116 
One female. Nevada. (Ooll. U. S. Nat. Mus.) A specimen from 
Ithaca. X. Y., lias also been referred, doubtfully, to this species. 
Mr. H. G. Dyar reared this insect from green larvae found on white 
birch (Betula papyrifera) at Keene Valley, N. Y., and also on willow 
and yellow birch at Jefferson, N. Y r . 
4. Pristiphora lata Ores son. 
1880, Netnatua httus Cresson. Trans. Am. Ent. Boc., vm. p. 4. 
Female. — Length 5.5 mm. ; short, very robust; head nearly as wide as 
thorax, not noticeably trilobed, finely granulate; body generally clothed 
with fine hoary pile; clypeus truncate; frontal crest and sides of ocellar 
basin entirely wanting; antenna] fovea very minute, shallow, circular; 
antennae short, not longer than head aud thorax, somewhat compressed, 
tapering, third and fourth joints subequai; intercostal cross nerve nearly 
interstitial with basal, inclined; third cubital cell not more than twice 
as long as wide at base; venation otherwise normal; sheath not very 
robust, tapering on both edges, with distinct scopa; cerci minute, not 
tapering; inner tooth of Claw very minute. Color black; head and tho- 
rax opaque, abdomen shining; clypeus, apical two- thirds of first pair of 
femora and their tibiae, and tarsi fulvous, inclined to fuscous; posterior 
tibia- and tarsi fuscous; wings hyaline; veins dark brown ; extreme angle 
of pronotum fulvous. 
Male. — Characters in general as in the female. Color the same, except 
that the female sometimes has the extreme tip of the pronotum yellow; 
antennae robust, short, strongly compressed; first cubital cross vein 
hyaline. Easily distinguished from all other males of the genus by the 
black pronotum and teguhe, and black or strongly infuscated hind 
tibiae. 
Two females and one male. Nevada. (Colls. Am. Ent. Soc. aud U. S. 
Nat. Mus.) 
This species is very closely allied to labradoris, but differs particularly 
in the much wider head relative to the thorax, and also in minor details. 
5. Pristiphora siskiyouensis new species. 
Female. — Length 5 mm.; rather robust; head large, nearly as wide 
as thorax; vertex smooth, shining, with no indications of ridges; clyp- 
eus nearly truncate; antennal fovea wanting, or nearly so; antennae 
slender, slightly tapering, third joint much longer than fourth; claw 
with minute inner tooth ; venation normal, except that second cubital 
is wanting. Color black, shining, including mouth parts and teguhe; 
anterior tibiae aud tarsi pallid, the tarsi slightly infuscated; posterior 
tibiae white, except tips, which, with posterior tarsi, are brownish, 
almost black; wings hyaline; veins and stigma brown. 
Male. — Agrees with female in colorational characters; antennae 
stouter and somewhat compressed, distinctly tapering; easily distin- 
guished by the black i)rouotuni and teguhe from other species, except 
