56 
posterior margin of dorsal segments, two terminal segments, venter, 
and legs ; veins dark brown, including costa nearly to base; stigma 
yellowish, nnicolorous, border brownish. 
One female. Washington. (Coll. Am. Ent. Soc.) 
15. Pteronus bicolor new species. 
Female. — Length 5.5 to 6 mm.; robust: clypeus broadly em argin ate, 
lobes small, pointed; ocellar basin with rather faint lateral walls; frontal 
crest unbroken; antennal fovea broad, shallow; antenna 1 slender, 
scarcely tapering, joints 3 and 1 subequal; venation normal; stigma 
broad, rounded on lower margin, rather abruptly narrowed toward tip; 
Sheath tapering to obtusely pointed tip, straight on upper side; claws 
evenly but : not deeply divided. Color black above, pale beneath, the black 
limited to dorsal area of antennae and all of the two basal joints, large 
spot including ocellar basin, ocelli, the occiput, thorax and abdomen 
above, spot on upper half of mesepimera and large spot on pectus, 
together with tip of sheath; face white; orbits and venter pallid, includ- 
ing also lateral edges of terminal abdominal segments above and all of 
last segment : wings hyaline; veins brown; stigma pale basally. 
Two females. Mount Hood, Oreg. (Coll. Am. Ent. Soc), and Olympia, 
Wash. (Coll. Cornell Univ.). 
1G. Pteronus tricolor new species. 
male, — Length 7 mm.; moderately robust, shining; clypeus broadly 
and shallowly emarginate, lobes triangular; frontal crest and sides of 
pentagonal area sharply denned, former unbroken; antennal fovea cir- 
cular; intercostal vein more than its own length anterior to basal vein; 
third cubital cell not much more than one-half as wide at base as at 
apex; stigma moderately broad, rounded on lower margin; upper mid- 
dle cell of hind wings exceeding lower: sheath smooth, polished, 
pointed, bordering hairs very minute. Color of head and thorax for 
most part, first dorsal segment of abdomen and lighter bands on two 
following segments (nearly wanting on third), apex of sheath, apical 
three-fourths of hind femora, hind tibia' and tarsi (the former gradually 
paling toward bases), brownish black; the orbits and portions of the 
center of thorax, including scutellum, light yellowish brown; balance 
of abdomen ferruginous; clypeus and mouth parts, outer angles of 
pronotum, teguke, anterior legs and posterior pair, except as noted, 
yellowish white; anterior femora and tarsi very slightly tinged with 
reddish; stigma and veins, including costa, except extreme base of lat- 
ter, brown. 
One female. New Hampshire. (Coll. Am. Ent. Soc.) 
17. Pteronus rufocinctus Harrington. 
1893. Nematus rufocinctus Harrington. Can. Ent., xxv, p. 58. 
Female. — Length 8 mm. ; rather elongate, shining; clypeus very shal- 
lowly emarginate, approaching truncate ; ocellar basin with very sharply 
