no. 2064. BEES OF GENUS ANDRENA—VIEREGK AND COGKERELL. 35 



of A. atala falls with fernaldiella, and is found on comparison to be 

 nearly the same, but the color of the pubescence is different, and the 

 stigma is much darker. I think they are distinct species. A. fer- 

 naldiella occurs at Salix, but A. atala at Polemonium.) 



o 36 . Sides of front without black hair. 



a 43 . Comparatively large species, with large heads. 



a 44 . Cheeks in lateral outline gently rounded, their surface granular. 



ANDRENA INTERROGATIONS, new species. 



Colorado. (C. F. Baker, No. 1858.) 



Male. — Length, 10 J mm. Black, the tarsi red at apex. Hair 

 grayish white, slightly yellowish on thorax above, a little black at 

 sides of front. Head very large and broad, but the swollen cheeks are 

 neither angled nor sharply margined behind, their surface is dullish 

 except just behind the eyes. Facial quadrangle very much broader 

 than long. Mandibles long but moderately stout. Labrum shining, 

 triangular, without an evident process. Clypeus granular, sides of face 

 dull with sparse weak punctures, the punctures stronger below. Long 

 dark hairs at extreme sides of face. Antennae slender, flagellem dark 

 brownish beneath. Thud antennal joint relatively short and broad, 

 hardly longer than fourth and distinctly shorter than fifth. Meso- 

 thorax dull, feebly punctured. Scutellum shining in front. Area of 

 metathorax slightly irregularly wrinkled at base. Tegulae piceous. 

 Wings brownish hyaline, nervures and stigma ferruginous. Basal 

 nervure falling just short of transverse median. Second submarginal 

 cell large, receiving first recurrent nervure well beyond middle. Third 

 submarginal very broad above. Spurs pallid. Abdomen broad, 

 moderately shining, with minute feeble punctures; the segments 

 pruinose with short pale hair, but without bands; second segment in 

 middle depressed about one-third. Apical plate large, rounded, but 

 with parallel sides. 



Type- -Cat. No. 18147, U.S.N.M. 



In the key this falls near A. micranthophila, differing by the mostly 

 pale hair of head. 



o 44 . Cheeks in lateral outline angled, and concave just below the angle. 

 ANDRENA OCCIDENTALIS (Cockerell), variety A. 



Sapello Canyon, New Mexico. July 28, 1902. (Oslar.) 

 Male. — Length, 9 mm. Black, small joints of tarsi reddish. 

 Pubescence ocherous, only moderately dense, but long on head and 

 thorax. Head very large and broad, the eyes converging above, 

 facial quadrangle very much longer than broad. Vertex seen from 

 in front elevated, straight, showing in profile an angle above each 

 eye; cheeks swollen, smooth and shining, extremely broad, obtusely 

 angled behind near middle and with posterior edge bounded by a 



