NO.20G4. BEES OF GENUS ANDRENA—VIERECK AND COGKERELL. 21 



on hind tibiae and on tarsi, which are ferruginous. Hair on hind knees 

 red. Head oblong, face narrower than in male, facial quadrangle 

 much longer than broad, the wholly black clypeus convex, prominent, 

 shining, with scattered punctures. Third antennal joint nearly twice 

 as long as fourth; fifth no longer than fourth. Facial foveae seen 

 from above pale yellowish, occupying less than half space between 

 antenna and eye; below they narrow, ending a short distance from 

 orbital margin a little below level of antennae. First abdominal seg- 

 ment without hair bands; second to fourth with dense and con- 

 spicuous creamy white bands, that on second narrowly interrupted in 

 middle. Fifth segment and apex with light red hair, having a sort 

 of apricot tint. 



In the key, this falls in the group of A. bradleyi, from which it is 

 separated thus: 



Females: 



Inclosure of metathorax appearing reticulate owing to the presence of crooked 



plicae; caudal fimbria brown bradleyi. 



Inclosure granular ; fimbria golden cheyennorum. 



Males: 



Tarsi blackish bradleyi. 



Tarsi stramineous cheyennorum. 



The light tarsi also separate cheyennorum at once from A. saccharina Cockerell and 

 Rohwer. 



o 19 . Clypeus and lateral face-marks light. 



a 22 . Lateral face-marks large, filling space between clypeus and eye. 

 a 23 . Flagellum dull red beneath ; the small triangular area of metathorax conspicuous 

 because bounded by pale hair. 



ANDRENA MOQUIORUM, new species. 



Flagstaff, Arizona. August, 1902. (Snow, No. 339.) 

 Male. — Length, 9 mm. Black, the legs and abdomen very dark 

 rufofuscous; clypeus, a triangular supra-clypeal mark and large, 

 nearly equilateral lateral areas cream color. Head very broad; 

 mandibles long and slender, simple; malar space hardly developed; 

 process of labrum narrow, rounded, prominent. Pubescence rather 

 dull white, very faintly tinged with ocherous on thorax above. Cly- 

 peus feebly punctured; cheeks broad, angled below; flagellum dull 

 pale reddish beneath. Third antennal joint about twice as long as 

 fourth, and distinctly longer than fifth. Mesothorax dullish, with 

 very minute inconspicuous punctures. Metathorax small, the tri- 

 angular basal area defined only by absence of hair, its basal middle 

 with slight rudimentary plicae. Tegulae shining brown. Wings 

 hyaline, dusky apically; the nervures and rather small stigma dark 

 reddish. Basal nervure falling a considerable distance short of trans- 

 verse median. Second submarginal cell large, receiving first recur- 

 rent nervure well beyond middle. Spurs pallid. Abdomen shining, 

 feebly punctured; hind margins of segments with dense rather 



