doi.org/10.4039/ent64285-12

Cockerell TDA (1933) Bees collected by Mrs. Maurice T. James in Pingree Park, Colorado. Annals of the Entomological Society of America 26(1): 40-44. https://doi.org/10.1093/aesa/26.1.40

Cockerell TDA (1934) New or little-known western bees. The Pan-Pacific Entomologist 9(4): 153-159.

Cockerell TDA (1934) Records of western bees. American Museum Novitates 697: 1-15.

Cockerell TDA (1936) Bees from Northern California. The Pan-Pacific Entomologist 12: 133-164.

Cockerell TDA (1936) The bees of Alberta.—I. The Canadian Entomologist 68(12): 274-277. [Osmia texana Cresson, 1872] https://doi.org/10.4039/ent68274-12

Cockerell TDA (1937) The bees of Alberta—IV. The Canadian Entomologist 69(5): 113-114. https://doi.org/10.4039/ent69113-5

Cockerell TDA (1937) Bees from San Miguel Island, California. The Pan-Pacific Entomologist 13(4): 148-157. [Anthidium palliventre Cresson, 1878]

Cockerell TDA (1937) Bees of Alberta. V. The Canadian Entomologist 69(6): 126-127. https://doi.org/10.4039/Ent69126-6

Cockerell TDA (1937) The bees of Alberta.—III. The Canadian Entomologist 69(4): 86-89. [Andrena milwaukeensis Graenicher, 1903] https://doi.org/10.4039/ent6986-4

Cockerell TDA (1938) The bees of Alberta VI. The Canadian Entomologist 70(1): 5-7. https://doi.org/10.4039/Ent705-1

Cockerell TDA (1938) Bees from Prince Albert Park, Saskatchewan. American Museum Novitates 983: 1-4.

Cockerell TDA (1938) The bees of Alberta VII. The Canadian Entomologist 70(4): 70-71. https://doi.org/10.4039/Ent7070-4

Cockerell TDA (1939) The bees of the southern California Islands. Proceedings of the California Academy of Sciences, Series 4 23(28): 427-436.

Cockerell TDA (1939) A new Colletes (Hymenoptera, Apoidea) found on Santa Catalina Island. The Pan-Pacific Entomologist 15: 188-189. [Colletes slevini Cockerell, 1925]

Cockerell TDA (1941) Observations on plants and insects in north-western Baja California, Mexico, with descriptions of new bees. Transactions of the San Diego Society of Natural History 9(31): 339-352.

Cockerell TDA, Casad JE (1895) Descriptions of new Hymenoptera. Transactions of the American Entomological Society 22(3): 297-300. http://www.jstor.org/stable/25076646

Coelho BW (2004) A review of the bee genus Augochlorella (Hymenoptera: Halictidae: Augochlorini). Systematic Entomology 29(3): 282-323. https://doi.org/10.1111/j.0307-6970.2004.00243.x

Crawford J (1911) Descriptions of new Hymenoptera. No. 3. Proceedings of the United States National Museum 41: 267-282.

Crawford JC (1901) North American bees of the genus Agapostemon Guerin. Publications of the Nebraska Academy of Sciences 7: 156-165. [Agapostemon femoratus Crawford, 1901, Agapostemon fasciatus Crawford, 1901, Agapostemon texanus Cresson, 1872, Agapostemon virescens (Fabricius, 1775), Agapostemon obliquus (Provancher, 1888)]

Crawford JC (1902) The bee genus Dialictus. The Canadian Entomologist 34(12): 318. https://doi.org/10.4039/ent34318-12

Crawford JC (1902) Notes and descriptions of bees. The Canadian Entomologist 34(9): 234-240. https://doi.org/10.4039/ent34234-9

Crawford JC (1904) Two new Halictus from New Jersey. Entomological News 15: 97-99.

Crawford JC (1906) Some new species of Halictus. The Canadian Entomologist 38: 4-6. https://doi.org/http://dx.doi.org/10.4039/Ent384-1

Crawford JC (1907) New Halictinae from the Western United States. Invertebrata Pacifica 1: 190-197. [Lasioglossum argemonis (Cockerell, 1897)]

Crawford JC (1913) Notes on somes species of the genus Prosopis. The Canadian Entomologist 45(5): 154-156. https://doi.org/10.4039/ent45154-5

Crawford JC (1932) New North American bees. Proceedings of the Entomological Society of Washington 34: 69-78. [Panurginus ineptus Cockerell, 1922, Epeolus ainsliei Crawford, 1932, Lasioglossum (Dialictus) abanci (Crawford, 1932), Perdita ainsliei Crawford, 1932, Protandrena illinoiensis (Cresson, 1878)]

Cresson ET (1868) Descriptions of North American Bees.—No. 1. Proceedings of the Boston Society of Natural History 12: 165-171. [Colletes albescens Cresson, 1868, Colletes americanus Cresson, 1868]

Cresson ET (1869) Descriptions of North American Bees.—No. 2. Proceedings of the Boston Society of Natural History 12: 269-274.

Cresson ET (1874) Descriptions of new Hymenoptera. Transactions of the American Entomological Society 5: 99-102.

Cresson ET (1875) Report upon the collections of Hymenoptera made in portions of Nevada, Utah, Colorado, New Mexico, and Arizona, during the years 1872, 1873, and 1874, with list of Formicidae by Edward Norton. Report upon Geographical and Geological Exploration and Surveys West of the One Hundredth Meridian 5: 707-736. [Melecta (Melecta) thoracica Cresson, 1875]

Cross EA (1958) A revision of the bees of the subgenus Epinomia in the new world. University of Kansas Science Bulletin 38: 1261-1301.

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