AMERICAN HYMENOPTERA. 193 



27. nubivagus, Cress. 



cunsimi/is, Cress, (nee Wesm.) Proc. Ent. Soc. Phil, iii, p. 1G3, % . 



var.Juxta, Cress. Proc. Ent. Soc. Phil, iii, p. 163, % . 



sequdlis, Prov. Nat. Can. vii, p. 76, % . 

 Hob. — Can., Me., Mass., Pa., Va., Col. Black, with abdomen ex- 

 cept first segment, ferruginous; face, scape beneath, tegulae and scu- 

 telluui pale yellowish; four anterior legs, posterior tibiae except tips, 

 and their tarsi yellowish ; the var. juxta has the first segment of 

 abdomen entirely ferruginous. Length % .60 — .70 inch. 



28. coloradensis, n. sp. 



9 . — Sinall, black ; narrow anterior orbits, short line behind summit of eyes, 

 interrupted annulus on antennae, line before tegulse, short line beneath, and 

 spot at apex of abdomen, white; wings hyaline; legs ferruginous, eoxoe, tro- 

 chanters, base of four anterior femora, tips of posterior tibiae and their tarsi, 

 black; abdomen ferruginous, finely punctured, shining, postpetiole with a dis- 

 tinct medial fovea, gastrocoeli small, foveiform. Length .32 inch. 



Hab. — Colorado. 



29. subrufus, Cress. Proc. Ent. Soc. Phil, iii, p. 168, 9 . 



Ilab. — Can., Me., Mass., N. Y., Va., Til. A robust, pale ferrugin- 

 ous species, with pleura and metathorax more or less black ; scutellum 

 pale yellowish; anteunte short, stout, with short thick-set joints, apex 

 black middle joints more or less pale; wings pale fusco-hyaline ; post- 

 petiole finely aciculated, gastrocoeli small, foveiform. Length 9 .50 

 — .55 inch. 



30. suturalis, Say, Bost. Jour. Nat. Hist, i, p. 226. 

 proj)uiqiius, Cress. Proc. Ent. Soc. Phil, iii, p. 172, 9 . 



Bab.— Can., Mass., N. Y., N. J., Pa., Del., Va., 111., Col., N. M., 

 Utah, Dae. A robust ferruginous species, with thoracic sutures and 

 basal margins of abdominal segments more or less black; wings pale 

 fusco-hyaline; antenna) ferruginous at base, black at tips and more 

 or les^ yellowish in middle. Length 9 --IS — .55 inch. 



Quite a common species. The last ventral segment varies much in 

 length, sometimes appearing small and at other times quite large. 



31. subfuscus, Cress.. Proc. Ent. Soc. Phil, iii, p. 173, 9. 



Bab. — Col., Nev., Cal. Very closely allied to suturali.'f, but easily 

 distinguished by the long slender antenme, with basal joints of 

 flagellum long and cylindrical; the black bands on base of abdominal 

 segments are sometimes subobsolete. Length 9 .50 inch. 



32. anceps, Cress. Trans. Am. Ent. Soc. i, p. 309, % 9 . 



Bab. — Ct., Del. A long slender, shining, pale ferruginous species, 

 with yellowish hyaline wings, and yellow scutellum; flagellum fuscous 



TBASS. AMEK. KNT. SOC. VI. (26) JULY, 1877. 



