324 THE CANADIAN ENTOMOLOGIST. 



£ . — Resembles the female ; pubescence nearly white throughout, 

 thin on mesonotum posteriorly and on scutel where it is sometimes a little 

 blackish ; clypeus, spot on base of mandibles and on labium white ; 

 antennae yellowish, darker above, joint 3 about twice as long as 2 ; wings 

 hyaline, nervure pale, much paler than in female ; segments of abdomen 

 with broad, pale, testaceous apical margins, 2-6 with submedian narrow, 

 arcuate, whitish pubescent fascia;, segments 5-7 with lateral spines. 

 Length, 13 mm. 



Carlinville, Illinois; 21 2, 156" specimens. 



The female gets her pollen exclusively from Vemonia fasciculata. 

 The male is quite while and resembles a large specimen of M. nivea. 



In my neighbourhood there are three species of bees which have been 

 referred to Xenoglossa. Melissodcs strenua, Cr., is evidently a true 

 Xenoglossa. It is proposed here to make Macrocera pruinosa, Say, the 

 type of a new genus, Peponapis, and X. ipomcece the type of a new genus, 

 Cemolobus. In its group Xenoglossa is remarkable for having the antenna* 

 of the male of the same form as in the female. In A', strenua the 

 secondary sexual characters are reduced to a minimum, the mandibles, 

 antennae and claws of the male being about the same as in the female, 

 and the clypeus of the female usually marked with yellow. The three 

 species may be separated as follows : 



Females. 



Claws with a short inner tooth, that of the hind claw about one-fourth 

 as long as the outer division ; clypeus trilobed ; mandibles with a 

 distinct exterior angle ; joint 2 of maxillary palpi nearly as long as 

 3-5, 4 nearly as long as 4+ 5 ; scopa nearly black ; abdomen nearly 

 black, with appressed glittering hairs ; first cubital cell shorter than 

 the third, hardly longer than the second C. ipomatce. 



Claws cleft, inner tooth of hind claw more than one-half as long as the 



outer division ; clypeus entire ; scopa ochraceous 1. 



1. Mandibles with an internal tooth at base ; maxillary palpi with joints 

 2-5 regularly diminishing in length ; abdomen with more or less 

 interrupted fascise of appressed ochraceous pubescence; cubital cell 

 1 a little shorter than 3. much longer than 2 X. strenua. 



Mandibles at apex bidentate ; joints 2 and 3 of maxillary palpi 

 subequal, 3 = 4+ 5 ; segments 2-4 of abdomen with whitish 

 pubescent fascia ; cubital cell 1 about as long as 3, twice as long 

 as 2 .... P' pruinosa. 



