202 EDWARD NORTON. 



than fourth ; sutures at sides of ocelli deep; lower oeellus in a distinct- 

 ly triangular space; nasus with a shallow notch; outer and inner or- 

 bits, space about antennae and beneath, teyulae, anterior angle, edges 

 of abdomen, incomplete or obsolete bands between segments and the 

 venter pale yellow; logs of the same color; coxae, a band covering 

 most part of femora and the apical end of posterior tibiae black ; poste- 

 rior tarsi blackish ; inner tooth of claw large and near the end of claw. 

 Wings hyaline, nervures dark, base of costa whitish. 



%. The male has the ''hypostoma, palpi and mandibles at base 

 whitish; orbits above and behind pieeous ; thorax dilated ; triangular 

 line before the wing and wing-scale whitish, wings slightly dusky, ner- 

 vures fuscous; feet honey-yellow, posterior tarsi black-brown; tergum 

 black, segments each with a yellow band, of which the four terminal 

 ones are interrupted in the middle; venter pale honey-yellow." 



Maine, Connecticut, New York, Pennsylvania. 



A male from Connecticut agrees entirely with the description by 

 Say, but I do not feel certain that it is the male of iV. ventral is. 



Several 9 fi'om Pennsylvania have shorter antennae, and the second 

 recurrent nervure received very near the intersection of second and 

 third cells. 



17. N. longicornis. 



Xcmatus longicornis, Escholz, Entomogr. 1S22, 9S, 06. 



"Black, with the margin of tergum fuscous, the venter and legs 

 pale; posterior feraoi'a black; costa of wings pale, stigma brown. 

 Head black, labruin yellowish; eyes clear gray; length 2,\ lines; an- 

 tennfc longer than the moiety of body, setaceous, black; corselet black, 

 its anterior border forming a yellowish collar ; abdomen wide, flat ; 

 back brownish; lateral margins of a clear yellow ; venter yellow ; wings 

 longer than the body, narrow, transparent, costa yellow, stigma and 

 nervures brown; three discoidal cells; legs yellow; posterior femora 

 black-brown in the middle." 



Isle of IJnalaska, llus. America. 



18. N. proximatus. 



Nemntus proximatus, Norton, Bost. Proc. viii, 1861. 12, 9. 

 Black; outer orbits, mouth, tegulse, ape.\ of venter and legs, in part, recldisli- 

 yellow. Length 0.22. Br. wing.s 0.50 inch. 



% . Shining black; body slender; antcnn:c two-thirds the length of 

 body, flattened, third joint shorter than fourth ; lower ocellus in a 

 wide, flattened basin; the whole outer orbit to suture, and a very nar- 

 row inner orbital line, base of antennae and face below, (pal|)i dark.) 

 tegula), upper and hinder edge of anterior angle, apex of abdouien. and 



