88 
Skeletonizing them at first and in their later stages eating entirely 
through. 
Mr. H. G. Dyar has described the larva of wnicolor n. sp. (Trans. Am. 
Ent. Soe., xxu, p. 308), the food-plant being white birch, but in feed- 
ing habits agreeing with the European species. 
TABLE OF SPECIES. 
Females. 
Last dorsal are of abdomen enormously developed. 
Claws bifid. 
Wings slightly infuscated basally; stigma brown basally; dorsum pale. 
1. unicolor n. sp. 
Wings clear; stigma pale; metanotum and abdomen above black. 
2. mexicanus Cameron. 
Claws with minute inner tooth...-... Sclncle Se cmeea eee 3. pontanioides n. sp. 
Last dorsal are not unusually developed. 
Ocellar basin with distinct lateral walls and containing two small tubercles. 
4. pergandei n. sp. 
Ocellar basin with indistinct lateral walls and without tubercles. 
5. chloreus Norton 
1. Nematus unicolor new species. 
1895. Nematus unicolor Dyar. Trans. Am. Ent. Soc., xxi, p. 308. (Larva.) 
Female.—Length 7 mm.; rather robust, shining; clypeus deeply, 
rather narrowly notched, lobes large, rounded; ocellar basin scarcely 
present, deep furrow connecting anterior ocellus with antennal fovea; 
antenne slender, scarcely tapering, setaceous, about as long as head 
and thorax, third, fourth, and fifth jomts subequal; intercostal nearly 
at right angles with costa, interstitial or nearly so; third eubital with 
sides parallel; posterior wings with outer veins of discal cells intersti- 
tial,or nearly so; stigma moderately elongate; sheath tapering, pointed, 
and with terminal abdominai segment enormously developed, repre- 
senting nearly half of abdomen; cerci very long, slender, almost as long 
as first joint of hind tarsi; claws rather large, ner ray very distinetly 
shorter than outer. Color uniformly reddish yellow; wing veins and 
stigma yellowish brown; antenne infuscated basally; ocelli very nar- 
rowly margined with black; basal plates more or less infuseated ; wings 
hyaline, veins brown, stigma and costa yellow, former brown basally. 
Three females, one from Mount Hood, Oreg. (Coll. Am. Ent. Soe.), and 
two reared by Mr. H. G. Dyar from larve on white birch collected in 
Green Valley, New York (Coll. Dyar). 
2. Nematus mexicanus Cameron. 
1884. Nematus mexicanus Cameron. Trans. London Ent. Soc., p. 481. 
Female.—Livid, testaceous; face, sides and apex of abdomen above, and legs 
obscure livid yellow; antenne, metanotum, and back of abdomen except at apex, 
apex of hind tibiz, and tarsi black; anterior tibiz inclining to fuscous; wings 
clear hyaline; costa and stigma whitish yellow; antenn shorter than the abdo- 
