292 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 58. 



Female. — Length, 2.5 mm.; antennae (broken). 



Body shining, granular; scutellum, and apical tergites subpohshed, 

 the sculpture weak, former \\ith a few punctures; abdomen broad, 

 rounded at apex; ovipositor subequal in length to second tergite. 



Black; upper and lower anterior orbits and mouth brownish; legs 

 blackish with articulations paler; wings only very indistinctly brown- 

 stained, venation very dark brown; abdomen entirely black. 



Male. — Much like female; abdomen rather broader than usual. 



Host. — Euxoa, species. 



Type locality. —YeTual, Utah. 



Type.— Cat. No. 22870, U.S.N.M. 



One female and three males reared by S. J. Snow on June 7 and 19, 

 1916, under Webster No. 16615. The type, allotype, and paratype 

 a also bear the cage No. 2026 I. A, while paratype h is labeled 2026 

 A.B.U. In the allotype, the only specimen having an entire antenna, 

 this is rather stout filiform and 25-jointed. 



(TRACHYUSA) HABROBRACON AMERICANA (Ashmead) Gahan. 



In my key to North American species runs to couplet 5, but differs 

 from the two species falling there and from erucarum Cushman 

 described above in having the malar space yqtj long and the cheeks 

 perfectly straight, the head in front view having a somewhat 

 Agathidine appearance. 



