144 E. T. CRESSON. 



9. torvinus, Cress. Trans. Am. Ent. Soc. i, p. 292, % . 



Ildb. — Illinois. A rather large dull black immaculate species with 

 narrow pale anuulus ou antennae and fuliginous wings. Length % 

 .70 inch. 



This and citimus may be sexes of the same species. 



10. citimus, n. sp. 



%■ — Deep black ; sides of face, dot on each side of clypeus, labrum, spot on 

 mandibles, palpi except base, scape beneath, narrow interrupted annulus on 

 middle of antennse and line on four anterior tibiae in front, white; antennae 

 long, slender at tips; thorax rather shining; disc of mesothorax sparsely punc- 

 tured; scutellum convex and strongly punctured; metathorax coarsely rugose, 

 excavated posteriorly, central area semicircular; wings blackish-fuliginous, 

 paler in middle of costal cells and at apex; legs slender; abdomen opaque, 

 rather shining at tip; apex of first segment moderately broad and coarsely 

 longitudinally aciculated, second and following segments confluently punc- 

 tured, gradually less strongly so towards apex, base of second longitudinally 

 rugose, gastrocoeli large and very deep. Length .TO inch. 



Hah. — White Mts., N. H., (Austin). Allied to torvinus, which has 

 much shorter antennae and the four anterior tibiae annulated at base 

 with white. 



11. centrator, Say, Am. Ent. pi. 22, 9. 

 fortis, Prov. Nat. Can. vii, p. 79, $ . 



Hah. — Can., Pa., N. C. A large dull black species, with dark fus- 

 cous wings and at once recognized by the reddish-brown head, meso- 

 thorax and scutellum; annulus on antennae very broad and yellowish. 

 Length 9 .70 inch. 



This is probably the 9 oi flavicornis. 



12. flavicomis, Cress. Proc. Ent. Soc. Phil, iii, p. 140, S . 



Hah. — Can., N. Y., Pa. A large dull black immaculate species, with 

 fulvous-yellow antennae and fuliginous wings. Length S .70 inch. 

 Probably the % of centrator. 



13. solitus, Cress. Proc. Cal. Acad. Nat. Sci. 1877, 9 . 



Ilah. — Colorado; Brit. Columbia. A small immaculate black species 

 with purplish-blue abdomen and smoky wings; pale annulus on an- 

 tennae rather narrow. The postpetiole is punctured, and gastrocoeli 

 small, punctiform. Length 9 .30 — .43 inch. 



14. scriptifrons, n. sp. 



S-— I^ull black; face more or less white, sometimes with only upper margin 

 irregularly white; clypeus sometimes with two oblique white marks ; antennae 

 with a white annulus; a short white line before tegulse; tegulte subconvex, 

 punctured; metathorax obliquely truncate behind, lateral angles spiniform, 

 central area small, semicircular or subquadrate; wings tinged with fuscous; 



