70 
joints 3 and 4 subequal; venation normal; stigma broad, regularly 
rounded on lower margin; sheath tapering, straight or slightly concave 
on upper margin; cerci short, robust; claws deeply cleft, rays unequal. 
Color very light yellowish; very narrow border of ocelli, small spot on 
occiput, sometimes line on anterior lobe of mesonotum, spot on lateral 
lobes of mesonotum (sometimes subobsolete), apex of scntellum, spot 
between eenchri, brownish black ; posterior tibia' and tarsi very slightly 
infuscated; antennae brown ferruginous, the latter color predominating 
toward tip; sheath sometimes tipped with brown; veins light yellowish 
brown; costa and stigma greenish hyaline. 
Male. — Length 4.5 too mm.; slender, shining; structural characters 
in general of female; procidentia narrow, projecting, squarely truncate 
at apex, about as wide as long. Color of antennae above and basally, 
large spot on vertex including ocelli and extending over occiput and 
covering entire base of head, mesonotum, metanotuin. and abdomen 
except lateral margins of segments black; upper orbits, venter, abdo- 
men, and legs for the most part yellowish ferruginous: lower orbits and 
face below frontal crest and month parts pallid; tibiae and tarsi, particu- 
larly posterior pair, in fnsrated ; lower surface of llagelhun rufous; veins 
brown: costa and stigma somewhat lighter, yellowish brown. 
Nine females, Illinois, Pennsylvania, and New York (Coll. Am. Ent. 
Soc), and from Missouri, Kansas, and Iowa (Coll. U. S. Nat. Mns.). 
Three males. Massachusetts and California. (Coll. Am. Bnt. Soc.) 
For a discussion of the habits of this species, which Mr. Walsh erro- 
neously supposed to be inquilinous in the galls of other Nematines, see 
Proc. Ent. Soc. Wash., in, p. 267. Mr. II. C. Dyar has described the 
early stages from material collected on willow in New York City and at 
Plattsburg, N. Y. 
40. Pteronus vancouverensis new species. 
Female. — Length 6.5 to 7 mm.: not very robust, shining: clypeus 
broadly emarginate, lobes broad: antennal basin with sharply raised 
defining walls ; crest prominent, bilobed or bituberculate; fovea not 
distinctly defined; antennae slender, elongate, fourth joint a little longer 
than third: venation normal; sheath narrow, tapering, pointed; claws 
very minutely but evenly cleft. Color pallid, inclined to resinous; 
antenna* black above, yellowish beneath; anterior lobes of mesonotum 
brownish, infuscated centrally; tip of scntellum with spot on either 
side and spots on center of metanotuin black: costa and stigma 
hyaline, veins otherwise dark brown; extremities of legs very slightly 
infuscated, together with extreme tip of sheath. 
Male. — Length G mm.; .slender, shining; procidentia projecting con- 
siderably more than its width, narrow, squarely truncate at tip; claws 
minutely and evenly cleft. Color of antenna? above, large spot includ- 
ing ocelli and extending over vertex and occiput, lobes of mesonotum 
except scutellum and metanotuin, most of basal abdominal segment 
