NORTH AMERICAN TETRASTICHUS — BURKS 549 



Female. — Length, 2.0 mm. Antennae inserted at level of central 

 margins of compound ej^es, apex of scape not quite reaching level of 

 anterior ocellus, funicle segments long, first one and one-half times 

 as long as pedicel, second one and two-thirds as long as pedicel and 

 third one and one-third times as long as pedicel, club twice as long as 

 pedicel; malar space two-thirds height of compound eye; postocellar 

 line one and one-third times as long as ocellocular. Mesopraescutum 

 as long as wide and bearing one row of bristles at each lateral margin : 

 submarginal vein of forewing with one dorsal bristle; apex of hind- 

 wing blunt, fringe at posterior margin one-fifth as wide as wing at 

 hamuli. Propodeum shagreened, mesal length one-third length of 

 mesoscutellum, both median and paraspiracular carinae present, 

 spiracles separated from anterior margin by a space equal to one- 

 half length of a spiracle; gaster one and one-third times as long as 

 thorax. 



Male. — Unknown . 



Type locality. — Morgantown, W. Va. 



Types.— U.S.N.M. No. 41339. (Specimens in very poor condition.) 



Host. — The shot-hole borer, Scolytus rugulosus Ratzeburg. 



Distribution. — New Jersey, West Virginia. 



TETRASTICHUS AGRiLI Crawford 



Tetrastichus agrili Crawfoed, Insecutor Iuscitiao Menstruus, vol. 2, p. 181, 1914. — 

 Leonard, New York (Cornell) Agr. Exp. Stat. Mem. 101, p. 984, 1928. 



Black, with iridescent blue-green cast; mouthparts, scape, tro- 

 chanters, tibiae, and tarsi white or light yellow. 



Female. — Length, 3.0 mm. Antennae inserted at level of ventral 

 margins of compound eyes; apex of scape reaching level of anterior 

 ocellus, first funicle segment one-fifth longer than second, third five- 

 sixths as long as second, club one and two-thirds times as long as 

 third funicle segment; malar space two-thirds height of compound 

 eye ; postocellar line twice as long as ocellocular line. Pronotum with 

 well-defined femoral grooves, as in figure 17, e; mesopraescutum as 

 long as wide and bearing a single row of bristles at each lateral mar- 

 gin ; submarginal vein of forewing with a single dorsal bristle ; apex 

 of hindwing blunt, fringe at posterior margin one-sixth or one-seventh 

 as wide as wing at hamuli. Propodeum shagreened, mesal length 

 one-fourth as great as length of mesoscutellum, both median and 

 paraspiracular carinae present; spiracles almost touching anterior 

 margin of propodeum; gaster long, narrow, acutely pointed, twice as 

 long as thorax. 



Male. — Unknown. 



Type locality. — Geneva, N. Y. 



Types.— U.S.N.M. No. 19068. 



