332 Trails. Acad. Sci. of St. Louis. 



wings hyaline, nervures, stigma and tegulae exteriorly testa- 

 ceous; second sub marginal cell narrowed above, half as long as 

 third, or longer, receiving recurrent nervure at or before the 

 middle; legs blackish, more or less dull ferruginous towards 

 tips, scopa and floccus thin and whitish ; abdomen slightly 

 shining at base, finely roughened, almost impunctate, segments 

 with narrow pale testaceous margins, 2-4 with thin fasciae of 

 whitish pubescence, fimbria subfuscous. Length 7 mm. 



Carlinville, Illinois ; four § specimens. 



This species closely resembles the female of A. bipunctata 

 Cr. It may be distinguished by its clypeus not shining, 

 shorter antennae, wider second submarginal, inclosure of 

 metathorax less rugose at base, etc. 



Andrena platyparia Eob. 



Andrena serotina Robertson, Trans. Am. Ent. Soc. XX. 148, ^ (non. 9) 



1893. 

 Andrena platyparia Robertson, Trans. Am. Eat. Soc. XXII, 119, <^$, 



1895. 

 Andrena platyparia Rob., race occidentalis Cockerell, Ann. & Mag. Nat. 



Hist. 6, XVIII, 87, J 1 1896. 



The male was described from three specimens, which were 

 not sufficient for indicating the local variations and so formed 

 a poor basis for the foundation of a geographical race. I 

 now have eleven males. It is quite variable. Some specimens 

 show the legs quite black. Even the tarsi and antennae are 

 sometimes quite dark in Illinois and Long Island specimens. 



It may prove to be the same as A. fragilis Sm., but the 

 description of that species applies even better to A. salicis $, 

 and nearly as well to A. mandibularis g. 



Carlinville, Illinois, N. 111. (Nason), New Mexico (Cock- 

 erell), Long Island (Mrs. Slosson). 



Andrena robertsonii, D. T. 



Andrena serotina Robertson, Trans. Am. Ent. Soc. XX, 148, 9 (non. tf), 



1893 (nee Destefani). 

 Andrena robertsonii Dalla Torre, Cat. Hym. X, 149, 1896. 



Andrena mandibularis Rob. 



Andrena mandibularis Robertson, Am. Nat. XXVI, 272, J*, 1892. 



<j>. — Black, clothed quite evenly with thin ochraceous pubes- 

 cence, which is a little paler beneath ; head wider than thorax, 

 cheeks produced behind, but not to a salient angle as in the 



