99 
than twice as long as wide at base, its upper and lower sides of equal 
length; stigma oval at base, rather acute at apex; sheath narrow and 
pointed at tip, upper edge straight; cerci prominent, not tapering; 
iuner tooth of claw distinct. Color shining honey yellow; antennae., 
narrow spot connecting ocelli, line on the anterior and lateral lobes of 
mesonotum, lnesopostscutelluin, nietascutuin, center of basal plates, and 
the bases of the first six dorsal segments black or fuscous; sheath red- 
dish fuscous, almost black ; tarsi infuscated, particularly posterior pair; 
wings infuscated; veins light yellowish brown ; stigma and costa nearly 
hyaline. 
Two females, labeled "F. B." and "N". EI.," Cresson's types. (Coll. 
Am. Ent. Soc.) 
8. Pachynematus auratus new species. 
Female. — Length 8 mm. ; very robust : abdomen very much wider than 
thorax, somewhat flattened; head strongly expanding back of eyes, 
shining; clypeus distinctly but shallowly and broadly emarginate, lobes 
rounded; vertex roughened; frontal crest and lateral walls about oeel- 
lar basin rounded, indistinct, basin scarcely excavated; antennal fovea 
deep, circular, with lateral channels branching out over bases of anten- 
na'; antenme but little longer than head and thorax, slender, tapering, 
joints 3 to 5 subequal; venation normal, except that the second recur 
rent vein is interstitial, or nearly so, with the second transverse cubital, 
and the outer veins of the discal cells of the posterior wings are nearly 
interstitial; stigma broad, regularly rounded beneath; sheath rather 
narrow, slightly excavated on upper margin, rather sharply pointed at 
apex; inner tooth of claw minute, remote from apex. Color orange 
yellow; antenna', small spot on vertex including ocelli, central line on 
scutellum and basal half of same, central area of metanotum, terguin 
except narrow lateral margin, apex of sixth and all of terminal seg- 
ments, extreme bases of posterior coxa', and the outer margin of sheath 
black; tips of posterior tibiae and their tarsi infuscated; veins, includ- 
ing stigma and costa, except basal third of latter, dark brown. 
Male. — Length 6.5 mm.; much more slender than female, but less so 
than male of marylandieus; structurally much as in female; head not 
narrowing back of compound eyes; antenme long, slender, not notice- 
ably compressed; procidentia large, triangular, projecting, obtusely 
rounded at tip. Color black, shining; face below antennae, posterior 
and upper orbits, pronotum, teguhe. venter extending over dorsal edge, 
narrowly on basal segments and more broadly toward apical ones, legs 
entirely except bases of coxae, yellowish ferruginous; extreme tips of 
posterior tibia?, with tarsi, slightly infuscated; wings hyaline; veins 
colored as in female. 
Four females and two males. Montana. (Coll. Am. Ent. Soc.) 
This species is very closely allied to the last in general characteris- 
tics, but is easily distinguished from it, also from extensicornis, with 
