NO. 1866. NEW 8AWFLIE8 IN U. 8. NATIONAL MU8EUM—R0HWER. 387 



than the ocellorbital hne; antennae strongly tapermg, the third and 

 fourth joints subequal; stigma rather elongate, rounded below, 

 broadest near the base; third cubital cell very small, nearly quadrate; 

 procidentia a httle longer than wide, broadly rounded at the apex; 

 hypopygidium narrow, elongate, apex obtusely pointed. Black: 

 head, except a large spot from the crest to occipitut not reacliing 

 orbits, prothorax, tegulse, upper part of mesoepisternum, metapleur^, 

 venter and legs, except the posterior tarsi, yellowish- white ; antennae 

 all black. Wings hyahne, iridescent; venation dark brown. 



Plummer's Island, Maryland, September 1, 1907. One male col- 

 lected by A. D. Hopkins on Salix. Under the Bureau of Entomology 

 number ''Hopk.U.S.6495." 



Type.— Cat. No. 13997, U.S.N.M. 



Genus PACHYNEMATUS Konow. 



PACHYNEMATUS ALASKENSIS, new species. 

 Pachynematus ocreatus Kincaid, Proc. Wash. Acad. Sci., vol. 2, 1900, p. 347. 



Very like P. ocreatus (Harrington), but the frontal crest is broken; 

 the postocellar area is not strongly convex, and is not wider at the 

 occiput ; the third cubital cell is f uUy one-third longer than the third 

 transverse cubitus on the radius; and the tergum is marked with 

 piceous. 



Female. — Length 9 mm. Head expanding behind eyes; labrum 

 broadly rounded apically, granular; clypeus broadly, arcuately emar- 

 ginate, lobes rather pointed; supraclypeal area triangular in outline, 

 somewhat convex; middle fovea large, triangular, open above where 

 it breaks through the low crest; ocellar basin with the lateral walls 

 rounded; postocellar area well defined on all sides, not strongly con- 

 vex, not broading posteriorly; antennae long, the third joint a little 

 shorter than fourth; stigma large, angular at base, tapering to apex; 

 abdomen as ocreatus. Reddish-yellow; antennae, interocellar area, 

 lateral lobes of mesonotum laterally, metanotum, and large spots on 

 basal segments of tergum black or black piceous. Wings hyaline, 

 iridescent; venation pale brown, stigma yellowish. 



Sitka, Alaska. Three females collected April 16, by T. Kincaid 

 while on the Harriman Expedition. 



Type.— Cat. No. 13995, U.S.N.M. 



PACHYNEMATUS PICE.S:, new species. 



May be separated from P. ocreatus (Harrington), its near ally, by 

 the small, deep, nearly circular middle fovea; in ocreatus the middle 

 fovea is large and triangular. 



Female. — Length 9 mm. Head expanded behind the eyes; labrum 

 shining, depressed apically; clypeus subarcuately emarginate, lobes 



