86 I'llOCEBDIiyaS of tub XATIONAL ].!U8EUM. vol.49. 



OPIUS ABERRANS Vlereck. 

 Opius aberrans Viereck, Trans. Kans. Acad. Sci., vol. 19, 1905, p. 271. 



The type of this species has not been examined. A specimen from 

 Onaga, Kansas, which agrees with the description is in the United 

 States National Museum and the characters used in the table of 

 species are taken from this specimen. 



Hahitat. — Kansas. 



Host. — Unknown. 



OPIUS UNIFASCIATUS Ashmead. 

 Opius unifasciatus Ashmead, Joimi. Linn. Soc. Zool., vol. 25, 1894, p. 135. 

 Hahitat. — St. Vincent. 

 Host. — Unknown. 



OPIUS MONTANUS Ashmead. 

 Adelura montana Ashmead, Bull. Colo. Biol. Assoc, a^oI. 1, 1890, p. 19. 



This species apparently differs from dimidiatus only in the follow- 

 ing details: The propodeum is smooth and the first tergite is not 

 granularly rugose but practically smooth; the legs and the first and 

 second tergites are dark reddish instead of pale straw-colored; the 

 second abscissa of radius is more than twice as long as the first 

 transverse cubitus while in dimidiata it is distinctly less than twice 

 as long. Notes from the type. 



Hahitat. — Colorado. 



Host. — Unknown . 



OPIUS DIMIDIATUS Ashmead. 



Plate 35, fig. 11. 



Adelura dimidiata Ashmead, Proc. U. S. Nat. Mus., vol. 11, 1888, p. 647. 

 Eutrichopsis agromyzae Viereck, Proc. U. S. Nat. Mus., vol. 42, 1912, p. 622. 

 Opius (Eutrichopsis) agromyzae (Viereck) Gahan, Can. Ent., vol. 45, 1913, p. 148. 



Ashmead's type is identical in every respect with those of Viereck. 

 The species is a common parasite of Agromyza jMsilla, and it is alto- 

 gether likely that the "Dipterous larva in a stem of cabbage" given 

 by Ashmead as the host was this Agromyzid, as this fly has been reared 

 from cabbage leaves by the writer at College Park, Maryland. The 

 species can only be separated from aridus and hruneipes by the 

 characters used in the key. 



Hahitat. — Maryland, Ohio, Indiana, South Dakota. Utah. 



OPIUS TANTILLUS Ashmead. 

 Opius tantillv^ Ashmead, Trans. Ent. Soc. Lond.. 1900. p. 294. 



Habitat. — Grenada. 

 Host. — Unknown. 



OPIUS INTERSTITIALIS Ashmead. 

 Opius interstitialis Ahkwe AD. Joum. Linn. Soc. Lond. Zool.. vol. 25. 1894, p. 136. 



Hahitat. — St. Vincent. 

 Host. — Unknown . 



