OP WASHINGTON, VOLUME XIII, 1911. 233 



TWO NEW HYMENOPTERA. 



BY J. C. CRAWFORD. 

 THRIPOCTENUS, new genus. 



Belongs to the tribe Tetrastichini; antenna* with two joints 

 in the funicle, one very small ring joint, club three-jointed, 

 the joints fused (fig. 2); parapsidal furrows indistinct, in- 

 complete; mesonotum without a median groove; scutellum 

 without longitudinal grooves; propodeum without a median 

 carina; spiracles round; submarginal vein very short, mar- 

 ginal vein long, stigmal short, the knob almost subsessile; 

 postmarginal vein developed (fig. 3) though not showing 

 distinctly, as it is, as are the other veins, colorless; marginal 

 fringes of anterior wings almost two-thirds as long as the 

 greatest width of the wings. 



FIG. 2. Antenna of FIG. 3. Postmarginal vein 



Ttiripoctenux. of Thripoctem/x. 



The only other genus in this tribe known to me which 

 has two joints in the funicle ( Winnemana) is readily separ- 

 ated by the presence of two longitudinal grooves on the 

 scutellum. 



Thripoctenus russelli, new species. 



Female. Length about 0.6 mm. Head and thorax black, the ab- 

 domen brown with a large basal flavous spot; head thin anterio- 

 posteriorly, collapsing after death; antennae testaceous, the pedicel 

 longer than the two joints of the funicle combined; second joint of the 

 funicle longer than the first (see fig. 2) hairs on antennae long; head 

 and thorax smooth, polished; legs including the coxae testaceous; 

 wings hyaline, the veins colorless. 



Male unknown. 



Habitat: Compton, California. 



Type: Cat. No. 14353, U. S. Nat. Mus. 



Described from specimens reared from Hcliothrlps fufdiilns 

 by H. M. Russell and J. E. Graf and sent under number 618. 



The species is named in honor of Mr. Russell, who first 

 found it. 



