108 
except base of first segment dorsally, yellowish ferruginous; the tarsi 
and the extreme apices of the posterior tibiae, pronotum, and teguhe are 
distinctly infuscated; veins yellowish brown, stigma and costa lighter, 
but distinctly infuscated; wings distinctly smoky, especially centrally; 
small spot in center of the median and of the second cubital cell. 
One male. Agricultural College, Mich. (Coll. IT. S. Nat. Mus.) 
27. Pachynematus thoracicus new species. 
Male. — Length 6 mm.; rather robust, head expanding back of com- 
pound eyes; antenna' slender, cylindrical, filiform, not compressed; 
clypetis broadly em ar gin ate, lobes rather pointed; pentagonal ridges 
sharply raised; antenna! fovea divaricating over bases of antennae; 
second recurrent and second cubital and outer veins of discal cells of 
posterior wings interstitial; stigma broad; claws with very minute 
inner tooth; procidentia very broad, protruding, tapering to roundly 
truncated apex. Color luteous ferruginous; antennae, triangular spot 
beneath, Large spot on vertex extending nearly to base of antennae and 
posteriorly to occiput, center of lateral lobes of mesonotum, small 
spot at apex of scntellum, central area of metanotum, including all of 
basal plates and the abdomen dorsally and ventrally except apex, 
black; thorax beneath and legs entirely yellowish ferruginous; wings 
hyaline; veins light brown; costa and stigma yellow, nearly hyaline. 
One male. Montana. (Coll. Am. Ent. Soc.) 
In characters of head and antenna' and notably also in Colorational 
features this species agrees with remarkable closeness with the female 
of (ifjiiiis, and departs just as widely in these particulars from the male 
of that species. Then' is a possibility, therefore, that it is a hermaph- 
roditic form. 
28. Pachynematus koebelei new species. 
Male. — Length mm.; slender, elongate; head not expanding back 
of compound eyes, or slightly narrowed; clypens shallowly emarginate; 
vertex roughened with minute, dense tubercles; ocellar basin with indis- 
tinct limiting walls; frontal crest low and scarcely developed; antennal 
fovea circularly, deeply excavated; antenna' longer than head and tho- 
rax, tapering, strongly compressed, joints 3 and 4 subequal; proci- 
dentia narrow, protruding nearly twice its width, strongly keeled, 
rounded at apex; hypopygium very obtusely rounded at apex, short; 
claws with minute inner tooth remote from apex; venation normal; 
stigma moderately broad, widest at center. Color black, shining; 
apical half of femora, tibiae, and tarsi reddish ferruginous, more or less 
infuscated, particularly extreme tips of posterior tibia' and their tarsi; 
veins dark brown, almost black, including stigma, and costa. 
One male. Oregon. (Coll. U. 8. Nat. Mus.) 
