FAMILY CHALCIDIM. 
Subfamily LEUCOSPIX^. 
Genus Leucospis Fabr. 
In this genus the fore wings are folded as with the true wasps, the hind femora 
are greatly thickened, the tibiae are broadened at their extremities, and the ovipos- 
itor of the female is curled up over the dorsum of the abdomen, usually reaching to 
the thorax. 
1. LeucoBpis affinis Say. 
This species is represented by two $ specimens taken in Northern 
Virginia in September. It is a common species, found from Canada to 
Texas, and is supposed to live in the nests of wild bees. [0. V. R. 
Coll.] 
Subfamily CHALCIDD^E. 
The three genera which we shall consider in this subfamily may be 
separated as follows : 
A. Abdomen petiolated Spilochalcis. 
B. Abdomen sessile. 
a. Posterior tibia produced to a single spine at tip. Antennae inserted at the 
middle of the face Cham is. 
b. Posterior tibia two-spined. Antennas inserted below the middle of the tare. 
Haltichki i. a. 
Note. — In this first paper on the Chalcididffi in the collection of the United States 
Department of Agriculture and that of Dr. C. V. Riley, which has been constantly 
used in the work of the Department, I have taken op the six subfamilies LsMCOtptiMV, 
Chalcidimr, EnoyrtitUB, AphelinincB, Elaohistinas, and Elasmina. In numbers these sub- 
families are not Largely represented, but the material is mainly undescribed and is 
rendered valuable by the accompanying notes on habits and dates Of issuance, which 
are connected with numbers in the collections. The hosts not specifically referred to 
are undetermined by l>r. Riley, and are, so far as known, undescribed. 
L. 0. HOWARD. 
January 1, 1885, 
