98 
lobes rounded; vertex roughened; lateral walls of oeellar basin irregu- 
lar, not very distinctly raised; frontal crest rather sharply but not 
strongly developed, unbroken; antennal fovea shallow, extending widely 
over bases of antennie; antenne considerably longer than head and 
thorax, very slender, tapering, joint 4 as long as or longer than 3; 
second recurrent interstitial with second transverse cubital; upper 
diseal cell of hind wings very slightly exceeding lower, venation other- 
wise normal; stigma broad, regularly rounded on lower margin; sheath 
rather narrow, tapering, straight on upper margin, obtusely pointed; 
cerci long, slender, filiform; inner tooth of claw minate, remote from 
apex. Color luteous; antennie, small spot including ocelli, spot on 
lateral lobes of mesonotum, spot on either side and apex of scutellumn, 
postscutellum and central region of metanotum, basal plates, tergum 
(except lateral margins and last two segments), and sheath black; 
apical margins of segments yellow in the lighter specimens; extreme 
apices of hind tibiz, the hind tarsi, bases of posterior cox, and small 
spot beneath anterior wings infuscated; stigma, costa, upper edge of 
subcosta, and bases of all veins reaching the body hyaline; other veins 
brown. 
Male.—Length 6 mm.; not very robust, shining, head expanding 
beyond compound eyes posteriorly ; clypeus scarcely emarginate, nearly 
truncate; vertex roughened; walls about ocellar basin rounded, indis- 
tinct, basin narrowly excavated at center; antennal fovea circular, shal- 
low, extending laterally over bases of antennwe; antenn long, tapering, 
cylindrical, basal joints slightly compressed, joints nodose at tip, fourth 
longest; venation normal, except that the second recurrent and second 
transverse cubital and the outer veins of discal cells of hind wings are 
interstitial; stigma moderately broad, rounded beneath, tapering or 
acuminately pointed; procidentia projecting only about half its width, 
broadly truncate at apex; claws with minute inner tooth remote from 
apex. Color black; clypeus, mouth parts, upper and posterior orbits, 
apices of femora, the tibiz: and tarsi, and extreme apex of abdomen, 
particularly hypopygium, yellowish ferruginous, more or less infuscated, 
particularly at apices of posterior tibive and all of tarsi; veins brown; 
stigma and costa light brown. 
Hight females and four males. Montana. (Coll. Am. Ent. Soc.) 
7. Pachynematus suadus Oresson. 
1880. Nematus swadus Cresson. ‘Trans. Am. Ent. Soc., VI, p. 10. 
1886. Nematus suadus Provancher. Add. Faun. Can. Hym., p. 24. 
Female.—Length 6.5 mm.; very short and robust; head strongly 
expanding posteriorly to compound eyes; clypeus broadly and _ shal- 
lowly excavated; frontal crest and sides of ocellar basin indistinct; 
vertex somewhat roughened; antennal fovea almost wanting; second 
recurrent interstitial with second transverse cubital; discal cells of 
hind wings of about equal length; third cubital cell but little more 
