106 
remote from apex. Color black; tips of elypeus, labrum, angles of pro- 
notum, tegulee, coxie except bases, trochanters, bases of femora and 
tips of anterior pairs, tibizee except tips of posterior pair, anterior tarsi 
and venter except laterally at base and apex pallid; palpi fuscous; 
sheath and cerci black; stigma and veins dark brown, except base of 
costa, which is lighter. 
Male.—Length 6.5 mm.; slender; head much narrowed back of com- 
pound eyes; structurally for the most part as in female; antenne large 
and strongly compressed, tapering; procidentia short, narrow, trun- 
eate. Color black; tips of clypeus and mouth parts otherwise, angles 
of pronotum, venter and legs except extreme bases of coxie, extreme 
tips of posterior tibia, and all posterior tarsi yellowish ferruginous; 
venter more or less infuscated laterally and apically (in a specimen from 
Michigan altogether dark fuscous). 
Three females and two males. Massachusetts, Pennsylvania, and 
Michigan. (Colls. Am. Ent. Soc. and U. 8. Nat. Mus.) 
The reference of the males to this species is made with considerable 
doubt on general resemblance and correspondence in habitat. 
23. Pachynematus palliventris Cresson. 
1880. Nematus palliventris Cresson. Trans. Am. Ent. Soc., V1, p.5. 
1894. Nematus pallidiventralis Dalla Torre. Cat. Hym., I, p. 248. 
Female.—Length 6 mm.; moderately robust, shining; head as wide as 
thorax, quadrangular, vertex tuberculate; clypeus broadly and gently 
emarginate; frontal crest distinctly elevated, unbroken, extending 
nearly to orbits; sides of ocellar basin rounded, not strongly raised, 
indistinct; antennal fovea large, circular, deeply excavated; antenne 
longer than head and thorax, rather slender, tapering, joint 3 longest; 
venation normal; stigma robust, broadest about middle; sheath rather 
slender, somewhat pointed at tip, dorsal margin nearly straight; cerci 
minute, filiform; inner tooth of claw minute, obtuse, remote from apex. 
Color black; labrum, bases of mandibles, angles of pronotum, tegulie, 
coxie except bases, trochanters, tibiwe of anterior pairs of legs and 
their tarsi, and venter of abdomen yellowish, inclined to pallid, espe- 
cially on abdomen; femora brown, posterior ones darkest; posterior 
tibive and tarsi decidedly infuscated, especially tips of the tibiwe and 
the tarsi; more or less of the dorsal segments are narrowly yellow on 
the posterior margin and the lateral edges are yellow, also base of 
pygidium, including cerci; sheath black; wings hyaline; veins, includ- 
ing costa and stigma, brown. 
One female, Cresson’s type. Nevada. (Coll. Am. Ent. Soc.) 
24, Pachynematus tritici new species. 
Male.—Length 5.5 mm.; not very robust, head not narrowing back 
of compound eyes; clypeus rather deeply, somewhat angularly emargi- 
