THE CANADIAN ENTOMOLOGIST. 49 



Colour black ; lobes of clypeus, labrum, mandibles, tegul?e, legs from 

 middle of femora, last apical segment of abdomen, reddish-ferruginous; 

 trochanters pallid ; palpi brown ; upper orbits dark reddish. Wings 

 hyaline ; nervures light brown, costa at base and the entire stigma pallid. 

 Habitat. — Florissant, Colo., June i, 1907 (S. A. Rohwer), on foliage 

 of Salix hrachycarpa. 



In Marlatt's Revision of the Nematinae of N. Am., this species runs 

 out because of the black venter, but it seems to be related to P. atriceps, 

 Marl, and may be separated from it by the black venter, smaller size, the 

 fovea not deep, etc, 



Pteroiius notattis, n. sp. — 2. Length, 5^ mm. Clypeus angularly 

 emarginate, lobes round; antennal fovea deep, narrow, elongate ; ocellar 

 basin with walls round ; frontal crest broken in the middle ; antennae 

 slender, reaching about to tliird abdominal segment, joints three, four and 

 five subequal, the tliird a little curved; sheath broad, obtusely pointed, 

 without any hairs at apex. Claws deeply cleft, inner ray a little shorter 

 than outer. The third cubital cell one and a half times as wide at apex as 

 at base, a little more than twice as long as wide at base ; upper discal cell 

 in hind wings extending considerably beyond lower ; stigma straight on 

 lower margin until apical third, where it slants abruptly upward- 

 Colour black, clypeus, labrum, base of mandibles (the tips are piceous), 

 coxce, except at base of posterior ones, trochanters, posterior angles 

 of pronotum and tegulae whitish ; upper posterior and superior orbits 

 broadly, legs from trochanters, except a thin black line above and below 

 on posterior femora, apical segment of abdomen and sheath somewhat, 

 ferruginous ; palpi brown. Wings dusky hyaline ; nervures brown, costa 

 and stigma pallid. 



Habitat. — Florissant, Colo., June 23, 1907 (S. A. Rohwer), on foliage 

 of Salix brachycarpa. 



In Marlatt's Revision of the Nematinae of N. Am., this species runs 

 out on account of the black venter, but it seems to be near P, Coioradensis, 

 Marl, from which it may be separated by the black venter, antennal 

 fovea ?iot being triangular, etc. It is, however, closely related to P. hypo- 

 melas, n. sp., but may easily be separated by the following comparison. 

 Other characters also separate these two species : 



P. hypovielas. 



1. Clypeus broadly, shallovvly emarginate, lobes small. 



2. Eyes almost round on upper margin. 



