fOO HYMENOPTERA. 



wings have a very short, bent costal (radial) vein. C. armoh 

 turn Say was described from Indiana. 



The egg-parasite, Teleas, has the elbowed twelve-jointed an- 

 tennae inserted very near the front of the head, and slightly 

 hairy and simple in the male, but in the female terminated in a 

 six-jointed club. The thorax is short, the legs thickened and 

 adapted for leaping, and the abdomen is pedicelled. Many 

 species have been found in P^urope. According to Westwood, 

 "the type of this genus is the Ichneumon ovulorum of Linnaeus 

 {Teleas Linncei Esenbeck), which Linnaeus and 

 D3 Geer obtained from the eggs of moths." It 

 has been raised from the eggs of several Bom- 

 hiicicla',. "Bouchs observed the female deposit 

 Fig. 134. ail egg in each of the eggs of a brood of Bom- 

 byx neustria. lie describes tlie larva as elliptical, white, 

 shilling, rugose, subincurved, and one-third of an inch long." 

 (Westwood.) 



Of the extensive genus Platygaster over a hundred European 

 species are already known. The body, especially the abdomen, 

 is generally flattened, the antennae are ten-jointed, and in the 

 female clavate. The wing veins are absent ; the rather slender 

 legs are not adapted for leaping, and the tarsi are five-jointed. 

 A species of Platygaster (Fig. lo-t) not 3'et named, oviposits 

 in the eggs of the Canker-worm moth, Anisopteryx A'ernata. 

 and by its numbers does much to check the increase of this 

 caterpillar. AVe have seen several of these minute insects 

 engaged in inserting their eggs into those of the Canker- 

 worm. 



Dr. Harris, in speaking of the enemies of the Ilessian-fly, 

 states, that "two more parasites, Avhicli Mr. Herrick has not 

 yet described, also destroy the Hessian-fly, while the latter is 

 in the flax-seed or pupa state. Mr. Herrick says, that the egg- 

 parasite of the Hessian-fly is a species of Platygaster, that it is 

 very abundant in the autumn, when it lays its own eggs, four 

 or five together, in a single cg^ of the Hessian-fly. This, it 

 appears, does not prevent the latter from hatching, but the 

 maggot of the Hessian-fly is unable to go through its trans- 

 formations, and dies after taking on the flax-seed form. Mean- 

 while its intestine foes are hatched, come to their growth, spin 



