82 
In some specimens the mesepimera are entirely reddish or only 
slightly infuscated on their lower portion ; also part of the face and base 
of wings are inclined to whitish. 
Four females. Colorado and Nevada. (Coll. Am. But. Soc.) 
This species scarcely differs from A.fulvipes Norton. 
14. Amauronematus luteotergum Norton. 
1861. Nematus luteotergum Norton. Proc. Bost. Soc. Nat. Hist., vin, p. 161. 
1867. Nematus luteotergum Norton. Trans. Am. Ent. Soc, 1, p. 206. (Cat., etc., 
p. 68.) 
1882. Nematus luteotergum Provancher. Nat. Can., xn, p. 291. 
1883. Nematus luteotergum Provancher. Faun. Ent. Can. Hym., 11, p. 740. 
1895. Nematus luteotergum Dyar. Trans. Am. Ent. Soc, XXII, p. 301. 
Female. — Length 8.5 mm.; exp. al. 19 mm.; very robust; head and 
thorax opaque, abdomen shining, the former covered with a very minute 
hairy pubescence; clypeus somewhat broadly emarginate, lobes small, 
rounded; frontal crest and sides of ocellar basin indistinct; antennal 
fovea elongate, shallow; antennje as long as head and thorax, fourth 
joint longer than third; intercostal cross nerve its own length anterior 
to basal nerve, strongly inclined; second transverse cubital but half 
as long as third; venation otherwise normal; stigma very narrow, elon. 
gate, and acuminate; sheath elongate, obtusely rounded at apex; cerci 
very long, scarcely tapering; claws deeply notched, the rays almost 
equal. Color of head and thorax for the most part, usually the dorsal 
center of basal plates with lateral spot and terminal dorsal segment of 
abdomen, sheath, legs, cerci, labium, and palpi black; front face of two 
anterior pairs of femora and tibiae, paler; terminal joints of antennas 
rarely, spot beneath base of antenna', clypeus, labrum, bases of mandi- 
bles, more or less of upper and outer orbits, angles of pronotum, spot on 
lateral half of basal plates, and abdomen except as noted yellowish 
ferruginous; veins and stigma, including costa and teguhe, dark brown; 
anterior wings particularly infuscated, and with a minute dot near the 
center of the second cubital cell, also one near the apex of the median 
cell. 
Three females. Massachusetts. (Coll. Am. Ent. Soc.) I have also 
compared live specimens (females), representing Wellesley and Natick, 
Mass., and Ithaca, N. Y. (Coll. Cornell Univ.) Mr. H. G. Dyar de- 
scribes the larvae of this species from specimens taken on alder, Keene 
Valley, N. Y. 
15. Amauronematus discolor Cresson. 
1880. Nematus discolor Cresson. Trans. Am. Ent. Soc, vm, p. 8. 
Female. — Length 8.5 mm.; exp. al. 18 mm.; large, elongate, moder- 
ately robust species; the clypeus rather deeply emarginate, lobes large, 
rounded; frontal crest strongly elevated; sides of ocellar basin some- 
what indistinct; fovea very elongate, shallow, and cutting through the 
