NORTH AMERICAN TETRASTICHUS — BURKS 563 



near anterior margin of segment. Surface of propodeum smooth, 

 median carina only present; mesal length of propodeum one-third 

 length of mesoscutellum ; propodeal spiracle round, minute, separated 

 from anterior margin by a space equal to diameter of a spiracle; 

 gaster equal in length to thorax. 



Male. — Length, 0.8 mm. Scape broadened from base to apex and 

 bearing a long, darkened anterior carina; funicle segments semi- 

 quadrate and without long bristles, club two and one-half times as 

 long as fourth funicle segment. 



Type locality. — Coalburg, W. Va. 



Types. — U.S.N.M. No. 2677. (Specimens in poor condition.) 



Hosts. — Apanteles atalantae (Packard) parasitic on the red admiral 

 butterfly, Vanessa atalanta (Linnaeus), and Apanteles sp. parasitic 

 on the semicolon butterfly, Polygonia interrogationis (Fabricius) ; 

 Apanteles sp. parasitic on the grape leaf folder, Desmia funeralis 

 Huebner. 



Distribution. — Iowa, Maryland, Ohio, Virginia, West Virginia. 



TETRASTICHUS PATTERSONAE Fullaway 

 FlGUEE 16, C 



Tetrastichus pattersonae Fullaway, Journ. New York Ent. Soc, vol. 20, p. 280, 

 1912. 



Bright, iridescent green or blue-green ; antennae, trochanters, apices 

 of femora, tibiae, and basal segments of tarsi light yellow or white. 



Female. — Length, 1.9-2.2 mm. Antennae inserted at level of ven- 

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

 ocellus; funicle segments globular, second and third segments equal 

 and each slightly shorter than first, all funicle segments equal in width ; 

 club as long as first and second funicle segments combined ; length of 

 malar space two-thirds height of compound eye ; malar furrow form- 

 ing a triangle with ocular suture just ventrad of compound eye (fig. 

 16, c), ocellocular line two-thirds as long as postocellar. Mesoprae- 

 scutum wider than long, entire surface densely covered by bristles, as 

 in figure 19, e ; submarginal vein of f orewing with five or six dorsal 

 bristles ; surface of entire mesopleuron reticulated ; apex of hindwing 

 blunt, fringe at posterior margin one-ninth width of wing at hamuli ; 

 longitudinal grooves of mesoscutellum sometimes vague. Surface of 

 propodeum lightly shagreened, paraspiracular carinae absent, mesal 

 length of propodeum one-third length of mesoscutellum, propodeal 

 spiracles almost touching anterior margin, one pair of submesal bristles 

 usually present at posterior margin of propodeum ; gaster one-fourth 

 longer than thorax. 



Male.— Length, 1.8-2.0 mm. First funicle segment three-fifths as 

 long as pedicel, second to fourth funicle segments equal in length and 



