32 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.48. 



shining, without evident punctures; hind margin of first segment 

 narrowly and the following ones broadly dark red; second segment 

 in middle depressed more than one third. No hair bands. Apical 

 plate large, emarginate. 



Type— Cat. No. 18143, U.S.N.M. 



In the key this falls near A. mentzeliae, from which it is separated 

 by its smaller size. Recently (June 25, 1913) both sexes have 

 been found at Longs Peak Inn, Colorado, visiting flowers of PotentiUa 

 (T. D. A. and W. P. Cockerell). The female is remarkable for the 

 short hair on the hind tibia. It resembles A. birtwelli in appearance. 



6 40 . Pubescence ochreous; cheeks not angled- tub erculate behind in the type, but 

 this character seems variable ; scutellum brilliantly shining anteriorly. 



ANDRENA RTBIFLORIS, new species. 



Florissant, Colorado. (S. A. Rohwer.) At flowers of Ribes vol- 

 licoU. June 19, 1907. 



Male. — 9 mm. long, slender. Black, with pale pubescence, which 

 is distinctly ochreous on thorax above, more or less fuscous on scape 

 and at sides of face. Head broad, eyes approximately parallel. 

 Facial quadrangle much broader than long. Process of labrum 

 broad, truncate. Mandibles red at apex. Malar space rather large. 

 Clypeus shining, with sparse small punctures. Front minutely stri- 

 ate; cheeks broad, shining, with a distinct angle between cheeks and 

 occiput. Antennae long, flagellum brown beneath. Third antennal 

 joint hardly longer than fourth and not as long as fifth. Meso tho- 

 rax minutely grandular, dullish except posteriorly; scutellum bril- 

 liantly shining; area of metathorax dull and granular. Tegulae 

 reddish brown. Wings hyaline, faintly brownish apically; stigma 

 and nervures dark amber color. Basal nervure falling a considerable 

 distance short of transverse median. Second submarginal cell broad, 

 receiving first recurrent nervure near beginning of its last third. 

 Third submarginal long. Tarsi reddish. Abdomen shining, without 

 evident punctures, and with scanty short hair not forming distinct 

 bands. Hind margins of segments dark reddish. Second segment 

 in middle depressed hardly one-fourth. Hair about apex of abdomen 

 with golden tints. Apical plate very small and narrow, truncate. 



Readily distinguished from A. polygoni by the colors, the venation 

 and the broad head. 



Type.— Cat. No. 18144, U.S.N.M. 



In the key, this falls in a couplet with A. distans, and is separated 

 as follows : 



Clypeus dull, vertex without blackish hairs distans. 



Clypeus shining, vertex with some blackish hairs ribifloris. 



(When I examined seven males collected by Mr. S. A. Rohwer at 

 Florissant, June 12-19, six at Ribes vallicola, one at Ribes longiflorum, 



