804 [September 



slender, piceous, basal joint black, 3rd joint longest, 4th and 5th sub- 

 equal, each one-third shorter than the 3rd, the joints distinct. Thorax : 

 mesothorax shining, closely punctured, the dorsal lines obsolete ; pleura 

 minutely rugose or striated; scutellum rather convex, punctured; me- 

 tathorax finely rugose, or somewhat reticulated, a well defined, trans- 

 verse, arcuated carina at base, and on side behind, an oblique, slightly 

 angular, well defined carina ; tegulae black. Wings pale fusco-hyaline, 

 slightly iridescent ; uervures and stigma black ; areolet large, subquad- 

 rate. Legs fuscous, their coxae black, the four anterior tibiae and tarsi 

 tinged in front with obscure yellowish. Abdomen very slender at base, 

 remaining segments together, oblong-ovate, polished, rufous, the 3 apical 

 segments black; basal segment long, arcuated, without lateral tuber- 

 cles; ovipositor about as long as the 1st segment of abdomen, rufous, 

 valves black. Length 2j lines; expanse of wings 4^ lines. 



Hah. — Illinois. Dr. Samuel Lewis. 



More slender than C. frater to which it is closely allied, but suffi- 

 ciently distinct. 



21. Cryptus extrematis, u. sp. 



Black ; anteiiuse with a broad white annulus ; legs and three basal segments 

 of abdomen rufous, large spot on the 6th or 7th segment and the posterior tarsi, 

 white; wings clear; ovipositor nearly as long as the abdomen. 



Female. — Black, shining, somewhat robust ; head short and broad ; 

 antennae as long as the body, slender, black, the 7tli to 12th joints 

 white, the 3rd and 4th joints long, the 3rd rather the longest, 5th a 

 little shorter than the 4th, and the fith about half as long as the 3rd. 

 Thorax finely punctured, the dorsal lines rather deep ; scutellum sub- 

 convex, polished ; metathorax finely scabrous, opaque, its base smoother 

 and shining, the elevated lines tolerably well defined, forming a large, 

 more or less distinct, subrhomboidal central area, lateral tubercles not 

 well defined. Wings faintly tinged with fuscous; uervures and stigma 

 blackish, pale at base; areolet large, subquadrate. Legs pale rufous, 

 the posterior femora and tibife at tips, and the base and apex of their 

 tarsi, blackish, rest of their tarsi white. Abdomen rather stout, subo- 

 vate, polished, rufous or yellowish-rufous; basal segment strongly ar- 

 cuated, broad at tip; the 4th and following joints black, the 6th or 7th 

 or both more or less white above ; ovipositor about as long as the body, 

 rufous, valves black. Length 4 — 5i lines ; expanse of wings 6 — 9^ lines. 



