202 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 53. 



Antennae slender, longer than the body, 29-jointed in the type; 

 head, viewed from above, about twice as broad as long, the posterior 

 orbits about equal to the transverse diameter of the eye and only 

 slightly receding; eyes oval; broad opening between clypeus and 

 mandibles; the ventral margin of mandibles without a notch; malar 

 space a little less than the width of a mandible at base; parapsidal 

 grooves effaced behind the middle of the mesoscutum which is with- 

 out a median impression posteriorly; scutellum flat, sculptured like 

 the mesoscutum, the transverse suture between it and the mesoscutum 

 crenulate; mesopleura with a longitudinal impression below the 

 middle which is not crenulate ; propodeum finely rugulose and opaque 

 all over, without carinae; stigma of forewing lanceolate, emitting 

 the radius much before the middle; recurrent nervure interstitial; 

 second abscissa of radius nearly twice the first transverse cubitus; 

 the radial cell terminates slightly before the extreme wing-apex; 

 first abdominal tergite sculptured like the propodeum, bicarinate 

 at base, the carinae uniting about the middle of the tergite and ex- 

 tending as a median carina nearly to the apex ; second and following 

 tergites with sculpture similar to that of the mesoscutum but 

 finer; abdomen ovate, about equal in length to the thorax, the ovi- 

 positor exserted about the length of the sixth tergite. Black ; scape 

 and pedicel beneath, clypeus, mandibles except at apex, tegulae, all 

 legs, including coxae, the coalesced second and third tergites and to 

 some extent the fourth tergite testaceous; posterior tibiae slightly 

 tinged with fuscous ; wings hyaline, the veins and stigma brown. 



Male. — Similar to the female in every way except that the anten- 

 nae are 28- jointed in the type, and the third and fourth abdominal 

 tergites have a brownish apical band, while the tergites beyond the 

 fourth are not black but dark brownish. 



Type-locality. — Greenwood, Mississippi. 



Type.— C&t. No. 20379, U.S.N.M. 



Host. — Ceradontha dorsalis. Reared from pupal stage of host. 



A male and female reared by H. E. Smith and recorded in the 

 Bureau of Entomology under Webster No. 12814, Cage. No. B-90. 



OPIUS OTIOSUS, new species. 



Female. — Length 2.5 mm. In the writer's key to the species of 

 Opius ^ this runs straight to unifasciatus Ashmead and is extremely 

 like the type of that species, but differs in having the first tergite 

 more distinctly sculptured and only the extreme apical segments of 

 the abdomen blackish, instead of most of the abdomen being black 

 as in unifasciatus. 



Head strongly transverse, smooth and polished; face broad, with 

 a slight but distinct impression each side of the middle extending 



1 Proc. U. S. Nat. Mus., vol. 49, 1915, p. 6& 



