no. 2064. BEES OF GENUS ANDRENA—VIEREGK AND COCKERELL. 41 



color. Abdomen shining, not punctured; hind margins of segments 

 broadly dark brown; second segment in middle depressed more than 

 one-third and less than one-half; hair at apex black. 



(This is named as a separate species, but I believe it to be the true 

 female of A. ribifloris. It is widely separated from female Tiemileuca 

 in the table.) 



Allotype.— Cat. No. 18144, U.S.N.M. 

 b m . Hair of thorax above pale ocherous. 



ANDRENA RIBIFLORIS, variety. 



Florissant, Colorado. June 16, 1907. At flowers of Ribes valli- 

 cola. (S. A. Rohwer.) 



Is identical with the insect just described, differing only in less 

 brightly colored hair of thorax above. 



The label states that it is a paratype, and that the type has fulvous 

 hair. 



Paratype.— Cat. No. 18144, U.S.N.M. 



o 66 . Basal part of abdomen without red or fulvous hair. 



a 57 . Second submarginal cell receives first recurrent nervure near end; clypeus with 

 a median ridge. 



ANDRENA RIBIFLORIS, new species. 



Colorado. 



Female. — Length, 10 mm., rather slender. Black, with black 

 pubescence on head, pale ferruginous on upper side of thorax but 

 sooty beneath, very dark brownish gray on legs and black at apex of 

 abdomen. Head broad; facial quadrangle much broader than long. 

 Process of labrum truncate. Mandibles red at extreme tip. Clypeus 

 dull at base and sides, but otherwise shining, with sparse punctures 

 and a median ridge. Front striate; facial foveae seen from above 

 chocolate color, occupying at least two-thirds of space between eye 

 and antenna, below they scarcely extend below level of antennae. 

 Antennae very dark, third joint longer than next two combined, but 

 not so long as next three. Mesothorax dull, with very minute feeble 

 punctures. Scutellum dull, shining in front. Area of metathorax 

 narrow, elongated apically with a few short basal ridges, the middle 

 one longer. Tegulae reddish. Wings reddish hyaline, nervures and 

 stigma ferruginous. Basal nervure not reaching transverse median. 

 Second submarginal cell large, receiving first recurrent nervure near 

 its end. Spurs very pale. Abdomen shining, entirely without hair 

 bands; without evident punctures. Segments broadly margined 

 posteriorly with dark brown, second segment in middle depressed 

 more than a third. Hair at apex of abdomen black. 



(A close study of this convinces me that it is A. ribifloris; it is hi bad 

 condition, and has lost part of its hair.) 



Paratype.— Cat. No. 18144, U.S.N.M. 



6 67 . Second submarginal cell receiving first recurrent nervure in middle; clypeus 

 with no distinct median ridge ; base of abdomen without long hair. 



