68 
crest prominent, unbroken; fovea deeply excavated but not distinctly 
limited; antennae very slender, tapering-, joint 4 a little longer than 3; 
venation normal, except that the intercostal vein is nearly interstitial 
witli basal; sheath narrow, tapering- to rounded tip; claws coarsely but 
not very deeply notched, rays subequal. Color of antennae, large sf)ot 
including ocelli extending over vertex, mesonotum, metanotum, and 
abdomen dorsally black; orbits, face beneath frontal crest, pronotuin, 
teguhe, lateral area of thorax, abdomen above, venter and legs alto- 
gether yellowish or pallid; pectus brown; tips of posterior tibia 1 , tarsi 
and extreme edge of sheath brownish; stigma and costa hyaline; veins 
otherwise brown. 
One female, reared by Mr. 11. G. Dyar from a solitary larva taken 
feeding on edge of leaf of white birch. The larva was described by 
Mr. Dyar under the name of Nematus lateralis Norton. (Trans. Am. 
Ent. Soc, xxii, 1895, p. 307.) 
37. Pteronus vertebratus Say. 
1836. Nematus vertebratus Say. Host. Jouru. Nat. Hist., i, p. 218. 
1859. Nematus vertebratus Leconte, Say, Ent., n. p. 678. 
1861. Nematus vertebratus Norton. Proc. Boat. Soc. Nat. Hist. , vm, p. 158. 
IStjT. Nematus vertebratus Norton. Trans. Am, Ent. Soc, I, p, 215. (Cat., etc., p. 77.) 
1880. Nematus dorsivittatus ( Iresson. Trans. Am. Ent. Soc, vm, p. 10. 
L895. Nematus dorsivittatus Dyar. Trans. Am. Ent. Soc, xxii, p. 303. 
Female. — Length (J mm.; rather robust, shining-; clypeus distinctly 
but not very broadly emarginate, lobes rounded; sides of ocellar basin 
distinctly, rather sharply raised ; frontal crest rounded, broken at mid- 
dle; antenna] fovea circular, shallow; antennae very long, slender, 
considerably longer than head and thorax; joints 3 to 5 subequal; vena- 
tion normal: stigma moderate, circular on lower margin; sheath rather 
pointed, lower margin regularly rounded, upper straight or slightly 
concave, bordering hairs very minute; cerci slender, scarcely tapering; 
claws not very deeply notched, rays subequal. Color light yellowish; 
autenme, spot on vertex including ocelli extending back over occiput, 
lobes of mesonotum except lateral edges, metanotum, and tergum 
centrally except apex of last sclerite black or dark brown; antenme 
lighter beneath ; upper margins of hind tibia* and their tarsi more or less 
infuscated; extreme tip of sheath brownish; veins brownish, including 
costa nearly to base; stigma uuicolorous, pale. 
Male. — Length 4 mm.; slender, sinning; antenme as long as the body 
of the insect; structurally in general as the female; antennal joints 
decreasing uniformly in length from third to tip; fovea somewhat tri- 
angular, extending laterally over base of antenna 1 ; procidentia narrow, 
nearly twice as long as wide, slightly notched at tip. Color of antennae 
basally above, spot including ocelli and extending over occiput, meso- 
notum, metanotum, and dorsum of abdomen black; face below frontal 
crest, orbits, pronotuin, teguhe and entire venter, yellowish; antennae 
