North American Hymenoptera. 



391 



Sc. Nat. torn, 4, p. 335,) which I find it closely resem- 

 bles, and to which I should refer it, but for the character 

 attributed to that insect of having only the " bord poste- 

 rieur des cinq premiers anneaux de I'abdomen jaune/' 

 whilst all the segments of the tergum of our species are 

 margined with yellow, and the anal segment is also of that 

 color, in all the specimens which I have seen ; all the 

 segments of the venter, moreover, are margined with the 

 same color excepting the basal one. These differences 

 induce me not to withhold this description, as we may 

 reasonably infer that others exist, which can be detected 

 only by comparison. Whether this species is the artificer 

 of either of the nests figured by Hernandez and copied by 

 Latreille in Humboldt's Zoology, I cannot positively de- 

 terniine, but it seems highly probable. The observation 

 of Latreille relative to the insects^ that construct those 

 nests, (or at least one of them, for they ar^ very unlike 

 each other) seems judicious, that " j'ai lieu de soupgonner 

 que ces insectes sont identique ou peu diffetens," from 

 his P. lecheguana. 



^>} 



■V 



CoLLETEs, Latr. Klug. 



r 



f r 



V 



C. incBqualis. Labrum with four indentations near the 



base. 



Inhab. Indiana. 



$ Body black with pale cinereous hair : labrum on the 



basal half. 



orax 



nervures 



fuscous : tergum with very short dusky hair ; that of the 

 anterior portion of the basal segment, and on each side 



'X 



and 



posterior margins of the segments with white hair, beneath 



