2 PROCEEDINGS OF THE NATIONAL, MUSEUM. vol. 61. 



the larva beginning with a middorsal line and ending with a mid- 

 ventral line. These regions are named and defined as follows : 



I*. — Middorsal, a single, longitudinal midtergal line. 



I. — Dorsal, a pair of longitudinal tergal regions, one to each side 

 of the middorsal line. 



II. — Subdorsal, a pair of longitudinal tergal regions, one to each 

 side of the dorsal regions. 



III. — Laterodorsal. longitudinal regions, below tlie subdorsal re- 

 gions. 



IV. — Supraalar, regions, one on each side of larva below latero- 

 dorsal regions. 



V. — Alar, regions, one on each side of larva below the supraalar 

 regions and wherein the spiracle is situated on the lati'vae described 

 in the pi-esent paper. 



VI. — Epipleural, regions, below the alar. 



VII. — Pleural, regions, below the epipleural. 



VIII. — Hypopleural or lateroventral, paired regions, in which the 

 hypopleurites are situated one to either side of the sternum and be- 

 low the pleural regions. 



IX. — Adventral, paired longitudinal regions in whicli the uropods 

 protrude from the hypopleurites. 



X. — Ventral, a pair of longitudinal regions, one to either side of 

 the mid ventral line. 



X^. — Midventral, a single, midsternal longitudinal line. 



The rearinc: of the insects Avas done at the eastern field station of 

 the Bureau of Entomology, located at East Falls Church, Virginia, 

 and the paper prepared under the direction of Mr. S. A. Kohwer, 

 who has described the adults of such species as were new to science 

 and identified those adults previously described. 



The types of the larvae here described are in the collection of the 

 United States National Museimi. 



Family TENTHREDINIDAE. 



Subfamily Empriinae. 



Genus PERICLISTA Konow. 



The larvae of the two species described in this genus are readily 

 distinguished from each other in the arrangement of the spines and 

 from the other sawfly larvae on the character of their spines, the 

 larger of which are usually bifurcate and rarely trifurcate. 



PERICLISTA HICORIAE Rohwer. 



In Dyar's^ " Synopsis of the Larvae of the North American Blen- 

 nocampinae" the larva of this species falls in with {IsodycHum) 



"Xlyar, Journ. N. Y. Ent. Soc., vol. 6, June, 1898, p. 137. 



