160 



9. N. NiGRiTUS, (n. sp.) Black ; mouth, tegulae, tip of venter, and 

 legs pale. (Long. 0.18 to 0.20, Ex. alar. 0.r)0 in.) 



$ . Shining black ; antennae not so long as body ; head rugose, 

 almost lineate ; pubescent with brownish hair ; clypeus hardly emar- 

 ginate; mouth dull white; orbits beneath and behind whitish; 

 tegulaj, spot on first segment of abdomen, tip of venter and legs, dull 

 white ; base of femora and coxae black ; apex of posterior tibiae and 

 all the tarsi blackish ; wings hyaline, bent at stigma ; stigma and costa 

 pale-greenish. Hab. Farmington, Conn. 



Two specimens. One of them is smaller than the other, and has a 

 slight ferruginous tinge. 



10. N. FULViPES. H. Cat. Black ; legs and body beneath fulvous ; 

 mouth dull white. (Long. 0.22, Ex. alar. 0.44 in.) 



5 . Color black ; head about the ocelli roughened ; clypeus moder- 

 ately emarginate retracted ; a black spot in disk of labrum ; edges of 

 clypeus and of labrum, base of mandibles and palpi, dull white ; 

 tegulae, pleura, pectus, and legs, fulvous ; a large black spot beneath 

 wings ; abdomen at apex and beneath, with a fulvous tinge ; tibiae 

 and tarsi dull white ; posterior tarsi black ; wings hyaline ; stigma 

 and costa pale. Hab. Mass., (H. Coll.) 



One specimen. 



11. N. PALLicoRXis and N. labratus. H. Cat. Black; an- 

 tennae fuscous ; body with a ferruginous tinge ; labrum and legs dull 

 white. (Long. 0.19, Ex. alar. 0.42 in.) 



? . Black ; antennae fuscous, palest beneath, two basal joints black 

 at base ; head rounded, a deep sinus about each of antenna? ; clypeus 

 retracted, not emarginate ; labrum almost square, whitish, with a nar- 

 row black line in middle ; mandibles at base and palpi pale ; tegulas, 

 a spot on first segment of abdomen, and the legs, dull white ; tips of 

 tarsi dark ; body with a ferruginous tinge, varying in different speci- 

 mens, most distinct at sides and beneath ; wings hyaline ; stigma and 

 costa pale. Hab. Mass., (H. Coll.) 



Four specimens. One of which was thought by Dr. Harris to be 

 the female of N. fuloipes. A variety named labratus, by Dr. Harris, 

 has the labrum a little wider ; the femora black in middle, and the 

 tibiae and tarsi blackish, and but two submarginal areolets. 



12. N. PROXiMATUS, (n. sp.) Black; the mouth, tegulae, edge of 

 collar and legs luteous. (Long. 0.15, Ex. alar. 0.36 in.) 



? • Collar black ; antennae sub-fuscous ; a blunt spine between 

 antenna? ; clypeus wide and retracted, not emarginate ; labrum and 

 mandibles reddish luteous ; palpi pale ; teguke, edge of collar and 

 legs luteous ; base of coxa? and middle of femora black ; tibije toward 

 apex, and tarsi, in part, blackish ; abdomen short and stout ; segments 



