258 [September 



and subrliomboidal. Wings hyaline, beautifully iridescent ; nervures 

 and stigma black, the former pale at base ; areolet minute, oblique and 

 petiolated. Legs pale rufous, the four anterior coxae and all the tro- 

 chanters whitish ; posterior coxoe and tarsi black, the latter whitish at 

 base, the posterior tibiae white with broad black band at tip and another 

 near the base. Abdomen elongate, slender at base, broad and com- 

 pressed at tip, the first segment slender at base, swollen and convex at 

 tip; apex of abdomen truncate, the ovipositor subexserted. Length 

 3 J lines; expanse of wings 5 J lines. 



//afe.— Canada West. Mr. B. Billings, Jr. 



Resembles M? validus, but is at once distinguished from that spe- 

 cies by the minute, petiolated areolet of the wings, by the more com- 

 pressed abdomen, the shorter ovipositor and the difi'erent coloration of 



the legs. 



This species makes an elongate-ovate cocoon, 4 lines long by l\ 

 wide, of a pure white color, with a rather broad black band near each end. 



3. Mesoleptusi validus, n. sp. 



Black: wings hyaline, areolet triangular; legs pale rufous, the posterior 

 tibia; and tarsi annulated with black and white ; basal segment of alidoinen 

 much dilated at tip. 



jT'emal,'. — Black, rather shining, robust, slightly pubescent; head 

 and antennc^ entirely black, the latter nearly as long as the body ; 

 teo-ulifi pale testaceous; metathorax sulcate behind and transversely 

 aciculate, the elevated lines distinct, the central area not defined. Wings 

 hyaline, nervures and stigma blackish, the former pale at base ; areolet 

 rather large, subtriangular, subpetiolated. Legs pale rufous, the four 

 anterior tibife and tarsi in front, yellowish-white ; posterior cox?e and 

 their trochanters above, black, their tibiae whitish with a broad black 

 annulus at tip and a narrow one near the base, their tarsi black with 

 the base of the first three joints whitish. Abdomen robust, subfusi- 

 form entirely black ; first segment slender at base and much dilated at 

 tip; apical segments broad and subcompressed ; ovipositor exserted 

 nearly the whole length of the body, piceous. Length 4 Unes ; ex- 

 panse of wings 6 lines. 



jj/a^e.— Resembles the female, except that the antennae are longer 

 and the abdomen subcylindric. 



Hab. — Pennsylvania. Mr. C. A. Blake. 



