LIMNOPHILA. 213 



ovipositor, etc., prove the relationship of these species, the differ- 

 ence in the length of the male antennae notwithstanding. The 

 size of this species is somewhat variable. In some specimens 

 the prsefurca has a stump of a vein near its origin. 



9. L.. imbecilla 0. S. % and 9- — Pallide ochracea, fuscescens, 

 opaca, fronte cinerascente ; antennis utriusque sexus longitudine medi- 

 ocri, verticillis longis ; alis pallide fusco-flavescentibus, stigmate con- 

 colori ; petiolo cellulse submarginalis prinise longo ; cellulis submarginali 

 secunda et posteriori prima seque longis. 



Pale brownish-ocliraceous, opaque, front grayish ; antennae of both sexes of 

 moderate length, with long verticils ; wings with a pale yellowish-brown 

 tinge ; stigma concolorous ; the petiole of the first submarginal cell is 

 long ; the second submarginal and first posterior cells are of the same 

 length. Long. corp. 0.33—0.38. 



Syn. Limnophila imbecilla 0. Sacken, Proc. Ac. Nat. Sc. Phil. 1859, p. 237. 



This species is remarkably like the preceding in all the im- 

 portant characters ; it is slightly smaller, and the wings are 

 narrower ; besides these, the only striking differences consist in 

 the coloring. The body is entirely opaque ; the front is gray ; 

 the thorax pale yellowish, of a more saturate color above ; pleurae 

 and metathorax slightly hoary ; the first joint of the antennse is 

 brownish, with a gray bloom above, the basis of the flagellum 

 paler ; the wings have a slight yellowish-gray tinge. All the 

 other characters, including the structure of the antenna? and the 

 venation, are like those of L. recondita. 



Hob. Trenton Falls, N. Y. ; Maryland (Cresson). In one 

 specimen the stigma is faintly brownish. The indicated differ- 

 ences, notwithstanding, it is not impossible that this species is 

 only a variety of the preceding. 



10. L.. toxoneura 0. S. % and 9 • — Pallide ochracea, fuscescens ; 

 antennis utriusque sexus longitudine mediocri, fuscis ; alis subhyalinis, 

 stigmate pallide infuscato ; petiolo cellulse submarginalis prinise longo, 

 conspicue arcuato ; cellulis submarginali secunda et posteriori prima 

 subseque longis. 



Pale ochraceous, brownish ; antennse in both sexes of moderate length, 

 brown ; wings subhyaline stigma pale brownish ; petiole of the first 

 submarginal cell long, conspicuously arcuated ; second submarginal and 

 first posterior cells almost of the same length. Long. corp. 0.3 — 0.35. 



Syn. Limnophila toxoneura 0. Sacken, Proc. Ac. Nat. Sc. Phil. 1859, p. 236. 



