AMERICAN HYMENOPTERA. 145 



legs slender, four anterior knees and their tibite in front white; abdomen 

 opaque, first segment subopaque, not broad at tip and finely rougliened or 

 aciculate, second and tiiird segments densely j)unctured, fourth less densely 

 so and remaining segments smooth and shining; base of second segment 

 depressed, rugose, gastrocoeli large, shallow, coarsely rugose; apical margin 

 of second and third segments narrowly and subobsoletely dull ferruginous. 

 Length .60 inch. 



Ilab. — Canada, (Pettit, Saunders). 



15. macilentus, Cress. Proc. Ent. Soc. Phil, iv, p. 240, S . 



Hab. — Colorado. A long, narrow species, with the body dull 

 opaque black, except the niesothorax, thorax beneath and scutellunj, 

 which are shining, the latter polished and iuipunctured ; head small; 

 face, anterior orbits, clypeus, except a brown spot on its anterior 

 middle, mandibles and palpi, lemon-yellow; the antenna) are very 

 long, slender, tapering to a fine point at tip, dull black, basal joint 

 beneath spotted with yellowish ; wings yellowish-hyaline; legs black, 

 coxa3 more or less yellow beneath, anterior and intermediate legs 

 mostly yellow, posterior tibiae with a yellow band at base beneath, 

 and their tarsi yellowish-fuscous; abdomen long and narrow, im- 

 maculate. Length % .GO inch. 



16. corvinus, n. sp. 



5. — Small, black, shining, feebly punctured; antennre robust, thickened at 

 tip, a narrow white annulus at about the middle, joints three and four short, 

 Bubequal, not twice longer than broad; scutellum flat, broad at tip, sparsely 

 punctured; metathorax with upper face flattened, truncate behind and ex- 

 cavated medially, upper angles prominent, tuberculiform, central area large 

 elongate-truncate, extending the entire length of upper face; wings subhyaline; 

 legs robust, femora swollen, four anterior tibiae and all the tarsi more or less 

 tinf;ed with rufous, all the tibise with a large white spot on outer side rather 

 above the middle, posterior coxte with a small brown pubescent patch at tip 

 beneath ; abdomen broadly fusiform, seiond segment sparsely and more strongly 

 punctured than the third, gastrocoeli small, subobsolete; first segment gradu- 

 ally and rather broadly dilated at tip which is shining and indistinctly acicu- 

 lated. Length .35 inch. 



7/a6.— White iMts., N. H., (Morrison). 



17. odiosus, Cress. Proc. Cal. Acad. Nat. Sci. 1877, S . 



llab. — California. A subrobust rather shining black species with 

 entirely black antenna) and a pale spot on each side before the wings; 

 the wings are slightly smoky, and the abdomen is faintly tinged with 

 blue. Length % .GO inch. 



18. saevus, Cress. Trans. Am. Ent. Soc. i, p. 290, 9 . 



Hab. — Illinois. The body is entirely black, except a faint pale 

 line at tip of scutellum and two conspicuous white spots at tip of 

 abdomen. The antenna) have a broad white annulus and the wings 



TBANS. AMER. E.NT. SOC. VI. (20) JULY, 1877. 



