616 ENTOMOLOGICAL NEWS. [December, 



Host. Odoii. : Eggs of Lcstcs sp. Bred August 12, 1899, 

 by Prof. James G. Needham. Evidently a hyper-parasite on 

 the Polyncma noted below. 



TETRASTICHUS Haliday. 



(2) Tetrastichus polynemae n. sp. 



9 . Length 1. 1 mm. Steel blue, impunctate ; abdomen, except at base, 

 aeneous ; scape, pedicel beneath and legs, except coxae and femora toward 

 base, yellowish or yellowish-white ; coxae metallic ; anterior and middle 

 femora tinged with brown, the hind femora brown ; flagellum brown pu- 

 bescent. Wings hyaline, pubescent, the veins very pale, the marginal 

 vein one-third longer than the subcostal. Abdomen pointed, ovate, about 

 one-fourth longer than the head and thorax united. 



Hab. L,ake Forest, Illinois. 



Type. Cat. No. 5323, U. S. N. M. 



Host. Odon. : Eggs of Lcstcs sp. Bred August 4, 1899, by 

 Prof. James G. Needham. Undoubtedly a hyper-parasite of 

 Polyncma ncedhami. 



FAMILY IvXXII TRICHOGRAMMID^. 

 BRACHISTA Haliday. 



(3) Brachista pallida n. sp. 



9 . Length 0.6 mm. Brownish-yellow ; the ocelli, the eyes, the sutures 

 of the mesopleura, a streak on hind coxae behind, and a row of dots along 

 the lateral margins of abdomen, brown ; while the legs, including the 

 coxae, except the streak behind, are very pale yellowish, nearly white. 

 Wings hyaline, pubescent, the hairs not arranged in rows, the margins 

 ciliate, the marginal vein strongly curved with the stigmal. Antennae 

 very short, 6-jointed, the flagellum with the pedicel not much longer than 

 the scape ; pedicel large, a little shorter but as thick as the club ; funicle 

 2-jointed, the joints small ; club fusiform, 3-jointed, brownish. Abdomen 

 sessile, pointed ovate, the ovipositor hardly projecting beyond the tip of 

 abdomen. 



Hab. L/ake Forest, Illinois. 

 Type. Cat. No. 5320, U. S. N. M. 



Host. Odon. : Eggs of Lcstcs sp. Bred August 12, 1900, 

 by Prof. James G. Needham. 



CENTROBIA Forster. 



(4) Centrobia odonatae n. sp. 



9. Length o.S mm. Black, slender, the abdomen much acuminate, 

 ending in a prominent ovipositor. Mouth parts brownish-yellow. An- 



