AMERICAN HYMENOrTERA. 177 



four anterior coxae and trochanters are lemon-yellow j wings clear. 

 Length S .55 inch. 



156. virginicus, Cress. Proc. Ent. Soc. Phil, iii, p. 181, 9 . 



Hah. — West Virginia. A medium sized, robust black species, with 

 short ferruginous abdomen and clear wings; antennae short, stout, with 

 white anuulus; legs robust, short, posterior tibiae reddish at base; head 

 and thorax immaculate. Length 9 .50 inch. 



157. vultus, Cress. Proc. Ent. Soc. Phil, iii, p. 1G5, % . 



ILib. — Colorado. A small slender black species, with ferruginous 

 abdomen and legs ; face and apex of scutellum yellow ; wings clear. 

 Length % .35 inch. 



158. Saundersii, n. sp. 



%. — Black; anterior orbits broad on face, and sides of clypeus, white; 

 autennse black above with a narrow indistinct pale annulus, beneath fulvous 

 black at extreme base and apex; thorax immaculate, shining; most of tegulte, 

 dot in front and short line beneath whitish; wings hyaline, iridescent; spot 

 on four anterior coxae beneath and their knees, tibiae and tarsi more or less 

 yellow, base of posterior tibiae and of their tarsal joints dull ferruginous; ab- 

 domen ferruginous, finely punctured, first segment except postpetiole black, the 

 latter punctured; gastrocoeli moderately large and deep. Length .35 inch. 



Hah. — Canada. (Mr. William Saunders). 



151*. canadensis, Cress. Trans. Am. Ent. Soc. i, p. 308, 9 . 



JIah. — Canada. A robust black species, with ferruginous abdomen, 

 the third and fourth segments of which are black at base ; the tibije 

 are yellowish-white, black at tips, also scutellum and annulus on an- 

 tennas; wings subhyaline; antennae with short stout joints. Length 

 9 .43 inch. 



160. instabilis, Cress. Trans. Am. Ent. Soc. i, p. .303, ^9. 

 IJah.—Can., iMe., Mass., Ct., N. Y., N. J., Va., Ga., Col. A very 



variable species with the thorax, except scutellum, sometimes entirely 

 black, sometimes with the mesothorax, and metathorax more or less 

 ferruginous; the abdomen is often entirely ferruginous, sometimes 

 more or less black at tip; the antennae are slender, that of 9 with a 

 broad pale annulus. Length % 9 .50 inch. For notes on variation, 

 see original description. 



161. fuscifrons, Cress, Proc. Ent. Soc. Phil, iii, p. 1(56, 9; Trans. 

 Am. Ent. Soc. i, p. 307. 



IJab. — N. Y., 111. Form slender, ferruginous, head and thorax 

 more or less black or fuscous; scutellum pale yellowish; antennie 

 slender, with pale annulus; wings clear; a spot at tip of abdomen, 



TUANS. AMKK. E.NT. SOC. VI. (24) JULY, 1677. 



