53 
pentagonal area distinctly raised, former unbroken; antennal fovea 
deep, triangular; antennae slender, longer than head and thorax, third 
and fourth joints equal; intercostal vein its own length anterior to 
basal vein ; upper cell of hind wings exceeding lower ; stigma broad, 
rounded on lower margin; second transverse cubital one-third length 
of third, or third cubital cell strongly divaricating; sheath very nar- 
row and obtusely pointed at tip, smooth, without or with very minute 
hairs; cerci short; claws deeply and almost evenly notched. Color of 
head except faint ferruginous touches about orbits, thorax, the first 
dorsal sclerite of abdomen, and bases of posterior coxae black ; following 
dorsal sclerites of abdomen with interrupted brown stripes on each ; 
antenna3 brownish, lighter beneath, especially toward tips ; extreme tips 
posterior femora, apical two-thirds of their tibiae and all their tarsi, tips 
of anterior pairs of tarsi, and narrow margin of sheath fuscous; clypeus 
and mouth parts light resinous; legs and abdomen, except as noted, 
light ferruginous; wing veins light brown, stigma and costa paler 
basally. 
Male. — Length G mm. ; slender, elongate ; clypeus broadly emarginate, 
lobes short, pointed; walls about ocellar basin very minute, but dis- 
tinctly defined; crest unbroken, not strongly raised; fovea very shallow, 
triangular; antennas robust, strongly tapering, somewhat flattened, 
joints 3 to 5 subequal, third a little longer than others ; venation nor- 
mal; procidentia narrow, projecting somewhat more than its width, 
rounded at tip; claws rather deeply cleft, rays subequal. Color black, 
shining; mouth parts and legs, venter of abdomen, including more or 
less of apical edge of dorsal segments and nearly all of terminal seg- 
ments, yellowish ferruginous; angles of pronotum widely, andtegula3 
pallid; wings hyaline, veins brown, including stigma and costa; hind 
tibiad and their tarsi brownish; posterior orbits very faintly reddish, 
strongly infuscated; antenna} reddish, especially beyond basal joints 
and on lower edge. 
Three females and two males. Colorado and Montana. (Coll. Am. 
Ent. Soc.) 
11. Pteronus harringtoni new species. 
Female. — Length 7 mm.; robust, shining; clypeus broadly and not 
deeply notched; ocellar basin distinctly defined; crest strong, unbroken; 
fovea deep, with lateral channels running from it over bases of antennas; 
antennae short, tapering, joints 3 and 4 nearly equal; intercostal at 
right angles, or nearly so, with costa; second recurrent interstitial, 
stigma rounded on lower margin, somewhat acuminate at apex; cerci 
very short; claws deeply cleft, rays equal. Color black; angles of 
pronotum, tegulae, legs for the most part, and venter of abdomen, 
together with marginal third of dorsum, reddish yellow; tip of clypeus 
and mouth parts yellowish, infuscated; extreme tips of posterior tibiae 
