Robertson — Some Illinois Bees. 49 



convex, finely roughened, with rather large and sparse punc- 

 tures; process of labrum long, narrow; front below ocelli 

 finely striate ; facial grooves narrow, extending below anten- 

 nae, appearing fulvous; antennae black, short, joint three 

 longer than four and five together, these subequal ; meso- 

 notum and scutellum finely roughened, rather sparsely punc- 

 tured, not shining; metathorax rugose reticulated, inclosure 

 small, quite rough ; wings subhj^aline, ne» vures honey-yellow, 

 stigma darker, second submarginal cell about half as long as 

 third, receiving recurrent nervure just beyond middle; ab- 

 domen smooth, shining, almost impunctate, especially the 

 first segment, with thin pale pubescence, segments 2-4 with 

 narro v pale-testaceous margins and thin whitish fasciae, anal 

 fimbria blackish. Length 10 mm. 



Carlinville, Illinois; 2 5 specimens. This species also 

 resembles A. mandibular is. 



Andrena nasonii Rob. 



Andrena uaHonii Robertson, Trans. Am. Ent. Soc. 22 : 120. 9. 1895. 



$. — Closely resembles the female ; abdomen more shining, 

 pubescent fasciae almost obsolete; face narrow^ed below; 

 clypeus finely roughened, with rather coarse, shallow punc- 

 tures, bearded with long, thin, white pubescence; antennae 

 long, joint three about as long as four, shorter than ^yq. 

 Length 6-8 mm. 



Carlinville, Illinois ; 15 $, 4 ^^ specimens. • 



Andrena robertsonii D. T. 



Andrena serotina Robertson, Trans. Am. Ent. Soc. 20 : 148. ^ (notj^). 

 18'J3. 



(^. — Closely resembles the female ; abdomen less fasciate 

 with pubescent bands; clypeus yeUow; third joint of antennae 

 longer than fifth ; cheeks narrow, without obtuse angle ; sixth 

 ventral segment of abdomen with reflexed dentiform angles. 

 Length 7 mm. 



Carlinville, Illinois; 41 $, 7 ^ specimens. Resembles the 

 male of A. bipunctata, but may be readily distinguished by 

 its cheeks being more narrow, without obtuse angle, ni(;re 

 rugose inclosure of metathorax and dentiform reflexed angles 

 of sixth ventral segment. 



