48 
1. Pteronus vicinalis Cresson. 1 
1880. Xematus vicinalis Cresson. Trans. Am. Ent. Soc, vm, p. 4. 
Female.-~LeTigth. S.5 mm. ; very large, robust, shining, obscured by 
some rather dense punctuation on head and thorax ; clypeus rather deep- 
ly, circularly emarginate; ridges about ocellar basin flattened, indistinct; 
frontal crest broad, slightly notched: antennal fovea shallow, indis- 
tinct; antennae not much longer than head and thorax, scarcely taper- 
ing, joints 3 to 5 subequal; intercostal very slightly, if at all, inclined ; 
stigma narrow, acuminate; sheath broad, tapering, obtusely pointed; 
cerci slender, not tapering; claws large, deeply notched, rays equal. 
Color black; clypeus, apices of coxa', trochanters and tibia 1 except apices 
of posterior pair, and anterior tarsi whitish, infuscated; posterior tarsi, 
with tips of posterior tibia', nearly black; veins very dark brown, includ- 
ing stigma and costa, the latter to base; teguhe dark brown, strongly 
infuscated: wings somewhat infuscated. 
One female, Cresson's type. California. (Coll. Am. Ent. Soc.) 
2. Pteronus occidentalis new species. 
Female. — Length 7.5 mm.; moderately robust, shining; clypeus 
broadly and shallowly emarginate. approaching truncate; antennal 
fovea broad, circular; antennae distinctly tapering, not much longer 
than head and thorax, third joint distinctly longer than fourth; upper 
middle cell of hind wings as long as or more commonly longer than 
lower; intercostal vein very close to basal vein; third cubital cell long, 
sides almost parallel: stigma long, narrow; sheath rather sharply 
pointed: claws evenly and rather finely cleft. Color black; triangular 
space below antenna, tip of clypeus and the mouth parts, pronotum, 
teguhe, legs except middle portion of femora and tips of hind tibia', 
and more or less of all tarsi whitish; tarsi and tips of hind tibiae 
strongly infuscated, brownish; venter of abdomen, except tip, pale; 
veins, including stigma and costa, dark brown; wings nearly hyaline. 
Xine females, three bred from willow larva', collected in Placer County, 
Cal., and the others collected about Los Angeles. (Coll. U. S. Nat. Mus.) 
3. Pteronus latus new species. 
Female. — Length 8 mm.; very robust and broad, viewed from above; 
abdomen scarcely constricted at base, sides nearly parallel; clypeus 
very broadly and shallowly emarginate; antennal fovea triangular, 
distinctly excavated; ocellar basin well defined; frontal crest slightly 
notched at center; antenna* moderately robust, tapering, joints 3 and 4 
subequal; venation normal; stigma rather narrow, tapering gradually 
to apex; sheath broadly rounded on lower margin, pointed at tip; 
'This, with the following five species, is allied to the genus Amauroncmatus in the 
character of the stigma, hut seem to he thrown out of the latter genus hy lacking 
any unusual development of lahium and other mouth parts, as well as other charac- 
ters of the genus. 
