AMERICAN HYMENOPTERA. 151 



42. atrox, n. sp. 



9. — Robust, black, opaque, mesothorax, scutellum and apex of abdomen 

 shining; annulus on antennre, scutellum, anterior tibise, intermediate pair 

 except tip, broad anuulus on posterior pair, and spot on middle of two apical 

 segments of abdomen, white; antennae short, stout, strongly involute, third 

 joint not twice longer than broad and longer than fourth which is nearly 

 quadrate, apical joints attenuated; upper anterior orbits narrowly reddish; 

 mesothorax confluently punctured; scutellum broad, flat, polished, impunc- 

 tured, apex truncate; metathorax opaque, rugose, posterior face rather deeply 

 excavated, lateral carina prominent, central area large, quadrate; wings uni- 

 formly brown, stigma yellowish-brown, nervures black; legs rather robust, 

 four anterior tarsi more or less brown, posterior coxae pubescent beneath, but 

 without a distinct scopa; abdomen clougate-ovate or broadly fusiform; first 

 segment rather broadly dilated at tip and longitudinally aciculated; second 

 and third segments closely punctured, strongly so at base of second and more 

 feebly on third and following segments; gastrocoeli moderately large and deep. 

 Length .70 inch. 



Hub. — Canada. A very distinct species. 



43. stygicus. 



siffuafipes, Prov. (nee Cress.), Nat. Can. vii, p. 52, 9 . 

 Hab. — Can.. Mass. This is a robust black species with smoky hya- 

 line wings; annulus on antennae, scutellum, annulus at base of all the 

 tibiae, and spot at apex of abdomen, white ; the coxal scopa distinct. 

 Length 9 .50 inch. 



44. pilosulus, Prov. Nat. Can. vii, p. 25, 9 . 



Hub. — Can., Mass. A subrob'ust black species, with no other 

 markings except a white annulus on flagellum and a white spot near 

 base of all the tibiaj; wings clear; postpetiole narrow, punctured; 

 gastrocoeli subobsolete, feebly indicated, second and base of third 

 segments closely punctured, remainder impunctured, shining. Length 

 9 .45 inch. 



45. pravus, n. sp. 



9. — Dull black, mesothorax, scutellum and apex of abdomen shining; upper 

 anterior orbits, palpi, narrow annulus on antennre, narrow upper margin of pro- 

 thorax, sometimes interrupted spot beneath tegulse, sometimes apex of scutellum 

 and elongate spot on outer side of all the tibire, white; clypeus and mandibles 

 more or less tinged with ferruginous; antenna; short, stout, with short robust 

 joints, third and fourth joints equal in length and each about one and a half 

 times longer than wide; mesothorax and scutellum si)arsely punctured and 

 polished, the latter flat and broadly rounded behind ; metathorax opaque, 

 scabrous, posterior face deeply excavated, lateral angles prominent, central 

 area elongate subquadrate, rounded anteriorly; wings faintly tinged with 

 brown; legs short, robust, femora swollen, tips of anterior femora, their tibife 

 and tarsi tinged with ferruginous, posterior coxte beneath nude, sparsely punc- 

 tured ; abdomen oblong-ovate; first segment rather broadly dilated at apex, 

 with the surface even and finely roughened; second segment closely and finely 



