94 
INDEX TO SPECIES OE PACHYNEMATUS— COUtillued. 
minutus n. sp. $ 32 punctulatus n. sp. 9 18 
inonti vagus li. sp. '$ 12 robustus u. sp. 9 14 
uevadensis n. sp. $ 33 ruralis Cresson 9 27 
nigropectus Cresson 9 17 suadus Cresson 9 7 
occidentalis n. sp. $ 29 subalbatus Norton $ 9 22 
ocreatus Harrington 9 3 thoracicus n. sp. $ 27 
palliventris Cresson 9 23 tritici n. sp. $ 24 
pleuricus Norton 9 10 wrangeli n. sp. $ 31 
pubescens n. sp. 9 11 
1. Pachynematus dimmockii Cresson. 
1880. NematuB dimmockii Cresson. Trans. Am. Ent. Soc, VIII, p. 6. 
Female. — Lengths mm.; exp. al. 18 mm.; rather robust, elongate, 
shining; clypeus deeply emarginate, lobes triangular, rounded, and with 
labruni clothed with long hairs; frontal crest and lateral walls of ocel- 
lar basin distinctly but not strongly elevated, former slightly broken at 
middle; antennal fovea shallow, indistinct; antenna' slender, as long as 
head and thorax, fourth joint much longer than third; second recurrent 
vein interstitial with second transverse cubital; outer veins of discal 
cells of hind wings interstitial; stigma rather broad, ovate or some- 
what tapering; sheath Aery long, rounded at apex, projecting free one- 
half its length, blades thin and closely applied; cerci long, very slen 
der, filiform; inner tooth of claw near apex rather broad. Color brown- 
ish black; abdomen lighter, inclined to fulvous; face below antennas, 
upper and posterior orbits, pronotum, teguhe, and legs except bases of 
coxae, reddish yellow, strongly infuscated, particularly posterior tibia} 
and all the tarsi; veins, including stigma, dark brown. 
One female, Cresson' s type. Collected by Mr. George Dimmock near 
the summit of Mount Washington, New Hampshire. (Coll. Am. Ent. 
Soc.) 
2. Pachynematus ruralis Cresson. 
1880. Xematux ruralis Cresson. Trans. Am. Ent. Soc., VIII, p. 5. 
Female. — Length 8 mm.; head strongly developed back of compound 
eyes; clypeus angularly incised, lobes broad and rounded; ridges 
about anterior ocellus wanting; pentagonal area smooth, not depressed; 
antenna! fovea sharply defined anteriorly; antenna} short, slender, 
joints 4 and 5 subequal and slightly longer than 3; intercostal vein 
nearly interstitial with basal; second cubital and second recurrent 
interstitial or nearly so, as also the outer veins of discal cells of hind 
wings; sheath very prominent, elongate, projecting free one-half its 
length, regularly tapering on both margins to rounded apex, blades 
thin, closely applied; cerci very slender, filiform; inner tooth of claw 
very minute. Color brownish black; orbits except narrow inner mar- 
gins, face below base of antenna?, pronotum, tegulai, abdomen beneath, 
