8 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.48. 



following segments. Apical plate broadly truncate. (This is labeled 

 as a new variety of A. imitatrix. It is larger than A. crataegiphila, 

 with redder stigma and broader second submarginal, but I believe 

 certainly no more than a variation.) 



ANDRENA PROFUNDIFORMIS, new species. 



Fort Collins, Colorado. (Gillette.) October 5, 1901. 



Male. — Length 8 mm. Black, small j oints of tarsi light reddish ; first 

 two abdominal segments ferruginous at the extreme sides, the red area 

 of the second enclosing a black spot; hair very pale ochreous, long 

 on head and thorax; facial quadrangle broader than long; process of 

 labrum broadly truncate; clypeus closely punctured; malar space 

 short; cheeks normal; vertex depressed at sides; antenna black, 

 flagellum faintly brownish beneath. Third antennal joint distinctly 

 shorter than fourth, which is shorter than fifth. Mesothorax and 

 scutellum dullish, rather strongly punctured; mesothorax anteriorly 

 with three well marked longitudinal grooves. Metathorax rather 

 small, roughened, very hairy, the rather poorly defined area with 

 very strong longitudinal rugae, the three middle ones especially 

 prominent. Tegulae testaceous. Wing hyaline, faintly dusky. 

 Stigma reddish amber, nervures more fuscous, basal nervure meeting 

 transverse median. First recurrent nervure joining the rather large 

 second submarginal considerably beyond middle. 



Abdomen shining, feebly punctured, second segment in middle 

 depressed a little less than one-half, the depressed portions of the 

 segments obscurely reddish. Hair of abdomen short and sparse, 

 tending to form bands at sides of segments 2 and 4. 



Type.— Cat. No. 18126, U.S.N.M. 



This has darker hind tarsi than A. crataegiphila. In the table, the two species are 



separated thus: 



Second abdominal segment depressed decidedly less than one-half crataegiphila. 



Second abdominal segment depressed a little less than one-half profundiformis. 



o 9 . Stigma and nervures chestnut red; second submarginal cell receives first recur- 

 rent nervure near middle, or if beyond, not near end ; hind tarsi not clear red. 

 (The basal nervure meets, or almost meets, transverse median; in davisiana 

 it falls considerably short of it.) Species related to A. crataegi, but quite distinct. 



ANDRENA TACITULA Cockerel!. 



Boulder, Colorado. June 4, 1905. (W. P. Cockerell.) 

 Male. — Length about 7 mm. Black, with uniformly pale ochreous 

 hair. Facial quadrangle only a little broader than long. Process of 

 labrum broadly truncate. Clypeus shining, densely and strongly 

 punctured, with a delicate median raised line. Antennae dark, the 

 sutures between the joints deep, third joint short, about as long as 

 fourth. Vertex strongly punctured. Cheeks normal. Mesothorax 

 and scutellum shining, strongly punctured. Area of metathorax with 



