Andrena cressonii cressonii Robertson, 1891

Andrena Cressonii Robertson, 1891: 56 [♀, ♂].

     Lectotype ♀. USA, Illinois, Carlinville, 8 April 1888, by C. Robertson, on Stellaria media [INHS, Robertson no. 9067].

Andrena bridwelli Cockerell, 1899: 253 [♂]. Synonymy by Robertson (1902: 48); suggested by Lanham (1949: 211).

     Lectotype ♂, designated by LaBerge (1986: 527, by mention). USA, Kansas, Baldwin, April [no year provided], by J.C. Bridwell [USNM no. 4279].

Andrena dubia Robertson, 1902: 48 [♂]. Synonymy suggested by Lanham (1949: 211); P.H. Timberlake, in Linsley (1951: 1063).

     Lectotype ♂, designated by W.E. LaBerge, in Webb (1980: 106). USA, Illinois, Carlinville, 17 April 1888, by C. Robertson, on Salix cordata [INHS, Robertson no. 7165].

Andrena (Trachandrena) trumani Viereck and Cockerell, 1914: 12 [♀]. Synonymy by U.N. Lanham, in Linsley (1951: 1063).

     Holotype ♀. USA, South Dakota, Volga [ANSP no. 4083].

Andrena cressonii transformans Cockerell, 1933: 157 [♀]. Synonymy by P.H. Timberlake, in Linsley (1951: 1063).

     Holotype ♀. USA, Colorado, Boulder, 8 June 1933, by H.P. James [PHT].

Andrena (Opandrena) cressonii ivanensis Mitchell, 1960: 249 [♂]. Synonymy by LaBerge (1986: 526).

     Holotype ♂‚. USA, North Carolina, Ivanhoe, 5 April 1946, by T.B. Mitchell, on Padus [USNM no. 75175].

Andrena (Opandrena) cressonii tallahasensis Mitchell, 1960: 249 [♂]. Synonymy by LaBerge (1986: 527).

     Holotype ♂. USA, Florida, Tallahassee, 1 April 1944, by R. Bohart and G. Bohart [USNM].

Andrena (Opandrena) cressonii tallahassensis Krombein and Burks, 1967: 428. Emendation of Andrena (Opandrena) cressonii tallahasensis Mitchell, 1960. Synonymy by LaBerge (1986: 527).

Andrena (Opandrena) cressonii tallahasseensis LaBerge, 1986: 527 [Misspelling]. New Synonymy.

Taxonomic notes: Webb (1980: 106) indicates a collection date of 7 April 1890 for the lectotype of A. cressonii, differing from that reported by LaBerge (1986: 527); Robertson (1891) originally reported a date range from 5 April to 4 June [1890].

Distribution in Canada: Criddle et al. 1924 [ON, QC]; Knerer and Atwood 1964 [ON]; LaBerge 1985 [MB, QC, NS]; Sheffield et al. 2003 [NS], 2014 [MB]; Richards et al. 2011 [ON]; Normandin et al. 2017 [QC]; Gibbs et al. 2023 [MB].

Records of this species from BC by Viereck et al. (1904) and Criddle et al. (1924, also as A. trumani Viereck and Cockerell) are suspected of being A. cressonii infasciata Lanham, 1949.