Dufourea dilatipes Bohart, 1948

Dufourea dilatipes Bohart, 1948: 135 [♂‚ ♀].

     Holotype ♂. USA, Montana, Glacier National Park, Two Medicine Lodge, 6 July 1938, by E.C. Van Dyke [CAS no. 5983].

Taxonomic Notes: Bohart (1948: 136) did not clearly indicate the sex of the holotype, as the material from the type location includes five additional specimens.

DNA Barcode Index Number (BIN): BOLD:AAE7949

Diagnosis: Dufourea dilatipes can be distinguished from other species of Dufourea in Canada except D. maura by the combination of the robust brown to black body (D. holocyanea (Cockerell) has metallic blue integument) with brown pubescence, including the tibial scopa, and a head which is much broader than long in both sexes. The female of D. dilatipes differs from D. maura by the metapostnotum being weakly striate, and the scutellum moderately to densely punctate throughout in D. dilatipes, but the metapostnotum shiny, with deep striations in D. maura, with the scutellum with large, shiny, impunctate areas. The male of D. dilatipes has a robust hind femur (1/2 as broad as long) without a basal spine, and hind tibia which is widened apically (appearing triangular), while the hind femur of D. maura is much longer than wide with a distinct basal spine, and a hind tibia that is smoothly expanded and widest about 2/3 of the way to apex.

Biology: Dufourea dilatipes is considered oligolectic on Mariposa Lilies (Calochortus, Liliaceae). Lincoln (1981) reported D. dilatipes Bohart on both Calochortus and Campanula (Campanulaceae) in Canada, but the latter record may actually be based on misidentification specimens of D. maura (Cresson) as one of the two pollen samples examined was from Ontario (see Lincoln 1981), far outside the known range of D. dilatipes (see Dumesh and Sheffield 2012). In Canada, Calochortus is restricted to southern AB (Waterton Lakes area - one species, C. apiculatus) and southrn BC.

Distribution in Canada: Bohart 1948 [AB]; Dumesh and Sheffield 2012 [AB; BC suggested but no data to support it]; Sheffield et al. 2014 [AB]; Sheffield and Heron 2019 [BC].