LIMNOPHILA. 209 



delicate, dense pubescence ; a few verticillate delicate hairs about 

 the middle of each joint ; antennae of the female shorter than 

 those of the male ; bent backwards, they would reach the end of 

 the thorax; the flagelluni is clothed with scattered hairs, and 

 shows no vestige of a pubescence, except on the underside of the 

 joints near the basis. Ground-color of the thorax brownish-black, 

 clothed with a grajish bloom ; the space usually occupied by the 

 stripes has less of this bloom, and is therefore darker, somewhat 

 shining, clothed with a short, delicate, erect, yellowish-gray 

 pubescence ; the stripes are not well defined, although their 

 general outline is marked by the more dense gray bloom sur- 

 rounding them. Halteres pale, knob brownish. Coxaa yellow, 

 the front ones brownish at the extreme basis ; feet brown, femora 

 yellowish towards the basis. Abdomen blackish -brown ; venter 

 yellowish, except at the tip, where it is brown ; forceps brownish- 

 black ; ovipositor elongated, slender, gently curved. Wings with 

 a slight pale brownish tinge ; stigma colorless ; tip of the aux- 

 iliary vein a little before the inner end of the second submarginal 

 cell ; prasfurca arcuated near the origin, otherwise quite straight ; 

 petiole of the first submarginal vein short ; the marginal cross- 

 vein is about the middle of the distance between the tip of the 

 first longitudinal vein and the inner end of the first submarginal 

 cell ; the inner ends of the second submarginal and first posterior 

 cells are nearly in one line ; the inner end of the discal cell is 

 slightly anterior to them ; the great cross-vein is nearly opposite 

 the middle of the discal cell ; petiole of the second posterior cell 

 usually shorter than the cell itself; fifth longitudinal vein arcuated 

 at the tip ; the apex of the wing is finely pubescent. 



Hab. White Mountains, X. H., in July. Three male and one 

 female specimen. 



6. L.. niveitarsis, n. sp. % and J. — Thorace nigro, cinereo-pol- 

 linoso ; antennis nigris, in mare thorace inulto longioribus, articulis 

 elongatis, pubescentibus ; in femina thorace brevioribus ; abdomen fus- 

 cescens, forceps in mare flavus ; tarsi postici albi ; alse inimaculatse ; 

 stigmate pallide fuscescente. 



Thorax black, with a gray pollen ; antenna? black, much longer than the 

 thorax in the male ; shorter than the thorax in the female ; abdomen 

 brownish ; forceps of the male yellow ; hind tarsi white ; wings immacu- 

 late ; stigma with a pale brownish tinge. Long. corp. 0.25. 

 14 Sept., 1868. 



