^ 



f.f 



North American Hymcnojpicra. 



373 



1 



Resembles caViytcra^ but may be distinguished by the 

 greater width of the third cubital cellule ; by the greater 



ervures 



into the second cubital, and by the more wrinkled meta- 



thorax. 



1 



i 9 



mi 



Trypoxylon, F. Latr- 



1. T. politus. Black; very highly polished ; without 

 any silvery reflection ; thorax and scutel with a slightly 

 Impressed; longitudinal line : wings black-purple, almost 

 opake : abdomen rather less slender at base than that of 

 T.jigulusy F. but the basal joint is rather abruptly slender 

 on its basal half; this segment has an abbreviated, im- 

 pressed, longitudinal line before its tip ; second segment 

 with a similar line before its middle : on the head and 



4 



stethidium are very numerous, small punctures, but none 



on the abdomen : posterior tarsi white, first joint at base, 

 and pul villi blackish. 



Inhab. Indiana. 



Length nine tenths of an inch. 



Judging by memory, as I have not his work here, this 

 is probably the albiidrsay Beau vols, but although it agrees 

 with the short description of Fabricius, yet I greatly doubt 

 if it is the alhitarsa of this author, who gives its native 

 country as South America, on the authority of Mr. Smith 

 and of the Museum of Mr. Lund, from whom and from 

 Mr. Sebestedt he obtained an opportunity to describe a 

 great number of Hymenoptera of that portion of our 

 hemisphere ; and but two species from North America. 

 For these reasons I have been led to consider the alhi- 

 tarsa^ F. as South American ; and as Latreille says that 

 every thirty degrees of latitude exhibits a total change 



\ 



