NORTH AMERICAN TETRASTICHUS — BURKS 583 



notum with distinct femoral grooves, as in figure 17, e ; mesopraescutum 

 with surface almost smooth, obscure, somewhat longitudinal sculptur- 

 ing discernible, one row of bristles present at each lateral margin; 

 submarginal vein of f orewing with four or five dorsal bristles, marginal 

 vein four times as long as stigmal ; apex of hindwing blunt, fringe at 

 posterior margin one-fifth as wide as wing at hamuli; postscutellum 

 somewhat flattened at meson. Surface of propodeum faintly sculp- 

 tured, almost smooth, median carina only present; mesal length of 

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

 contiguous with anterior margin of propodeum ; gaster from one and 

 one-third to one and one-half times as long as thorax. 



Male. — Length, 1.4-2.0 mm. Anterior carina of scape short, located 

 near apex; pedicel slightly longer than first funicle segment, second 

 segment twice as long as first, third and fourth equal in length and 

 each slightly longer than second; club as long as two distal funicle 

 segments combined ; funicle segments bearing conspicuously long bris- 

 tles on enlargements near bases of segments ; marginal vein three times 

 as long as stigmal ; gaster as long as thorax. 



Type locality. — Claremont, Calif. 



Types.— U.S.N.M. No. 5G256. 



Described from the female holotype, male allotype, and 15 female 

 and 12 male paratypes reared from a "cup gall" on white sage {Ar- 

 temisia Ivdoviciana) , January 25-February 22, 1923, by J. G. Needham. 



Host. — The host of this species possibly is Diarthronomyia occiden- 

 talls (Felt). 



TETRASTICHUS CARINATUS Forbes 



Figtojes 16, d; 20, i 



Tetrastichus carinatus Forbes, Illinois State Ent. Rep, 1885, p. 48. — Gahan, U. S. 



Dept. Agr. Misc. Publ. 174, p. 138, 1933 (this paper includes a bibliography 



complete through 1932). — Rockwood and Reeheb, U. S. Dept. Agr. Techn. 



Bull. 361, p. 18, 1933.— Hixl, Pinckney, and Udine, U. S. Dept. Agr. Techn. 



Bull. 689, p. 12, 1939.— Hill and Pinckney, U. S. Dept. Agr. Techn. Bull. 715, 



p. 10, 1940. 

 Tetrastichus rileyi Lindemann, Bull. Soc. Nat. Moscou, ser. 2, vol. 1, p. 183, 1887. 



Body light to dark brown, sometimes black, with rather faint metal- 

 lic iridescence; legs (except bases of coxae) usually entirely yellow or 

 white, femora occasionally darkened on basal half. 



Female. — Length, 0.75-2.0 mm. Antennae inserted slightly dorsad 

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

 level of anterior ocellus or slightly higher ; first funicle segment from 

 one and two-fifths to one and one-half times as long as second segment, 

 segments two and three equal in length, club slightly shorter than sec- 

 ond and third funicle segments combined (fig. 16, d) ; length of malar 



