AMERICAN HYMENOPTERA. 203 



two or three apical segments of venter pale reddish-yellow; legs same 

 color; basal half of coxfe, a slender, rather obsolete line on femora 

 above and beneath nearly to tip, black ; the posterior tarsi blackish ; 

 inner claw-tooth large, near to outer tooth; wings hyaline, stigma and 

 costa pale. 



9 . Antennre hardly half the length of body, scarcely flattened, 

 third and fourth joints equal, sutures distinct, more of black upon the 

 femora at base than in the males ; body slender. 



Maine, Massachusetts, Connecticut. Six % , seven 9 . The anten- 

 nfe of this species are of equal size to the fourth joint, each joint a lit- 

 tle globose in the middle. 



19. N. pallicornis. 



Ncniatus -palUcornis, Harris, Cat. Norton, Bost. Proc. viii, 1861, 160, 11, 9. 

 Black; antennse fuscous; body at times with a ferruginous tinge ; labruin, 

 tegulse, anterior angle, vertex more or less \)sAe reddish-yellow. Length 0.16 — 

 0.20. Br. wings 0..36— 0.44 inch. 



9 . Black; body short and rather stout; antennae moderate, slender, 

 third joint longer than fourth, the basal joint black, the remainder 

 ferruginous, darkest above ; lower ocellus in a large basin, nasus emar- 

 ginate; orbits and spot about antennae reddish, nasus and mouth be- 

 neath white; tegulae, anterior angle and venter reddish-yellow, the 

 base of coxas black, remainder of coxae and trochanters white, remain- 

 der of legs yellow-red, paler before; at times the hinder tarsi are fus- 

 cous, and the hinder femora and apex of tibitfi obscure; inner tooth of 

 claws large and near the tip. Wings hyaline, stigma at base and apex 

 and base of costa white. 



S . The male has the antennse paler and the whole venter yellowish. 



Yar. a.%> . A triangular, dark rufous spot on the pleura. (Illinois.) 



Massachusetts, Maine, Illinois. 



This is very much like N. proximatus, but differs in the form of the 

 antennae. 



20. N. obscurus. 



Xcmatus obscurus, !N"orton, Bost. Proc. viii, 1801, 160, 13, 9- 

 Dull black; tegulae, base of abdomen and knees indistinctly ferruginous 

 Length 0.2y. Br. wings 0.58 inch. 



9 . Black, pubescent; third joint of antennas a little longer than 

 fourth; clypeus crenate, labrum brownish-red, shining; mandibles ru- 

 fous at tip; palpi pale; a longitudinal groove upon scutellum; basal 

 membrane, sides of tergum, knees and front of tibiae indistinctly fer- 

 ruginous ; abdomen stout; wings faintly clouded; stigma dull fuscous, 

 costa black. 

 Massachusetts. 



