NORTH AMERICAN HYMENOPTERA. 119 



men more shining, less pubescent, and the hist segment beneath 

 provided with a conspicuous tuft of liair. 



Aiidrcna erigeiiite Rob., ibid. 52. 



The abdomen of the male terminates in a strongly forked process, 

 each division of the process being quite slender and pointed. 



Audreua gerauii Eob., ibid. 54. 



This species is often quite blue, but is sometimes quite black, 

 without any metallic reflection. 



Audreua pulcliella Rub., ibid. 57. 



The male of this species closely resembles the female. Besides 

 the large spot on each side of the face, which also occurs in the 9 , 

 the clypeus also is yellow, except two spots on the disc, and the an- 

 terior margin. The labrum has a strong process, which, from in 

 front, appears strongly bidentate ; apex of tibise and tarsi yellow 

 testaceous. 



Audreua alicia; Rob., ibid. 57. 



This was described from a single female specimen. I now have 

 nine females agreeing with the type. The male agrees with the 

 female, exce[)t in characters peculiar to the sex. This is the only 

 Andrena known to me in which the female has the clypeus yellow, 

 the same as in the male. 



Audreua serotiua Rob., Trans. Am. Eut. Soc xx, 148. 



The insect described as the male of this species does not belong 

 to it, but is the male of the next. 



Auflreua platyparia 9. Black; head large, slightly broader than tho- 

 rax ; cl.ypeus moderately convex, rather closely and strongly punctured on the 

 sides, apical border somewhat reflexed, with lateral angles prominent ; basal jjro- 

 cess of labrum quite prominent, long, narrowed towards base, or subquadrate and 

 concave in front : third joint of antennai about equal in length to fourth and 

 fifth together; cheeks strongly and broadly produced beliind eyes, bordered by a 

 more or less evident rim ; disc of mesothorax with rather shallow, sparse punc- 

 tures, clothed with thin, pale pubescence ; scutellum almost inipuuctate, shining ; 

 disc of metathorax with the enclosure rather strongly reticulated. Wings slightly 

 clouded, nervures testaceous, stigma often with fuscous spot, tegulfe with testa- 

 ceous spot. Abdomen shining and almost impunctate on tirst segment, elsewhere 

 with fine, sparee punctures and short, sjiarse pubescence ; segments 2-4 witli nar- 

 row, white, apical fasciie, more or less interrupted on second, anal fimbria fulvous. 

 Legs with the pubescence inclining to ochraceous, especially the scopaj, floccus 

 white, apical joints of tarsi ferruginous. Length 8-9 mm. 



'J, = ^. seroHua Rob. % . 



Hah. — Illinois ; nineteen female specimens. 



TRANS. AM. ENT. SOC. XXII. MAY, 1895. 



