NO. 1981. NEARCTIC SPECIES OF SAWPLIES—ROHWER. 267 



antennal furrows obsolete dorsally ; postocellar line slightly longer than 

 the ocelloccipital line ; postocellar furrow present, angulate anteriorly ; 

 postocellar area not defined laterally; fourth antennal joint shghtly 

 shorter than the fifth; head and thorax opaque, rather coarsely 

 granular; scutellum not impressed; hypopygidium broadly rounded 

 apically. Black; flagellum, tibiae and tarsi piceous; wings hyaline, 

 iridescent; venation pale brown. 



Grahams Peak, Rio de los Pinos, Colorado. Described from 

 1 female and 25 males collected May 11, 1899, on Salix flowers, by 

 C. F. Baker. 



Type.— Csii. No. 15376, U.S.N.M. 



XYELA BAKERl Konow. 



Xyela bakeri Konow, Ent. Nachr., vol. 24, 1898, p. 327. 

 Xyela negundinis Cockerell, Can. Ent., vol. 39, 1907, p. 324. 



The type of Xyela negundinis Cockerell agrees with the original 

 description of Xyela lalceri and with specimens which have been 

 determined as hakeri. The type of negundinis is in the United States 

 National Museum and is Cat. No. 15214. 



XYELA Pim, new species. 



Female. — Length to apex of the abdomen 2.25 mm.; length of 

 ovipositor 1.25 nun. Anterior margin of the clypeus with a broad, 

 large, triangularly-shaped median tooth, the surface with a faint 

 median tubercule; supraclypeal area convex; middle fovea obsolete; 

 antennal furrows obsolete dorsally (m some of the paratypes the 

 antennal furrows seem to be present although they are so strongly 

 marked with brown that this may be the confusing point); posto- 

 cellar furrow faintly indicated; postocellar line slightly shorter than 

 the ocelloccipital line; fourth antennal joint subequal in length with 

 the fifth; head and thorax subopaque, finely granular; scutellum 

 longitudinally depressed; stigma about three times as long as its 

 greatest width; sheath concave below, convex above, with the apex 

 above strongly tapering to a sharp point. Yellowish; antennae 

 metathorax above and abdomen above piceous; a spot occupying 

 the area of the middle fovea, antennal furrows, postocellar area, 

 elongate spot on the vertex between the ocellus and the eye, posterior 

 face of the head, large lateral spots on the mesoscutum, small median 

 spots on the mesoscutum, and apex of the scutellum rufo-ferruginous; 

 wings hyaline, iridescent; venation pallid brown. 



Male. — Length 2.5 mm. Anterior margin of the clypeus with a 

 large, sharp, triangularly shaped median tooth, the surface with an 

 elongate tubercule; supraclypeal area subconvex; middle fovea 

 obsolete; antennal furrows obsolete dorsally; postocellar furrow 



