108 
except base of first segment dorsally, yellowish ferruginous; the tarsi 
and the extreme apices of the posterior tibive, pronotum, and tegulie are 
distinetly infuscated; veins yellowish brown, stigma and costa lighter, 
but distinetly 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. U.S. Nat. Mus.) 
27. Pachynematus thoracicus new species. 
Male—Length 6 mm.; rather robust, head expanding back of com- 
pound eyes; antenne slender, cylindrical, filiform, not compressed ; 
elypeus broadly emarginate, lobes rather pointed; pentagonal ridges 
sharply raised; antennal fovea divaricating over bases of antenne ; 
second reeurrent and seeond 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; antenne, triangular spot 
beneath, large spot on vertex extending nearly to base of antenna and 
posteriorly to oeciput, center of lateral lobes of mesonotum, small 
spot at apex of seutellum, 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 antennz and notably also in colorational 
features this species agrees with remarkabie closeness with the female 
of afinis, and departs just as widely in these particulars from the male 
of that species. There is a possibility, therefore, that it is a hermaph- 
roditic form. 
28. Pachynematus koebelei new species. 
Male.—Length 6 mm.; slender, elongate; head not expanding back 
of compound eyes, or slightly narrowed; elypeus shallowly emarginate; 
vertex roughened with minute, dense tubercles; ocellar basin with indis- 
tinet limiting walls; frontal crest low and scarcely developed; antennal 
fovea circularly, deeply excavated; antenne longer than head and tho- 
“ax, 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, tibie, and tarsi reddish ferruginous, more or less 
infuscated, particularly extreme tips of posterior tibize and their tarsi; 
veins dark brown, almost black, including stigma and costa. 
One male. Oregon. (Coll. U.S. Nat. Mus.) 
