28 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.48. 



The male of A. costiUensis resembles this as to bands, but the 

 elypeus is black, and the legs are not red. 



b 30 . Abdomen with weak bands or none. 



a 31 . At least the hind tarsi ferruginous (light brown in navajorum). 



a 32 . Abdomen without hair-bands; fiageilum bright red beneath; cheeks very broad. 



ANDRENA SUBAUSTRALIFORMIS, new species. 



Colorado. No. 2112. (Gillette.) 



Male. — Length, about 9 mm. Black; the tarsi bright ferruginous 

 and the flagellum except the first joint bright ferruginous beneath. 

 Pubescence pale ochreous, long on head and thorax. Head large 

 and broad, facial quadrangle much broader than long. Mandibles 

 long, curved downward, red at tip; process of labrum emarginate; 

 elypeus very finely punctured, almost hidden by long hair; sides of 

 front dull, finely striate; cheeks shining, very broad, obtusely angled 

 behind a little above the middle, but neither toothed nor with a sharp 

 marginal keel. Third antennal joint not much longer than fourth, 

 and only a trifle longer than fifth. Tegulae reddish; wings hyaline, 

 tinged with red, a little dusky apically, stigma and nervures clear 

 amber. Basal nervure meeting transverse median or falling a little 

 short of it. Second submarginal cell receiving first recurrent nervure 

 in middle. Sculpture of thorax essentially as in A. moesticolor. 

 Spurs ferruginous. Abdomen shining, without evident punctures, 

 hind margins of segments obscurely reddish in some lights. Second 

 segment in middle depressed less than one-third. A fine soft pubes- 

 cence all over segments but no hair bands. Apical plate narrow. 



This is easily distinguished from A. occidentialis by the structure 

 of the cheeks. 



Type.— Cat. In t o. 18140, U.S.N.M. 



o 32 . Abdomen with evident hair bands. 



a 33 . Flagellum bright ferruginous beneath; cheeks angled behind. 



ANDRENA CANADENSIS OSLARELLA, new subspecies. 



Denver, Colorado. 5562. (Oslar.) 



Male. — Length, 8 mm. Black, with ferruginous tarsi and the 

 flagellum light ferruginous beneath except at base. Pubescence gray- 

 ish white, not at all yellowish. Head very broad. Process of labrum 

 emarginate. Clypeus shining, with numerous minute punctures; no 

 smooth line or ridge. Third antennal joint a little shorter than the 

 next two combined. Cheeks broad, shining, angled behind, the angle 

 about level with middle of eye. Mesothorax and scutellum shining, 

 not evidently punctured. Area of metathorax dull and granular. 

 Tegulae rufotestaceous. Wings clear hyaline, slightly milky; stigma 

 and nervures ferruginous; stigma dusky margined. Basal nervure 

 falling a little short of transverse median. Second submarginal cell 

 receiving first recurrent nervure a little beyond middle or practically 



