268 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 4n. 



indicated; postocellar area defined laterally by faint furrows; posto- 

 cellar line subequal with the ocelloccipital line; fourth and fifth 

 antennal joints subequal; scutellum with a longitudmal impressed 

 line; hypopygidium broadly rounded apically. Yellow; markings as 

 in the female. 



Call, Texas. Two females and fifteen males collected February 

 28, 1905, by W. F. Fiske. Recorded under ''Bureau of Entomology 

 Number Hopk, U. S. 3433a," which is connected with a note saying 

 that these insects literally swarmed about a single tree of Pinus 

 palustris. 



Type.— C&t. No. 15377, U.S.N.M. 



XYELA ALNI, new species. 



Female. — Length to the apex of the abdomen 3 mm. ; length of the 

 ovipositor 2 mm. Clypeus carinate to the apex with a small median 

 tooth ; supraclypeal area flat ; middle fovea obsolete ; antennal furrows 

 obsolete dorsally; postocellar area not defined; postocellar line 

 slightly longer than the ocelloccipital line; head and mesonotum 

 subopaque, finely granular; fourth and fifth antennal joints sub- 

 equal; stigma about- twice as long as its greatest width; sheath 

 below straight, with apex above sharply oblique. Black; palpi, 

 antennae and legs piceous; wings hyaline, iridescent; venation pale 

 brown. 



Male. — Length 2.75 mm. Clypeus with a median tubercule, the 

 anterior margin with a large, triangularly shaped median tooth; 

 punctuation and aulation of the head as in the female ; hypopygidium 

 regularly, rather broadly rounded to the apex. Black; palpi, flagel- 

 lum, tibise and tarsi pale piceous; wings hyaline, iridescent; venation 

 very pale brown. 



Great Falls, Virginia. Described from 2 females and 4 males 

 collected March 20, by Nathan Banks. Some of them labeled as 

 commg from flowers of alder (Alnus) . 



Type.—Csit. No. 15378, U.S.N.M. 



XYELA WINNEMAN^, new species. 



Female. — Length to the apex of the abdomen 3 mm.; length of the 

 ovipositor 2 mm. Clypeus carinate to the apex and with a median 

 tooth; antennal furrows obsolete dorsally; the middle fovea repre- 

 sented by a large, shallow depression ; postocellar furrow well defined 

 but the postocellar area is not defined laterally; postocellar line 

 subequal with the ocellocular line; head and thorax shining, finely 

 granular; fourth antennal joint slightly shorter than the fifth; 

 stigma sharply tapering beyond the first transverse radius, about 

 two and one-half times as long as its greatest width; sheath straight 

 above and below, but the apex above sharply oblique ; wings hyalme, 



