no. 2064. BEES OF GENUS ANDRENA— YIERECK AND COGKERELL. 53 



light reddish, extremely narrow, ending below just below level of 



antennae. Antennae dark. Third joint not as long as next three 



combined; fourth and fifth very short. Mesothorax and scutellum 



shiny, with very fine punctures. Area of metathorax granular, not 



distinctly defined. Wings strongly reddish, nervures and stigma 



dark ferruginous. Basal nervure almost reaching transverse median. 



First recurrent nervure received by second submarginal cell a little 



before the middle. Hair of hind tibiae shining pale yellow. Abdomen 



shining, not distinctly punctured; segments 1 to 4 with conspicuous 



entire white hair bands. Hair at apex light reddish. 



In the key, this falls in a couplet with A. astragali, from which it is 



separated by the shining dorsulum. 



6 76 . Wings normal. 



a 77 . Second submarginal cell remarkably broad, broader than high, receiving first 



recurrent nervure about middle; stigma large; facial foveae light reddish, 



narrow. 



ANDRENA NIGRITARSIS, new species. 



Boulder, Colorado. May 27, 1906. (S. A. Kohwer.) 

 Female. — Length, 8 mm. Black, with light ocherous pubescence. 

 Facial quadrangle much broader than long. Process of labrum 

 small and broadly rounded. Clypeus shining, not densely punc- 

 tured, with no smooth fine or ridge. Facial foveae seen from above 

 light red, very narrow, ending below at about level of top of clypeus. 

 Flagellum dark red beneath except at base. Third antennal joint 

 scarcely as long as next two combined. Mesothorax dull, with feeble 

 minute punctures. Scutellum shining, with very sparse and small 

 punctures. Area of metathorax rather coarsely roughened. Tegulae 

 ferruginous. Wings reddish hyaline, nervures and the large stigma 

 ferruginous. Basal nervure falling a little short of transverse median. 

 Second submarginal cell very broad, with parallel sides, receiving 

 first recurrent nervure at or a little beyond the middle. Hair of hind 

 tibiae very pale ocherous or almost grayish white; on inner side of hind 

 tarsi golden. Abdomen shining, not punctured; hind margins of 

 second and following segments reddened; second segment in middle 

 depressed about two-fifths, but feebly. Rudimentary hair bands at 

 sides of second and following segments. Hair at apex light reddish. 

 Falls in key in the vicinity of A. melanochroa, A. apacJieorum, etc. 



o 77 . Second submarginal cell not formed as under a 77 . 

 a 78 . Facial foveae ochreous or reddish. 



a 79 . Basal nervure falling short of transverse median; hair of thorax grayish white; 

 species about 8 mm. long. 



ANDRENA COLORADINA, new species. 



Colorado. (C. F. Baker, No. 1900.) 



Female. — Length, 8 mm. Black, with pale grayish hair, that on 

 the scutellum slightly fulvous. Facial quadrangle broader than long. 



