148 THE CANADIAN ENTOMOLOGIST 



width of Stigma; second discoidal cell closed. Abdomen not longer 

 than the head and thorax; the first dorsal segment longer than wide 

 at apex, smooth and polished like the following segments: o^•i- 

 positor sheath extending slightly beyond the tip of the abdomen. 

 General colour, black; clypeus, mandibles and palpi stramineous; 

 tips of mandibles brown; legs in the type stramineous, the apices 

 of posterior tibiae, their tarsi and the median tarsi fuscous (in other 

 specimens of the type series the legs vary from pale stramineous 

 to wholly dark brown) ; tegulse and wing base brownish testaceous; 

 2nd segment of the abdomen more or less stramineous, first segment 

 and those beyond the second piceous to black; ovipositor sheath 

 black. 



Maleessentially like the female, but with the antennse 20- 23- 

 jointed. 



Type locality. — Tempe, Arizona. 



Host. — Agromyza pusilla. 



Type No. 15593, United States National Museum. The type 

 series contains 10 females and 10 males, labelled Webster, No. 

 7215. — V. L. Wildermuth, collector. 



This species in general appearance closely resembles Opiiis 

 {EiUrichopsis) agromyzae Vier., which is parasitic on the same host. 

 It may be distinguished from that species, however, by the non- 

 foveolated impression on the mesopleurae and the smooth first 

 abdominal segment. * 



Opiiis bruneipes, n. sp. 



Female. — Length, 1.25 mm Head perfectly smooth and 

 highly polished; face sparse'y hairy; vertex, temples and occiput 

 with a few scattering and inconspicuous hairs; clypeus arcuated 

 on the anterior margin, leaving a transverse, elliptical opening 

 between it and the mandibles; antennae longer than the body, 

 pubescent 21-jointed in the type, the first joint of flagellum slightly 

 longer than the second. Thorax smooth and highly polished, 

 robust, without a median dimple-like depression on the mesonotum, 

 parapsidal furrows wholly effaced or represented by only a few in- 

 distinct punctures at anterior lateral angles; mesopleurae without 

 a trace of an impressed furrow above the coxae; propodeum entirely 

 smooth and polished, wfth very few hairs; metapleurse also smooth. 



