756 BOSTON JOURNAL 



tween the recurrent nervures at their entrance into the second 

 cubital, and by the more wrinkled mctathorax. 



TRYPOXYLON F. Latr. 



1. T. POLITUS. — Black; very highly polished: without any 

 Bilvery 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. Ji<julus F., but the ba- 

 sal joint is rather abruptly slender on its basal half; this segment 

 has an abbreviated, impressed, longitudinal line before its tip ; 

 second sesrment with a similar line before its middle : on the 

 head and stethidium are very numerous, small punctures, but 

 none on the abdomen : posterior tarai white, first joint at base, 

 and pulvilli blackish. 



Inhabits Indiana. 



Length nine-tenths of an inch. 



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

 ably the alhitarsa Beauvois, 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 out two species from North America. For 

 these reasons I have been led to consider the alhitarsa F. as 

 South American ; and as Latreille says that every thirty degrees 

 of latitude exhibits a total change [374] in the insect productions, 

 I give a new name to this species. 



2. T. CLAVATUS. — Abdomen at base slender and a little nodu- 

 lous ; wings at tip dusky. 



Inhabits United States. 



Body black ; head and stethidium with silvery reflection : wings 

 hyaline, terminal margin dusky : abdomen clavate : the first and 

 second joints petioliform, a little nodulous at their tips : posteri- 

 or tarsi white ; the terminal joint and base of the first joint black ; 

 % with a spine on the posterior trochanter. 



Length about nine-twentieths of an inch, 



[Vol. I. 



