59 
prominent, unbroken; fovea shallow; antennae tapering, somewhat 
longer than head and thorax, joints 3 and 4 subequal; second recurrent 
vein interstitial with second transverse cubital ; venation otherwise nor- 
mal stigma moderately broad; claws deeply cleft, rays equal; sheath 
robust, obtusely pointed, straight on upper margin. Color black; lab- 
rum pallid; tips of anterior femora, all hind femora, and abdomen 
except apical segment orange yellow, inclined to reddish on legs; legs 
otherwise black or strongly infuscated; veins dark brown, including 
costa and stigma; wings slightly smoky, especially centrally. 
Three females collected in Colorado: One (Ashmead's type) in Mr. 
Ashmead's collection; the others in collection of Cornell University. 
I have since obtained the original type of Provancher, through the 
kindness of Abbe V. A. Huard, and confirmed the synonymy as above. 
The type specimen now lacks the abdomen, and was labeled by Pro- 
vancher ruficrus (485), although published as fidvicrus. It was cap- 
tured at St. Hyacinthe (Can.), and is in the Provancher collection. 
22. Pteronus populi new species. 
Female. — Length 7 mm.; clypeus broadly but not deeply notched, 
lobes broad, rounded; frontal crest very prominent, unbroken; sides of 
pentagonal area distinctly raised; antennal fovea broad, shallow, not 
distinctly defined ; antenna' slender, slightly tapering, longer than head 
and thorax, third and fourth joints equal; intercostal vein a little in 
advance of basal, not inclined; first transverse cubital hyaline; upper 
middle cell of hind wings extending one-fifth its length beyond lower; 
second transverse cubital more than half as long as third; stigma not 
broad, rounded regularly on lower margin; sheath rather broad, exca- 
vated slightly above, pointed, and with rather dense whitish hairs at 
tip; cerci short; claws deeply cleft, rays nearly equal. Color of bead 
and thorax for the most part, basal plates, base of first dorsal segment, 
terminal segment including sheath and cerci, extreme bases of coxae, 
hind tibiae, hind tarsi, and veins including costa brownish black; tip 
of clypeus, labrum, posterior orbits, outer angles of 'pronotum, tegulae, 
spot on side of mesothorax, abdomen, and legs except as noted yellow- 
ish ferruginous ; orbits, mesothorax, abdomen, and femora inclined to 
reddish; tibae and tarsi of anterior legs very slightly infuscated. 
One female from Massachusetts reared in May, 1888, by Mr. J. G. 
Jack, from larvae found on Populus tremuloides. (Coll. IT. S. ISTat. 
Mus.) 
23. Pteronus hudsonii Dyar. 
1894. Xematus hudsonii magnus Dyar, Trans. Am. Ent. Soc, xxn, p. 306. 
Female. — Length 10 mm.; rather robust, shining; clypeus very shal- 
lowly notched, almost truncate; fovea distinctly excavate, triangular; 
frontal crest very prominent, unbroken ; ocellar basin distinctly defined; 
