g2 I'h'OCEEDlNOS OF THE NATIONAL MUSEUM. vol. 4ii. 



rery narrow transverse opening, if at all; mandible with a distinct 

 tooth or notch on the ventral margin near the base; antennae 29- 

 jointed in the type, inserted a little above the middle of the eyes, the 

 first flagellar joint two and one-half times as long as thick; oceU- 

 ocular line about 2^ times as long as the diameter of an ocellus; 

 width of the posterior orbit about half that of the eye; mesoscutum 

 with the parapsidal grooves impressed anteriorly for a short distance 

 only; mesopleural impression deep and slightly crenulate; propodeum 

 rugose. Stigma of the forewing narrow, lanceolate, with the radius 

 arising distinctly before its middle; fii-st abscissa of radius equal to 

 about half the width of stigma; second abscissa more than one and 

 one-half times the length of the first transverse cubitus. Abdomen 

 ovate, its first tergite about as long as broad at apex and fully twice 

 as broad at apex as at base; irregularly striate; following tergites 

 smooth; ovipositor hardly exserted. Head, thorax, and first abdom- 

 inal tergite black; antennal flagellum black; scape, pedicel, clypeus, 

 mandibles, palpi, legs including coxae, and the tegulae pale stramin- 

 eous; second tergite concolorous with the legs, the following tergites 

 blackish or brownish; wings hyaline, the nervures and stigma dark 

 brown; apical one-third of the hind tibiae and their tarsi as well as 

 the apices of the middle and anterior tarsi brown. 



Male. — Differs from the female only in the usual sexual characters. 



Type-locality. — Washington, District of Columba. 



Type.— C&t. No. 19365, U.S.N.M. 



Nine specimens labeled "Ex. Agromyzid in leaves of Chrysanthe- 

 mum, Sept. 7, 1913, Mary Faunce collector." 



OProS UTAHENSIS Gahan. 



Opius utaJiensis Gahan, Can. Ent., vol. 45, 1913, p. 145; .Toiirn. Agri. Research, 

 U. S. Dept. of Agr., vol. 2, 1913, p. 29, pi. 5, fig. 2. 



Habitat. — Utah. 



Host. — Agromyza parvicomis. 



OProS AMPLUS Ashmead. 



Adelura ampla Ashmead, Bull. Colo. Biol. Assoc, vol. ]. 1890. p. 19. 



Habitat. — Colorado. 

 Host. — Unknown. 



OPIUS BASINIGER Vlereck. 



Opms hasiniger Viereck, Trans. Ivans. Acad. Sci., vol. 19, 1905, p. 270. 



The type of this species is in the Snow collection and has not been 

 examined. 



Hahitat. — Kansas. 

 Host. — Unknown. 



