Descriptions of New Parasitic Hymenoptera. 



53 



but widening, the last funiclar joint being transverse ; club 

 stout, fusiform, 3-jointed. Thorax with the parapsidal furrows 

 indicated only anteriorly for two-thirds the length of the 

 mesonotum, entirely wanting on the posterior one-third; 

 metanotum produced at apex and covering the short petiole 

 of abdomen, the nucha distinct, the spiracles ellipsoidal, the 

 superior margin of the metapleura covered with whitish 

 hairs; wings hyaline, pubescent, the venation pallid, the mar- 

 ginal vein about two-thirds the length of the submarginal, the 

 post-marginal a little longer than the stigmal, the latter end- 

 ing in a small stigma ; legs as in Pteromahis. 



Abdomen ovate, subsessile, shaped as in P. pup arum Linn.; 

 first bod}' segment the longest, the second and third about 

 equal, together not longer than the first, the fourth shorter 

 than the fifth. 



Male — Length, 2 mm. Agrees with the female in color, 

 except the flagellum is beautifully banded with white and 

 brown, each alternate joint being contracted; the abdomen is 

 brownish-yellow, except toward apex above ; while the legs, 

 including all coxae, are yellowish-white. 



The legs are of a peculiar structure, closely resembling 

 those found in the genus Platymesopus Westwood. 



The anterior tibiae are subclavate, while the middle tibiae 

 are clavate with the outer edge much dilated, forming toward 

 apex a leaf-like expansion, which is fuscous. 



Hab. — Lafayette, Indiana. 



Described from several specimens in both sexes, bred by 

 Prof. F. M. Webster, from galls of Aulax sp. 



This is the first species of this genus to be described in our 

 fauna, the others being found in Sweden. The male, with its 

 banded white and brown antennae, is truly a lovely little 

 chalcid. Nothing is known of the habits of the two European 

 species. 



Sub-family Entedonin^e. 



Chrysocharis Forster. 



(12) Chrysocharis compressicornis, sp. n. Female — 

 Length 2 mm. Head and thorax squameous, blue with a green- 



