127 
ished on the pectus; a pale subtriangular tubercle on the lateral margin of the 
black, subpolished, basal plate; abdomen subpolished, bright fulvo-rufous, the 
basal edge of joint 1, next the basal membrane, which is whitish, clouded with 
black; genitals obfuscated; legs black; wings subhyaline, slightly tinged with 
fuliginous; veins and stigma black. 
Rock Island, 1. 
One male bred March 29, from an old subpeduneled spherical gall of Cecidomyia 
s. batatas Walsh, on S. humilis. Female unknown. As the mother sawfly must 
have deposited her egg in this gall after the gall maker had quit it, or not long 
before, it is a question if this species can be considered an inquiline. 
There is very little doubt but that this is the same with NV. luteotergum male, which 
only differs in having the legs in part piceous and in being somewhat smaller, 
(See note 2, p. 22.) 
2, Pteronus (?) hudsonicus Norton. 
1867. Nematus hudsonicus Norton. Trans, Am. Ent, Soc., 1, p. 207. (Cat., ete., 
p. 69.) 
Black; orbits, mouth, tegule, anterior angle, venter, and legs, except a black line 
on two posterior pair, white; length 0.58; br. wings 0,76 inch. 
Female.—Antenne less than half as long as the body, joints cylindrical, somewhat 
enlarged at tip, third and fourth of equal length; sutures at sides of ocelli deep; 
ocelli in a triangular basin; nasus very slightly emarginate; orbits, space about 
antenn:e and mouth beneath, teguliv, anterior angle (a black line in middle), and the 
venter whitish, the latter with a row of black spots on each side forming an inter- 
rupted black line; scutel large, produced behind a slightly raised angle; legs dull 
white, with the basal upper half of anterior femora, a line down the upper side of 
posterior femora, and tibive and their tarsi black; anterior inner spur of tibiw blunt, 
bifid; inner tooth of claw large; wings hyaline; stigma and costa brown; emargina- 
tion of stigma distinct. 
One female. Fort Good Hope, Mackenzie River, Hudson Bay Territory (Rk. Ken- 
nicott). 
3. Pteronus (?) lateralis Norton. 
1867. Nematus lateralis Norton. Trans. Am. Ent. Soc.,1,p. 211. (Cat., ete., p. 73. 
Black; orbits, face below antennie, pleura, body, body beneath (except breast), 
and legs pale; length 0.38; br. wings 0.76 inch. 
Female.—Antenn half the length of body, joints cylindrical, third and fourth 
equal, shghtly enlarged at tips; sutures at sides of ocelli deep; lower ocellus in a 
shallow circular space, which has a distinct ridge around its upper half; nasus pro- 
duced, distinctly emarginate in middle and at sides; tongue and palpi dark, last 
joint of maxillary palpi shorter than the preceding; the whole orbits as far as 
sutures, two spots behind ocelli, a spot above antennw, space around, and face below 
reddish white; sutures of metathorax and a bent line between upper wings crossing 
upper half of seutel rufous; tegulie, anterior angle, pleura, and body beneath except 
a black spot on breast reddish white; legs the same color; tarsi fuscous; a slender 
black line on the upper and lower side of femora, and less distinctly on the posterior 
tibiw; anterior inner tibial spur bifid; inner claw tooth large and near the tip; 
wings hyaline; nervures black; stigma pale, with little or no emargination above; 
second recurrent nervure received at a distance from the intersection of second and 
third cells. 
- Var. Abdomen almost entirely pale. 
Three females. Brunswick, Me. (A.S. Packard). Albany, N. Y. (Dr. Peck). 
This species, though distinct from, seems somewhat closely allied to 
my hyalinus na. sp. 
