79 
7. Amauronematus cooki new species. 
Male. — Length 5 mm.; clypeus moderately and rather narrowly 
emarginate, lobes small, rounded; frontal crest not extending at all 
laterally, slightly broken by the shallow antennal fovea; sides of pen- 
tagonal area rounded, indistinct; furrows running from occiput to base 
of antennae wide and deep; antenna 4 longer than head and thorax, joints 
4 and 5 subequal, longer than 3; venation normal; procidentia short, 
squarely truncate with sharp angles, keeled; claws deeply notched. 
Color black; clypeus, oral region and beneath eyes whitish; joints of 
legs, with more or less of anterior face of tibia and apices of femora, 
yellowish; wings hyaline; stigma and veins, including costa nearly to 
base, dark brown ; extreme angles of pronotum sordid yellowish. 
One male. Michigan. (Coll. U. S. Nat. Mus.) 
8. Amauronematus borealis Marlatt. 
1892. Xematns borealis Marlatt. Proe. Acad. Nat. Sci. Pbila., 1892, p. 133. 
Male. — Length o* mm.; exp. al. 14 mm.; head and thorax coarsely 
punctured, body generally more or less shining, particularly the abdo- 
men; clypeus circularly but not deeply emarginate; frontal crest and 
sides of ocellar basin indistinct; antennal fovea elongate; antennas 
rather stout, flattened, joints 4 and 5 with downward curve, fourth joint 
longest; third submarginal cell very narrow at base, not much more 
than one-third as wide as at apex; venation otherwise normal; stigma 
widest and slightly angulated one-third from base, tapering regularly 
to acuminate apex; procidentia narrow, short, constricted at base, 
truncate at apex; hypopygium narrow, rounded at tip; claws deeply 
cleft, rays subequal. Color black; labrum, tip of abdomen, tips of 
femora, the tibhe and tarsi, except terminal joints of latter, yellowish 
or resinous; wings perfectly hyaline; veins dark brown, including costa 
to base; stigma luteous, with narrow brown border. 
One male. Disco Island. (Coll. Am. Ent. Soc.) 
9. Amauronematus nigrofemoratus Cresson. 
1880. Xemat us nigrofemoratus Cresson. Trans. Am. Ent. Soc, VIII, p. 4. 
Female. — Length 0.5 mm. ; exp. al. 1G mm. ; very robust; clypeus very 
slightly emarginate, almost truncate; frontal crest and sides of ocellar 
basin indistinct; antennal fovea shallow, not distinctly defined, elon- 
gate; antennae short, hardly as long as head and thorax, third to fifth 
joints subequal; intercostal cross vein very near basal, strongly inclined; 
venation otherwise normal; stigma broadest at base; sheath rather 
large, rounded on both sides toward the obtuse tip, which bears a dense 
scopa; cerci slender, medium, scarcely tapering. Color in general 
black; entire body, particularly the thorax, with a fine sericeus pile; 
upper and outer orbits, edge of angles of pronotum, border of tegulae, 
spot below eyes, tip of clypeus and the labium, trochanters, tips of 
