26 NORTH AMERICAN DIPTERA. 



C. ORPHNEPHILIM1. 



Small, obscurely reddish yellow, bare flies of peculiar appear- 

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

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

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

 antennae situated near the oral margin, apparently 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, somewhat impressed 

 before the scutellum. Scutellum rather large, obtusely three 

 cornered ; metanotum arched. Abdomen narrower than the 

 thorax, cylindrical, composed of seven segments ; male geni-- 

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

 with broad, rounded lamellae. Legs simple, comparatively 

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

 erately long; the front pair 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 arid 

 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, Orphne- 

 phila Haliday. The small fly is found on the banks of streams. 



7. PSYCHODIDJS. 



Very thickly haired, minute flies, in appearance lepidoptera- 

 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 (Phlebotomus) elongated and horny ; palpi incurved 



