40 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 48. 



and scutellum dull and granular. Area of metathorax poorly de- 

 fined, granular. Hair of thorax above anteriorly almost white, but 

 on scutellum becoming pale fulvous; grayish white on sides of meta- 

 thorax, but black on pleura. Tegulae piceous. Wings dusky hya- 

 line, nervures and stigma dark reddish. Basal nervure meeting 

 transverse median. Second submarginal cell receiving first recur- 

 rent nervure at beginning of last third. Hair of hind femora and 

 tibiae beneath glistening white, but of hind knees and hinc^ tibiae 

 above gray, on inner side of hind tarsi pale reddish; anterior femora 

 behind with long sooty hair. Abdomen shining, without distinct 

 punctures, the broad hind margins of segments dark reddish; first 

 two abdominal segments with long white hair, the others with long 

 sooty hair, some pale hair on hind margin of third. No distinct 

 bands. 



A. pyrrliacita coloradensis and A. bebbiana are very closely allied, 

 but differ in the process of labrum, and appear to be distinct species. 

 A. bebbiana is very close to A. ribesina Cockerell, but is distinct by 

 the entirely purplish-black hair of face and cheeks, etc. 



ft 51 . Not as under a 6l . 



a 53 . Rather small species, about 9-10 mm. long, superficially all much alike, without 



even rudimentary light hair hands on abdomen. Hair of thorax above ochreous 



or fulvous. Hair of cheeks black. 

 a 54 . Abdomen purple. 



(See A. purpurina, above.) 

 6 54 . Abdomen black; hair of face black. 

 a 65 . Basal part of abdomen with red or fulvous hair. 

 a £6 . Hair of thorax above bright fox red. 



ANDRENA RIBIFLORIS, new species. 



Colorado. 



Female. — Length, 9 mm. Black; thorax above and tubercles with 

 very bright fox-red hair, vertex with pale reddish hair, otherwise 

 the hair of head and thorax is hlack, except that at sides of meta- 

 thorax and a little at upper end of pleura is red. Hair of legs black, 

 pale reddish on anterior tarsi, and whitish with a smoky tinge on 

 hind femora. First abdominal segment and basal half of second 

 with long red hair, rest of abdomen with scanty short black hair. 

 Facial quadrangle broader than long. Process of labrum emargi- 

 nate. Clypeus with strong not very dense punctures. Facial foveae 

 seen from above dark brownish gray, occupying about three-fourths 

 space between eye and antenna, but narrowing below and ending a 

 little below level of antenna. Antennae dark, rather slender. Third 

 joint a little longer than next two combined. Mesothorax dull, 

 hardly punctured. Area of metathorax with short feeble ridges at 

 base. Tegulae dark reddish. Wings hyaline, faintly dusky, more 

 dusky at apex. Stigma and nervures dull ferruginous. Basal ner- 

 vure falling short of transverse median. Second submarginal cell 

 receiving first recurrent nervure very near its end. Spurs cream 



