548 PROCEEDINGS OF THE NWTlONiAiL MUSEUM vol. 93 



Male. — Unknown . 

 Type locality. — College Park, Md. 

 Types.— U.S.N.M. No. 25592. 



Host. — The chrysanthemum gall midge, Dlarthronomyia hypogaea 

 (Loew). 

 Distribution. — Maryland. 



TETRASTICHUS TIBIALIS (Ashmead) 



Tctrastichodes tibialis Ashmead, Trans. Amer. Eat. Soc, vol. 21, p. 344, 1894. 

 Titrastichus tibialis (Ashruead) Girault, Societas Entomologica, vol. 31, p. 35, 

 1916 [not Tctrastichus tibialis Kurdjumov]. 



Body very dark brown, or black with faint iridescent green reflec- 

 tions; scape and part of pedicel of antennae, apices of femora, tibiae, 

 and tarsi white. 



Female. — Length, 1.4 mm. Antennae inserted at level of ventral 

 margins of compound eyes ; apex of scape not reaching level of ante- 

 rior ocellus, three funicle segments equal in length, club slightly shorter 

 than two funicle segments combined; malar space three-fifths height 

 of compound eye ; postocellar line twice as long as ocellocular. Meso- 

 praescutum wider than long, and each lateral margin with one row 

 consisting of but three or four bristles ; submarginal vein of f orewing 

 with one dorsal bristle; apex of hindwing acute, fringe at posterior 

 margin one-half as wide as wing at hamuli. Surface of propodeum 

 roughened; median, paraspiracular, and oblique carinae present, as 

 in fig. 21, d; median length of propodeum one-third as great as length 

 of mesoscutellum ; rudimentary petiole present; propodeal spiracles 

 not quite contiguous with anterior margin ; gaster equal in length to 

 thorax. 



Male. — Length, 1.2 mm. Funicle segments enlarged near bases and 

 bearing setae slightly longer than the segments themselves; gaster 

 slightly shorter than thorax. 



Type locality. — Morgantown, W. Va. 



Types. — U.S.N.M. No. 41341. (Specimens in very poor condition.) 



Hosts. — Apanteles sp. parasitic on Apatela americana (Harris), the 

 American dagger moth; Apanteles sp. parasitic on other, undeter- 

 mined Lepidoptera. 



Distribution. — Delaware, Ontario, West Virginia. 



TETRASTICHUS SCOLYTI Ashmead 



Tetrastichus scolyti Ashmead, Trans. Amer. Ent. Soc, vol. 21, p. 343, 1894. 



Black with iridescent-green or blue-green cast; scape and ventral 

 side of pedicel and flagellum, apices of femora and tibiae, and basal 

 segments of tarsi white or yellow ; setae of head may be white ; basal 

 parts of tibiae may be lighter in color than bases of femora. 



