4 PROC. ENT. SOC. WASH., VOL. 21, NO. I, JAN., 1919 



Type and five paratypes mounted on card points and one 

 paratype on a slide. Also antennae and mandibles of a seventh 

 paratype mounted on a slide. All of these specimens were taken 

 in August, 1918, crawling over the body of what is believed to be 

 the prepupal larva of Epargyeus tityrus collected by Dr. W. M. 

 Mann. Although there is no positive proof to support the 

 assertion that the species is parasitic upon Epargyeus, it is 

 likely that these females were upon the caterpillar for the purpose 

 of ovipositing. 



DESCRIPTIONS OF THREE PARASITES OF AGRILUS ANGELICUS 



(HYM.). 



BY S. A. ROHWER, Bureau of Entomology. 



In a lot of Hymenopterous parasites of Agrilus angelicus Horn, 

 recently submitted by H. E. Burke, were three new species. As 

 it is desirable that their names be available, descriptions are 

 presented herewith. 



Genus Ptinobius Ashmead. 



The antenna of the species of this genus has never been de- 

 scribed and since they are unusual I take this opportunity to 

 publish a figure of the antenna of each sex. The terminal joint 

 is practically without sutures and the antenna appears to be 

 eleven-jointed. 



Key to the species. 



1. Propodeum covered with thimble-like punctures magnificus (Ashmead) 

 Propodeum smooth, polished 



2. Hind femora metallic; a dusky band below the marginal vein 



califoniicus Crawford. 



Hind femora mostly ferruginous; area below the marginal vein hy- 

 aline > 



2. Hind femora metallic; a dusky band below the marginal vein 



. . . . ; californicus Crawford. 



Hind femora mostly ferruginous; area below the marginal vein hy- 

 aline 



o. Ocellocular line half as long as the interocular line; lateral furrows 

 of propodeum foveolatc; area along median carina of propodeum 

 punctured; the spot below the end of submarginal vein joining the 

 band below the postmarginal vein .tcxuinis Crawford. 



Ocellocular line more than half as long as interocular line; lateral 

 furrows of propodeum not foveolate; area along median carina 

 smooth; spot below end of submarginal vein separated from the 

 band below the postmarginal ii^ri/i Rohwer. 



