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2. Amauronematus concolor Norton. 
1867. Nematm concolor Norton. Trans. Am. Ent. Soc, I, p. 196. (Cat., etc., p. 58.) 
1867. Nematus violaceipennis. Norton. Trans. Am. Ent. Soc, i, p. 201. (Cat., etc., 
p. 63.) 
1886. Nema tus concolor Provancher. Add. Faun. Can. Hym., p. 22. 
Male. — Length G.o to 7 mm.; exp. al. 15 to 10 mm.; slender species; 
clypeus very slightly emarginate, almost truncate; crest and sides of 
ocellar basin nearly obsolete, indistinct; antennal fovea small, very 
elongate; antennae longer than head and thorax, rather robust, flat- 
tened, fourth joint longer than third ; intercostal its own length anterior 
to basal, strongly inclined; third cubital more than twice as long as 
wide at base; venation otherwise normal; procidentia very minute and 
squarely truncate or broadly excavated at apex; hypopygium broad and 
squarely truncate at apex, or slightly emarginate. Color black, with 
hairy pubescence on sides of thorax; clypeus, labium, cheeks, and bases 
of mandibles whitish; upper and outer orbits faintly tinged with rufous; 
wings infuscated; veins, including costa and stigma, brown. 
Two males. Maine and Michigan. (Colls. Am. Ent. Soc. and U. S. 
Nat. Mas.) 
A single male collected in Massachusetts agrees exactly with the 
above in all structural characters, and differs only in that the abdomen 
is lighter, inclining to reddish, strongly infuscated, especially on the 
tip and base. This is Norton's Nematus violaceipemiis, which undoubt- 
edly belongs to concolor. I have seen a specimen also from Natick, 
Mass., collected April 19. (Coll. Cornell Univ.) 
3. Amauronematus comstocki new species. 
Female. — Length 9 mm.; rather elongate, slender; clypeus very shal- 
lowly emarginate; walls of ocellar basin rounded, indistinct, frontal 
crest almost wanting ; antennal fovea shallow, elongate ; antennae short, 
joints 3 to 5 subequal, fourth longest; wing venation normal, stigma 
slightly angulated near middle; sheath obliquely truncate at tip. 
Color dull black; oral region, together with outer orbits and triangle at 
base of antenme, most of pronotum, and venter of abdomen yellowish 
white; labium and palpi dark brown, pronotum marked with one or 
more circular brown spots; apical ventral segments more or less brown; 
sheath black; legs uniformly black, including joints; wings strongly 
infuscated; veins black. 
One female. Ithaca, N. Y., May 2. (Coll. Cornell Univ.) 
This species is very closely allied to gracilis in general appearance, 
but seems to be distinct by the structural characters of the vertex as 
well as colorationally. A. concolor Norton, of which males only are 
known, approaches this species very closely, and breeding records may 
eventually show the two speciesto be identical. 
