98 
lobes rounded; vertex roughened j lateral walls of ocellar basin irregu- 
lar, not very distinctly raised; frontal crest rather sharply but not 
strongly developed, unbroken: autennal fovea shallow, extending widely 
over bases of antenna 1 ; antenna' 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 
discal 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 minute, remote from 
apex. Color luteous; antenna 1 , small spot including ocelli, spot on 
lateral lobes of mesonotum, spot on either side and apex of seutellum, 
postscutellum and central region of metanotum, basal plates, terguin 
(except lateral margins and last two segments), and sheath black; 
apical margins of segments yellow in the lighter specimens; extreme 
apices of hind tibiae, the hind tarsi, bases of posterior coxae, and small 
spot beneath anterior wings intuscated: stigma, costa, upper edge of 
subcosta, and bases of all veins reaching the body hyaline; other veins 
brown. 
Male. — Length (> 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; antennnl fovea circular, shal- 
low, extending laterally over bases of antennae ; antennae 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 tibiae and tarsi, ami extreme apex of abdomen, 
particularly hypopygium, yellowish ferruginous, more or less fnfuscated, 
particularly at apices of posterior tibia' and all of tarsi: veins brown; 
stigma and costa light brown. 
Eight females and four males. Montana. (Coll. Am. Ent. Soc.) 
7. Pachynematus suadns Cresson. 
1880. Xematus suadns Cresson. Trans. Am. Ent. Boo., vm, j>. 10. 
1886. Xematus suadns Provancher. Add. Faun. Can. Hyni.. 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 
