CIlALCIDIDyE. 



207 



<-<tinj>(t j Harris infests Clisiocampa. " Pternnniliis J,I/IH, is 

 parasitic in the nests of the Mason-bee." (AVestwood.) A spe- 

 cies of this or an allied genus (Fig. 139) 

 infests the eggs of the Clisiocampa Ameri- 

 cana. Its eggs are probably laid within 

 those of the Tent-caterpillar moth early 

 in the summer, hatching out in the autumn, 

 and late in the spring or early in June. 



An allied genus, ftiphonum, is a para- 

 site on galls. It resembles a beetle, Mor- 

 della, from its very peculiar scutum. Fi s- 1:J!) - 



The antennae of Semiotellus are twelve-jointed. S. (Ceraph- 

 roii) ih-xtriictor Say (Fig. 140), according to that author, 



destroys the Hessian-fly, while lying 

 in the "flax-seed" state. Fitch de- 

 scribes it as being a tenth of an 

 inch long, black, with a brassy 

 green reflection on the head and 

 thorax, while the legs and base of 

 the abdomen are yellowish. 



In Encyrtus, which comprises 

 over a hundred species already 

 known, usually rather small in 

 size, the body is short and rounded. 

 The eleven-jointed antennae are inserted near the mouth. The 

 thorax is square behind, and the sessile abdomen is short and 

 broad at the base. Encyrtus Bolx* 

 and E. Iteate are described from 

 North America by Mr. F. Walker, f 

 EiicyrtH* rariconu's is in Europe ^~ 

 found as a parasite in the cells of 

 Enmenes coarctata. 



The antenna? of Evlophns are nine- Fig- U1 



jointed, with a long branch attached to the third, fourth, and 

 tifth joints. The abdomen is flattened, sessile. E. 7>o.sv///.s- 

 Say was described from Indiana. We figure a Chalcid (Fig. 

 141, (?), allied to Eulopus, which preys upon the American 

 Tent Caterpillar. 



A species of Blastophaga (B. grossorum Grav.) is interest- 

 ing as it is the means of assisting in the fertilization of the Fig 



Fisr. 140. 



