THE CANADIAN ENTOMOLOGIST. 14P 



Wings densely ciliated; the stigma lanceolate and rather broad, 

 much broader than the first abscissa of radius is long; radius arising 

 much before the middle and attaining the wing margin far above 

 the extreme v/ing apex; its first abscissa very short; second discoidal 

 cell open below at the apex. Abdomen ovate, about as long as the 

 thorax; its first dorsal segment smooth and polished, or nearly so; 

 following segments also smooth; second segment more than twice 

 as wide at apex as at base; following segments tapering to the apex; 

 ovipositor slightly exserted. General color black; mandibles 

 brownish, tips black; palpi fuscous; scape dark brown, flagellum 

 brown-black; tegula? black; wing veins and stigma brownish; legs 

 including coxa?, dark brown; the anterior pair slightly paler; first 

 and second abdominal segments brownish ; following segments 

 black; ovipositor sheath black. 



Male. — Essentially as in female. 



Type locality. — Lakeland, Florida. 



Host. — Agromyza piisilla. 



Type No. 15594, United States National Museum. The type 

 series consists of three females and three males from the type 

 locality, labelled W^ebster, No. 9489.— G. G. Ainslie, collector. 



The species is distinguished from 0. aridus by the total absence 

 of the mesopleural furrow, and the open second discoidal cell as well 

 as by the dark brown legs and fuscous palpi. 



Opiiis siiccineus, n. sp. 



Female. — Length, 2 mm. Head transverse, smooth and 

 polished, sparsely hairy; the face moderately hairy, impunctate, 

 with a rather more distinct median ridge than usual; clypeus 

 arcuate, leaving a transverse, elliptical opening between it and 

 the mandibles; antennae longer than the body, pubescent, 29- 

 jointed in the type. Propleurae smooth ; mesonotum with a median 

 dimple-like impression before the scutellar fovea, the parapsidal 

 furrows distinctly impressed anteriorly for nearly one-third the 

 length of the mesonotum and faintl}^ traceable as shallow impressed 

 lines to the median dimple; mesopleura? smooth, but with a strongly- 

 oblique toveolate furrow below the middle; propodeum indefinitely 

 sculptured faintly rugulose, with a sinuous, transverse raised line 

 or carina near the middle. Wings hyaline, the stigma lanceolate; 



