1911] GirauJt, Species of Trichogrammatilw (Hymenoptera). 139 



Trichogramma pretiosa Riley — Swezey, 1907, pp. 26, 37, 46-47, 54, 



55 and 56. 

 Trichogramma pretiosa Riley — Taylor, 1907, p. 4. 

 Trichogramma pretiosa Riley — Koebele, 190S, p. 91. 

 ^Trichogramma pretiosa Riley — Quaintance, 1908, p. 443. 

 ^Trichogramma pretiosa Riley — Severin and Severin, 19> S, pp. 



68-70, pi. V, fig. 5. 

 *OopMhora pretiosa (Riley) — Masi (1909). 

 Pentarthron minutum (Riley) — Idem, ib. 

 Trichogramma sp. — Sanderson, 1909. 

 Trichogramma pretiosa Riley — Silvestri, 1909. 

 Clia'tostriclia pretiosa (Riley) — Sehmiedekneeht, 1909, p. 486. 

 Pentarthron minutiim (Riley) — Sehmiedekneeht, 1909, p. 4S7. 

 ^Pentarthron minutum (Riley) — Girault, 1911. 

 *Cha'tostric1ia nana Zehntner (partim) — idem, ibid. 

 ^Trichogramma sp. I — Howard and Fiske, 1911, p. S7. 

 ^Trichogramma pretiosa Riley — idem, pp. 143, 257 ff. 

 ^Trichogramma pretiosa-Wke — idem, pp. 136, 257 ff. 



This is the commonest and best known species of the whole 

 family, yet great confusion exists in the literature concerning" it 

 and it has been described, redescribed and figured a number of 

 times quite erroneously. It still remains unrecognizable from the 

 literature but we shall make here some attempt at its more easy 

 and certain identification. 



Originally it was described by Riley (1871) in this manner: 



"The Disippus Egg-parasite. — The eggs already de- 

 scribed were very abundant last fall on a certain clump 

 of willows near Kirkwood, and of about two hundred ob- 

 tained, fully one-half of them were parasitised. Instead 

 of hatching out into larvae, as they would have done if 

 they had been unmolested, these last produced little dark 

 colored four-winged flies, from four to six of which would 

 gnaw their way through the shell of each egg. This little 

 fly belongs to the great Chalcis family, and though 

 scarcely more than 0.02 inch long, it can jump to the dis- 

 tance of several inches. Its wings, especially the hind 

 ones, are beautifully fringed with hairs. It is ineonspicu- 



