6 E. T. CRESSON. 



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recurrent nervure less than one-third from base, the second coinciding with 

 second transverso-inedian nervure, third submarginal cell three-fourths the 

 length of the second, widened to apex; base of coxse and of femora more or 

 less black, tips of posterior tibise and the tarsi dusky. Length .25— .30 inch. 

 JIa/j. — Nevada, (Morrison). Allied to stibalbatus Norton. 



IVemaf IIS luteipes. — 9 • — Subrobust, black, shining, subsericeous ; most 

 of clypeus, labrum, base of mandibles, posterior orbits and spot beneath eyes, 

 dull whitish; clypeus deeply eniarginate; antennre slender, more than half 

 the length of the body, three basal joints of flagellum of nearly equal length; 

 posterior angles of prothorax and tegulse pale; wings faintly dusky, iridescent, 

 nervures and stigma black, the latter streaked with pale fuscous, neuration as 

 in vicinalis except that the third submarginal cell is much shorter, being nearly 

 square, externo-median and second submarginal cells each with a black dot: 

 legs luteous, base of coxse, line at base of four anterior femora above, line on 

 posterior femora above, black; posterior tibise behind and their tarsi dusky; 

 abdomen robust, subcompressed, longer than head and thorax; venter varied 

 with dull testaceous. Length .25 inch. 

 Huh. — Nevada. (Morrison). 



IVeinatus Diiiiniockii. — 9 • — Shining black ; cheeks pale piceous; face, 

 clypeus and labrum, pale; antennse about half the length of the body, slender, 

 three basal joints of flagellum of nearly equal length; the third rather shorter 

 than the fourth; thorax with pale sericeous pubescence; posterior angles of 

 mesothorax and tegulse luteous; wings hyaline, nervures and stigma blackish, 

 second submarginal cell receiving the first recurrent nervure before the middle, 

 the second coinciding with the second transverso-median nervure, third sub- 

 marginal cell nearly one-third shorter than the second; one wing has the 

 middle third of the second transverso-median nervure obliterated, while 

 on the other it is entirely wanting; legs fulvo-luteous, base of the coxse, 

 extreme tips of posterior tibiae and most of the tarsi black or fuscous; abdo- 

 men robust, piceous, sides of dorsal segments stained with rufo-testaceous. 

 Length .36 inch. 



Hah. — Near Summit of Mt. Washington, N. H., (Geo. Dinimock). 



Nematus nigropectus.— 9 •— Black, shining; the face beneath the 

 antennse, broad posterior orbits, dilated above at summit of eyes, clypeus, 

 labrum, mandibles except tips, palpi, prothorax, tegulse and large subtriangular 

 mark on sides of pleura, all white; antennse more than half the length of the 

 body, slender, the three basal joints of the flagellum of nearly equal length, 

 the first being rather the shortest; wings hyaline, iridescent, slightly dusky 

 towards apex, nervures black, stigma fuscous, neuration as in vicinalis; legs 

 white, base of posterior coxse, extreme tips of their tibise and their tarsi en- 

 tirely, black; abdomen subcompressed, yellowish-white, basal plates, and band 

 at base of dorsal segnienls, black. Length .32 inch. 

 Hah. — Nevada, (Morrison). Allied to ventralis. 



IWematus pallifrons.— 'J, .— Small, subrobust, black, shining, head 

 broad; face, bioad anierior and posterior orbits, interrupted near summit 

 •within, clypeus, labrum, mandibles except tips, palpi, prothorax, tegulse and 

 pleura entirely, except upper margin immediately beneath wings, all yellowish- 



