NORTH AMERICAN TETRASTICHUS — BURKS 587 



of tarsi light yellow or white ; anterior tibiae may be almost entirely 

 yellow. 



Female. — Length, 1.5-1.9 mm. Antennae inserted slightly dorsad 

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

 level of anterior ocellus; length of malar space one-half height of 

 compound eye; postocellar line one and one-half times as long as 

 ocellocular; mesopraescutum with one row of bristles at each lateral 

 margin ; submarginal vein of f orewing with four or five dorsal bris- 

 tles ; apex of hindwing blunt, fringe at posterior margin one-third as 

 wide as wing at hamuli. Surface of propodeum smooth, paraspiracu- 

 lar carinae absent ; spiracles touching anterior margin of propodeum ; 

 median length of propodeum one-fourth as long as mesoscutellum ; 

 gaster one and one-half times as long as thorax. 



Male. — Length, approximately 1.5 mm. Small, darkened anterior 

 carina located near apex of scape ; f unicle segments bearing conspicu- 

 ously long bristles on enlargements near bases ; gaster as long as thorax. 



Type locality. — Ithaca, N. Y. 



Type.— U.S.N.M. No. 18382. 



Host. — This species originally was thought to be parasitic on Tetra- 

 stichus {Geniocerus) juniperi, or a species of Eurytoma, but it more 

 likely is parasitic on some midge larvae or the larvae of Anthon-omus 

 juniperinus Sanborn, which develop in juniper berries. 



Distribution. — Nevada, New York. 



TETRASTICHUS RAPO (Walker) 



Figuke 21, e 



Cirrospilus rapo Waxkeb, Ann. Mag. Nat. Hist., vol. 3, p. 415, 1839. 



Geniocerus rapo (Walker) Kubdjumov, Russ. Ent. Obozr. (Rev. Russe Ent.), 

 vol. 13, p. 250, 1913 (this paper lists European synonymy). 



Tetrastichus rapo (Walker) Walkeb, List of the specimens of hymenopterous 

 insects in the collection of the British Museum, Chalcidoidea, vol. 1, p. 76, 

 1846.— Masi, Bol. Portlci Scuola Super. Agr., Lab. Zool. Gen. e Agr., vol. 3, 

 p. 133, 1908.— Silvestbi, Bol. Portici Scuola Super. Agr., Lab. Zool. Gen. e 

 Agr., vol. 4, p. 281, 1910. — Gautieb, Compt. Rend. Soc. Biol. [Paris], vol. 82, 

 p. 720, 1919; Bull. Soc. Ent France, 1921, p. 143.— Picaed, Bull. Soc. Ent. 

 France, 1921, p. 206 ; Bull. Biol. France et Belg., vol. 56, p. 54, 1922.— Gautieb 

 and Bonnamoub, Rev. Path. Veg. et Ent. Agr. France, vol. 11, p. 246, 1924. — 

 Faure, Compt. Rend. Soc. Biol. [Paris], vol. 93, p. 524, 1925.— Ferriere and 

 Faure, Ann. Epiphyt, vol. 11, p. 221, 1925.— George, Bull. Soc. Hist. Nat. 

 l'Afrique du Nord, vol. 18, p. 55, 1927.— Leonabd, New York (Cornell) Agr. 

 Exp. Stat. Mem. 101, p. 984, 1928.— Moss, Journ. Anim. Ecol., vol. 2, p. 210, 

 1933. — Muggeridge, New Zealand Journ. Agr., vol. 47, p. 135, 1933. 



Tetrastichus microgastri Chittenden, U. S. Bur. Ent. Bull. 54 (n. s.), p. 79, 1905; 

 U. S. Bur. Ent. Circ. 60, p. 5, 1905 ; U. S. Dept. Agr. Farmers' Bull. 766, p. 8, 

 1916. 



Bright, iridescent green; base of abdomen often tan or brown; 

 apices of femora and usually entire middle and hind tibiae white; 



