18G4.] . 288 



yellowish-brown or obscurely honey-yellow, each segment having on its 

 disk at tip a transverse yellowish spot, very small on the first segment 

 and becoming larger towards the apex ; first segment slightly broader 

 at tip than at base, the lateral margins somewhat carinated and the 

 tubercles scarcely defined ; the second segment has on each side an 

 oblique well-impressed line, diverging from the basal middle to the late- 

 ral margin. Length 2-1 — 3 lines; expanse of wings 5 — 6 lines. 

 Hah. — Illinois. Dr. Samuel Lewis. 



.'!. Cteniscus orbitalis, n. sp. 



Fulvous; head large, white, vertex and occiput black; scutellum whitish; 

 wings hyaline, areolet oblique, petiolated ; abdomen subsessile, subclavate. 



MaLe. — Head large, nearly quadrate, black, the face, frontal orbits, 

 cheeks, clypeus, mandibles except tips, and the palpi pure white ; an- 

 tenna) nearly as long as the body, basal half blackish, apical half yel- 

 lowish, basal joint robust and piceous beneath. Thorax fulvous, pol- 

 ished, posterior margin of the mesothorax in front of scutellum, black- 

 ish ; tegulai, a sutural line before the wings and another down each 

 side of the pectus, whitish ; scutellum and postscutellum whitish, the 

 spaces on each side blackish ; metathorax entirely fulvous, the elevated 

 lines well defined, the central area moderate and elongate. Wings hya- 

 line, iridescent ; nervures and stigma fuscous, pale at base ; areolet 

 small, oblique and petiolated. Legs fulvous, the four anterior coxae 

 and trochanters whitish. Abdomen subsessile, subclavate, polished, 

 entirely fulvous, slightly dusky towards the tip. Length 3 lines ; ex- 

 panse of wings 6 lines. 



Hah. — Pennsylvania. E. T. Cressou. 



Readly distinguished by the large black and white head, the rest of 

 the body being fulvous. 



4. Cteniscus flavicoxae, n. sp. 



Black ; face, orbits, tegulse and coxse, yellow ; legs and abdomen, except base, 

 fulvous; wings hyaline ; areolet oblique, petiolated; abdomen subsessile. 



Female. — Head rather large, black, polished; face, except a dark 

 stain on its middle, frontal orbits, narrowed on each side of antennae, 

 cheeks beneath, clypeus, mandibles and palpi, pale yellow ; antennae as 

 long as the body, blackish, the apical third yellowish, the two basal 

 joints beneath yellow. Thorax black, polished; the tegulfe, a short 



