206 EDWARD NORTON. 



incurved; l;i])rum piceous ; tegulae, anterior angle and the abdomen, 

 except the two basal segments, rufous; legs varied; the cox jb, tro- 

 chanters, intermediate tibife and tarsi, and a band at base of the hinder 

 tibiae vfhite; the four hinder femora and apex of intermediate tibite 

 rufous ; apex of hinder femora and apical two-thirds of their tibijx? and 

 the tarsi black. Wings perfectly clear, stigma fuscous, costa pale. 

 Massachusetts, (Coll. Am. Ent. Soc.) One 9 . 



25. N. luteo-tergum. 



Xcnititus lufeo-terr/um, Norton, Bost. Proc. viu, 1861, 101, 14, % . 



Black; mouth whitish, an orbital line, the abdomen and anterior legs rufous, 

 wings subviolaeeous. 



Length % , 0.24. Br. wings 0.50 inch. 



Length 9.0.32. Br. wings O.r.fi inch. 

 9 . Body long and not very stout; antennas about half the length 

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

 basin ; head dull, with coarse, confluent punctures ; nasus wide and 

 distinctly notched; mandibles with a strong inner tooth; an axe- 

 shaped spot beneath the antennae; nasus, labrum, base of mandibles 

 and the anterior angle whitish, (the latter with a black, i-ound central 

 spot); orbits without and a separate spot opposite ocelli within, red- 

 dish ; tegulas dark ; basal membrane and abdomen chestnut-red, at the 

 basal segment blackish ; legs black ; the two anterior pair in front, be- 

 low the middle of femora and the base of posterior coxae varying from 

 reddish-white to piceous; inner anterior tarsal spur bifid; inner tooth 

 of claws large; wings with a violaceous tinge; nervures piceous. 



% . The antenuic of male are longer, the axe-shaped spot below an- 

 tennae, most of the outer orbital mark, and the pale anteri(n- angle are 

 wanting and the legs are more varied with piceous ; wings almost hya- 

 line. 



Maine; Connecticut. Two 9 , two % . 



26. N. fur. 



Xematus fur, Walsh, Troc. Ent. Soc. Phil, vi, 186(3, 263, %. 

 Length % , 0..'.9 inch. Br. wing, % , 0.38 inch. 

 " % . Black ; head opacpie, very minutely and closely punctate, ru- 

 gose. Clypcus, labrum, the extreme tip of the cheek and the base of 

 the mandibles all dull greenish-white. Clypeus emarginate in a circu- 

 lar arc of abjut 45'^, with a small tubercle in the middle of its anterior 

 margin. Jjabrum full as long as wide, its tip rounded. Anteuu;^ 

 black, four-fifths as long as body, rather more compressed than is usual 

 in % , fourth and fifth joints equal in length, third shorter by one- 

 fourth. Thorax opa(|ue, very minutely rugose, subpolished on the pec- 

 tus; a pale subtriangular tubercle on the lateral margin of the black, 



