132 
mouth yellow; antenne longer than the moiety of the body, filiform, black; border 
of the corselet brown; two longitudinal lines on the thorax; scutel and the greater 
part of the thorax of a chestnut brown; abdomen convex, shining black; wings 
longer than the body, wide, transparent; stigma and costa yellow; nervures brown; 
marginal cell simple, extending almost to the tip; three discoidal cells; legs yellow; 
a long black spot under the anterior femora; posterior femora black, at the extrem- 
ity yellow. 
Isle of Unalaska, Russian America. Not seen (Norton). 
20. Nematus suratus Fitch. 
1856. Nematus suratus Fitch. 3d Rept. N. Y. Agr. Soc., p. 315, No. 94. (3rd Rept. 
Ins N. Yi, p.-68:) 
1861. Nematus suratus Norton. Proc. Bost. Soc. Nat. Hist., vit, p. 159. 
1867. Nematus suratus Norton. Trans. Am. Ent. Soc., 1, p.196. (Cat., ete, p. 60.) 
Black, with four transparent, slightly smoky wings; mouth, cloud-like spot on the 
shoulders, edges of abdominal segments, and legs livid white; the four anterior 
thighs being black upon their undersides and the hinder pair wholly black, except 
at their base; length 0.25 inch; to the tip of wing 0.30 inch. 
New York. Not seen (Norton). 
Food-plant, cherry. 
21. Nematus trifurcatus Kirby. 
1882. Nematus trifurcatus Kirby. List Hym. Brit. Mus., 1, p. 148. 
Exp. al. 8 lin.; long. corp. 4 lin. 
Female.—Testaceous; antenne black; a large square black spot on vertex; three 
large black spots in front and on the sides of the thorax, sometimes nearly confluent; 
hinder half of the scutellum black; all the segments of the abdomen except the last 
(beyond which the black tips of the saws and sheaths project) are more or less 
broadly banded with purplish black in the middle; sides and under surface testa- 
ceous; fectus black in the middle; a black line down the hind legs; wings hyaline; 
nervures piceous; stigma yellowish; three submarginal cells. 
This species appears to be allied to NV. crassus Esch. (obtusus Kirby), from Alaska. 
Hudson Bay, St. Martin’s Falls, Albany River. 
22. Nematus abbotii Kirby. 
1882. Hypolepus abbotii Kirby. List Hym. Brit. Mus., pp. 324-325. 
Exp. al. 11 lin.; long. corp. 6 lin. 
Female.—Blue black, shining; third segment of abdomen testaceous on the sides, 
and less distinctly so above; wings iridescent, clear hyaline toward the base, and 
more dusky beyond, with blackish nervures. 
North America (Georgia). Probably from Abbott’s collection. 
