112 
1881. Nematus erichsonti Hagen. Can. Ent., xii, p. 37. 
1883. Nematus erichsonii Packard. Rept. U.S. Ent., pp. 158-146. 
1883. Nematus erichsonti Packard. Bull. 5, Div. Ent., U.8. Dept. Agr., pp. 29, 30. 
1883. Nematus erichsonii Fyles: Can. Ent., xv, p. 205. 
1884. Nematus erichsonti Fletcher. Can. Ent., Xvi, pp. 215, 216. 
Iss4. Nematus erichsonii Packard. Am. Nat., XVI, pp. 293-296. 
1884. Nematus erichsonit Packard. Rept. U. S. Dept. Agric., p. 377. 
1885. Nematus erichsonii Provancher. Add. Faun, Can. Hym., p. 5. 
1885. Nematus erichsoniti Provancher. Nat. Can., Xv, pp. 38, 45-50. 
1885. Nematus erichsonii Fletcher. Rept. Dept. Agric., Ottawa, Can., p. 28. 
1886. Nematus erichsonii Harrington. Can. Ent., Xvill, p. 39. ; 
1886. Nematus erichsonit Provancher. Nat. Can., XVI, p. 32. 
1887. Nematus erichsonit Fletcher. Rept. Dept. Agric., Ottawa, Can., p. 3: 
1888. Nemalus erichsonvi Lintner. Fifth Rept. Ins. N. Y., pp. 164-173. 
1889. Nematus erichsonti Fletcher. Can. Ent., xxi, p. 152. 
1890. Nematus erichsonii Packard. Fifth Rept. U. S. Ent. Comm., p. 879. 
1890. Lygwonematus erichsonit Konow. Deutsch. Entom. Zeit., XXXIv, p. 247. 
— 
Female.—Length 11 mm.; exp. al. 22 mm.; large, moderately robust; 
head and thorax finely punctured, entire body shining; clypeus 
scarcely emarginate, almost truncate; frontal and lateral ridges of 
ocellar basin rounded, indistinct; vertex nearly smooth; antennal fovea 
long, shallow, deepest at apex; antennie about as long as head and 
thorax, rather robust, tapering, joints 3 and 4 subequal; sheath broad, 
rounded, truncate at tip; cerci flattened, somewhat tapering; inter- 
costal cross vein hyaline, indistinct, but anterior to basal and nearly at 
right angles to costa; first transverse cubital indistinct or wanting; 
stigma moderately broad, not acuminate; claw with minute inner tooth 
hear apex. Color black; tip of clypeus, palpi, basal two-thirds of 
tibiw, apices of trochanters, and extreme angles of pronotum whitish; 
femora, tips of anterior tibiw and their tarsi, first four segments of 
abdomen above and beneath except base of first segment, orange 
rufous; extreme tips of middle femora above and hind femora a little 
more broadly, tips of hind tibie and their tarsi, black; lower surface 
of antenne rufous; ves black, except costa, which is fulvous, and 
anal vein, which is whitish; wings somewhat infuscated; dusky spot in 
second cubital cell large, prominent. 
Male.—Length 8.5 to 9 mmn.; slender, elongate, abdomen not wider 
than thorax; in general, structurally as in female; procidentia strongly 
keeled, somewhat constricted basally, short, not projecting beyond the 
seventh dorsal segment; last ventral segment slightly emarginate at 
apex. Color black; antennie, three basal segments of the abdomen dor- 
sally except more or less of base of first segment, base of the fourth 
segment, all of venter of abdomen, and the legs except bases of coxie 
reddish yellow; tips of the hind tibize and the hind tarsi brownish; 
face below antennie, more or less of lower orbits, pronotum, and tegulie 
whitish; wings as in female. 
Male described from one and female from many reared specimens 
from Canada, (Coll. U.S. Nat. Mus.) Other females examined repre- 
