TRICHOCERA. 233 



to Ula is great, and has suggested the name of this new genus 

 ( Ula, and p^, form) ; still, they are easily distinguished by the 

 position of the subcostal cross-vein, the structure of the ovi- 

 positor, which is more elongated and straight in the present 

 genus than in Ula ; by the glabrous eyes of Ulomorpha, its 

 shorter palpi, etc. At present, only one species is known ; but 

 it seems possible that Limnophila pilicornis Zett. Dipt. Scand. 

 X, p. 3885, No. 61, is an Ulomorpha. 



Description of the species. 



1. U. pilosella 0. S. % and 9. — Pallide fusca, antennis, palpis, et 

 fronte fuscis ; abdomine et halterum capitulo infuscatis ; alis immacu- 

 latis, pallide fusco tinctis. 



Pale brown, antennae, palpi, and front brown ; abdomen and knob of the 

 balteres brownish ; wings immaculate, tinged with brown. Long. corp. 

 0.3—0.35. 



Syn. Limnophila pilosella 0. Sacken, Proc. Ac. Nat. Sc. Phila. 1859, p. 242. 



Rostrum yellowish, palpi brown ; front and vertex infuscated 

 in the middle, grayish on the sides, clothed with black hairs ; 

 antennas brownish. Thorax pale brownish, without any apparent 

 stripes above ; pleurae yellowish ; halteres pale at the base ; the 

 knob infuscated ; feet tawny, tips of the femora faintly infus- 

 cated ; tips of the tarsi brown. Abdomen brown, venter paler ; 

 valves of the ovipositor long, slender, pointed, nearly straight. 

 Wings tinged with brownish ; stigma colorless. 



Bab. Trenton Palls, N. Y. ; Sharon Springs, K Y. 



Gen. XXX. TRICHOCERA. 



Two submarginal cells ; five posterior cells ; a discal cell ; the subcostal 

 cross-vein at a considerable distance from the tip of the auxiliary vein 

 (about equal to the breadth of the wing), although posterior to the origin 

 of the second vein ; seventh longitudinal vein very short, strongly arcuated, 

 abruptly incurved toivards the anal angle (Tab. II, fig. 13). Tibiae with spurs 

 at the tip; empodia distinct. Eyes pubescent; distinct ocelli on the sides 

 of the frontal tubercle ; antennae setaceous, 16-jointed, but joints very in- 

 distinct. Male forceps with elongated, fleshy, digitiform appendages ; 

 ovipositor of the female reversed, that is, with the convex side above and 

 the concave below. 



Rostrum and proboscis short ; palpi somewhat prolonged, the 

 last joint elongated, attenuated in the middle, and thus showing 



