2G NOETII AMERICAN IHITKRA. 



G. OPvPHNEPHILlD.E. 



Small, obscurely reddish yellow, bare flies of peculiar a})j)ear- 

 ance. Head small, round; eyes round, contiguous in front ; 

 ocelli wanting; proboscis short; palpi longer than the antennae, 

 live-jointed, the first joint short, the second the thickest ; 

 antenuK situated near the oral margin, apparentl}^ consisting 

 of a small first joint, an oval second joint and a terminal 

 arista ; the second joint and the arista are, however, complex, 

 the first composed of three and the latter of seven segments, 

 the last of which terminates in a bristle. Thorax strongly 

 convex, robust, without transverse suture, son:iewhat impressed 

 before the scutellum. Scutellum rather large, obtusely three 

 cornered; metanotum arched. Abdomen narrower than the 

 thorax, cylindrical, comi)Osed of seven segments ; male geni- 

 talia thick, the basal piece swollen, bladder-like ; ovipositor 

 with broad, rounded lamellge. Legs simple, comparatively 

 short; coxse not elongated; tibiae without spurs; tarsi mod- 

 erately long; the front i)air longer than the tibiae, the penul- 

 timate joint short; claws small; pulvilli distinct. Wings 

 longer than the abdomen ; auxiliary vein short, terminating 

 in the costa; second longitudinal vein sinuous; third and 

 fourth veins not furcate ; anal angle rounded; basal cells short. 



But two or three species of this singular family are known, 

 and of them even, so far as I can learn, the larval habits are 

 yet unknown. The species all belong to one genus, Orjihne- 

 p]iil(( llaliday. Tlie small fly is found on the banks of streams. 



7. rSYCHODID^. 



Very thickly haired, minute flies, in appearance lepido})tera- 

 like. Head small ; ocelli wanting. Antennae as long as the 

 head and thorax together, bead-like; thickly haired, composed 

 of from twelve to sixteen joints; the two basal joints thicker 

 and short-cylindric. Proboscis usually short; in some exotic 

 genera (T'/i/chofiD/n/s) idongated and lioniy : ])alpi incurved 



