159 



4. N. LONGICORNI9. Say. Bost. Jour. 1, 219. " Black ; beneath, 

 head and before the wings, whitish. ? . Length three twentieths of 

 an inch." 



Two specimens from Connecticut, The length of the antennae 

 and the pale pectus distinguish this from N. ventralis. 



5. N. VENTRALIS. Say. Long's Sec. Ex. 2, 315. " Black; venter 

 and feet pale ; " obsolete or indistinct pale bands on the edge of each 

 segment of abdomen. 



" $ . Length from one fourth to three tenths of an inch." 

 Eleven specimens examined ; one male from Mass. and Pa. They 

 differ so much in size and appearance that it is doubtful if all belong 

 to this species. The dividing nervure between the third and fourth 

 sub-marginal cells, is, in several cases, wanting. The larvae are said 

 to feed on the willow. 



6. N. SURATUS. Fitch. Third Rep. N. Y. St. Ag. Soc. No. 94. 

 " Black, with four transparent, slightly smoky wings ; mouth, cloud- 

 like spot on the shoulders, edges of abdominal segments and legs, 

 lurid white ; the four anterior thighs being black upon their under 

 sides, and the hind pair wholly black, except at their base. Length 

 0.25 in. ; to the tip of wing 0.30 in." Sex not given. 



I have not seen this insect. It seems to differ from N. ventralis in 

 the absence of white orbits and in its black venter. 



7. N. CORNIGER, (n. sp.) Black ; antennae long, flattened, pale be- 

 neath ; venter and legs pale. (Long. 0.17, Ex. alar. 0.40 in.) 



• $ . Shining black ; antennae as long as body, toward base some- 

 what flattened, slightly enlarged at joints, pale beneath ; head coarsely 

 punctured ; clypeus incurved ; labrum covered with white hair ; a 

 spot between antennse, clypeus, labrum, base of mandibles and palpi 

 pure white ; tegulae, upper half of collar, venter, and legs, white ; 

 tips of posterior femora and tibiae and the tarsi black ; wings hyaline ; 

 stigma and costa blackish. Hab. Conn. 

 One specimen. 



8. N. EXTExsicoRNis, (n. sp.) Black ; antennae long ; tip of venter, 

 knees, and tibiae pale. (Long. 0.27, Ex. alar. 0.60 in.) 



$ . Shining black ; antennae slender, longer than body, joints 

 slightly enlarged ; second joint short, third, fourth, and fifth of equal 

 length ; head and shoulders thinly covered with black hair ; head 

 thickly punctured, rugose ; punctures on thorax running into longitu- 

 dinal striae ; clypeus emarginate, face immaculate ; apex of venter, 

 knees, tibise, and tarsi in part pale luteous ; wings hyaline, strongly 

 bent and emarginate at stif;raa; stigma and costa luteous ; nervures 

 black. Hab. Mt. Washington, N. R 



One specimen taken on the summit by Mr, Scudder. The enlarge- 

 ment of the joints of the antennse is not like that of Pristiphora. 



