584 PROCEEDINGS OF THE NAfTlONAiL MUSEUM vol. 93 



space one-half height of compound eye ; postocellar line twice as long 

 as ocellocular. Mesopraescutum as wide as long and bearing one and 

 a partial second row of bristles at each lateral margin ; prepectus retic- 

 ulated, rest of mesopleuron smooth, submarginal vein of forewing 

 with two to four dorsal bristles; mesoscutellum either with two or 

 three pairs of bristles; hindwing blunt at apex, fringe at posterior 

 margin usually one-fifth as wide as wing at hamuli (fig. 20, i) . Sur- 

 face of propodeum faintly sculptured, strong median carina present, 

 paraspiracular carinae absent; mesal length of propodeum one-fourth 

 as great as length of mesoscutellum; propodeal spiracles not quite 

 touching anterior margin ; gaster from one-quarter to one-third longer 

 than thorax. 



Male. — Length, 1.5 mm. First funicle segment two-thirds as long 

 as second, second to fourth equal in length ; pedicel and first funicle 

 segment equal in length ; club as long as third and fourth funicle seg- 

 ments combined; setae borne by funicle segments twice as long as 

 segments ; gaster as long as thorax. 



Type locality. — Anna, 111. 



Types. — Female lectotype and one female paratype in Illinois Na- 

 tural History Survey collection. 



Hosts. — Phytophaga destructor (Say) , the Hessian fly ; Phytophaga 

 phalaris (Barnes). 



Distribution. — Probably worldwide; generally distributed in the 

 wheat-growing areas of the United States, except those immediately 

 west of the Mississippi River. 



TETRASTICHUS REPULSUS Girault 



Tetrastichus repulsus Girault, New chalcid flies, p. 4, 1917. 



Iridescent blue-green or purple; pedicel or entire antenna, tro- 

 chanters partly, apices of femora, tibiae, and tarsi light yellow or 

 white. 



Female. — Length, 1.9-2.8 mm. Antennae inserted at level of ven- 

 tral margins of compound eyes; apex of scape reaching level of ver- 

 tex; first funicle segment one-half longer than pedicel, second and 

 third segments equal in length and each one-fifth shorter than first; 

 club as long as pedicel and first funicle segment; length of malar 

 space two-thirds as great as height of compound eye ; postocellar line 

 slightly more than twice as long as ocellocular. Mesopraescutum wider 

 than long, and bearing two rows of bristles at each lateral margin; 

 submarginal vein of forewing with three or four dorsal bristles ; apex 

 of hindwing blunt, width of fringe at posterior margin one-fifth as 

 great as width of wing at hamuli. Surface of propodeum almost 

 smooth, showing very faint reticulations under strong light ; length of 

 mesoscutellum three and one-half times as great as mesal length of 



