580 PROCEEDINGS OF THE NATIONAl, MUSEUM vol. 93 



spiracular carinae present and a series of short carinae radiating latero- 

 anteriorad from posterior margin (fig. 21, c) ; mesal length of pro- 

 podeum one-fifth greater than that of postscutellum and slightly more 

 than one-third as great as length of mesoscutellum ; propodeal spira- 

 cles, separated from anterior margin by a space one-half as great as 

 length of a spiracle; rudimentary petiole narrow, obscure; dorsal sur- 

 face of gaster very obscurely reticulated, almost smooth, longer than 

 thorax. 



Male. — Length, 1.5-1.9 mm. Antennal scape broadened only near 

 apex, flagellar segments without conspicuously long setae, shaped as 

 in female ; pedicel and each f unicle segment of the same length, club 

 slightly more than twice as long as fourth f unicle segment; gaster 

 slightly longer than thorax and propodeum. 



Type locality. — Urbana, 111. 



Types. — Holotype, allotype, 9 male and 16 female paratypes in Illi- 

 nois Natural History Survey collection ; 6 female and 3 male paratypes, 

 U.S.N.M. No. 56254. 



Described from 23 female and 13 male specimens : Female holotype, 

 male allotype, and 22 female and 12 male paratypes reared from wild 

 lettuce galls of Aulacidea podagrae (Bassett), January 26, 1891, C. A. 

 Hart. An additional 20 female and 7 male specimens of this species, 

 not included in the type series, are in the National Museum collection ; 

 these appear to have been reared from a stem gall on blueberry made 

 by Hemadas nubilipennis Ashmead, March 8, 1872, but these data may 

 not be correct ; no locality record is available for these specimens. 



TETRASTICHUS MINUTUS (Howard) 



Astichus minutus Howard, in Coinstock, U. S. Dept. Agr., Rep. Ent., 1SS1, p. 369. — 

 Cbesson, Synopsis of families and genera of Hymenoptera . . ., p. 245, 

 1887.— Viebeck, Connecticut State Geol. and Nat. Hist. Survey Bull. 22, p. 457, 

 1916. 



Epomphaloides minutus (Howard) Glrault, Societas Entomologica, vol. 31, p. 35, 

 1916. 



Tetrastichus lecanii Ashmead, Trans. Amer. Ent. Soc, vol. 12, p. xix, 1885. — 

 Cbesson, Synopsis of families and genera of Hymenoptera .... p. 246, 1S87. 

 (New synonymy.) 



Ccranisus lecanii (Ashmead) Ashmead, Trans. Amer. Ent. Soc, vol. 14, p. 202, 

 1887. 



Tetrastichus olepyri Ashmead, Can. Ent., vol. 32, p. 304, 1902. — Armitage, Journ. 

 Econ. Ent., vol. 16, p. 511, 1923.— Gahan, Proc. U. S. Nat. Mus., vol. 65, art. 4, 

 p. 19, 1924. — Timberlake and Clausen, Univ. California Publ. Ent., vol. 3, 

 p. 248, 1924.— Miller and Thompson, Florida Ent., vol. 11, p. 3, 1927.— 

 Smith and Compere, Univ. California Publ. Ent., vol. 4, p. 306, 1928.— Miixeb, 

 Florida Agr. Exp. Stat. Bull. 203, p. 456, 1929. (New synonymy.) 



Tetrastichus (Tetrastichodes) detrimentosus Gahan, Proc. U. S. Nat. Mus., vol. 46, 

 p. 439, 1913 ; vol. 65, art. 4, p. 19, 1924. 



Tetrastichodes detrimentosus Gahan, Girault, Societas Entomologica, vol. 31, 

 p. 35, 1916. 



