NORTH AMERICAN TETRASTfoCHUS — BURKS 551 



eye; postocellar line one and one-half times as long as ocellocular. 

 Mesopraescutum as long as wide, with one row of bristles at each 

 lateral margin; submarginal vein of forewing with one dorsal bristle; 

 hindwing blunt at apex, fringe at posterior margin one-fourth as wide 

 as wing at hamuli. Surface of propodeum roughened; mesal length 

 of propodeum three-eighths length of mesoscutellum ; median, para- 

 spiracular, and short, oblique carinae present, much as in figure 21, d; 

 rudimentary petiole present; propodeal spiracles separated from an- 

 terior margin by a space equal to one-half length of a spiracle ; gaster 

 twice as long as thorax. 



Male. — Length, 1.5 mm. Darkened anterior carina of scape two- 

 thirds as long as scape; first funicle segment four-fifths as long as 

 second segment, three distal segments equal in length, funicle segments 

 enlarged near bases and bearing long setae, club as long as first three 

 funicle segments ; gaster equal in length to thorax. 



Type locality. — Cadet, Mo. 



Types.— U.S.N.M. No. 2796. 



Host. — The Hessian fly, Phytophaga destructor (Say). (May be 

 incorrect.) 



Distribution. — Missouri. 



TETRASTICHUS PARACHOLUS, new species 



Very dark brown or black, with faint brassy iridescence ; scape and 

 apex of pedicel of antenna, apices of coxae, bases and apices of femora, 

 tibiae, and tarsi white or light yellow. 



Female. — Length, 1.5-1.8 nun. Entire body long and narrow. An- 

 tennae inserted at level of ventral margins of compound eyes ; apex of 

 scape not quite reaching level of ventral margin of anterior ocellus; 

 first funicle segment slightly longer than second, second and third 

 funicle segments equal in length and their combined lengths equal to 

 that of club ; ocellocular line two-thirds as long as postocellar. Meso- 

 praescutum bearing one row of bristles at each lateral margin; sub- 

 marginal vein of forewing with one dorsal bristle ; apex of hindwing 

 blunt, fringe at posterior margin slightly less than one-third as wide as 

 wing at hamuli; entire surface of thoracic pleuron reticulated; meta- 

 coxae shagreened near base, smooth at apex. Surface of propodeum 

 shagreened, strong median and paraspiracular carinae present; mesal 

 length of propodeum one-third as great as length of mesoscutellum; 

 propodeal spiracles separated from anterior margin by a space one- 

 half as great as diameter of a spiracle ; rudimentary petiole present, its 

 dorsal surface faintly reticulated; gaster elongate, narrow, longer 

 than thorax. 



Male. — Length, 1.5 mm. Funicle segments enlarged near bases and 

 provided with long setae; pedicel and first funicle segment equal in 



