206 DIPTERA OF NORTH AMERICA. [PART IV. 



. on the cross-veins ; second submarginal and first posterior cells nearly 

 of the same length. Long. corp. 0.35. 



Head yellowish-gray above ; rostrum and palpi brown ; antennas 

 brown, basal joints reddish ; those of the female (the only sex I 

 have before me) are longer than the head and the thorax taken 

 together ; the first joint is very short, not longer than the second ; 

 the joints of the flagellum are elongated, subcylindrical, with 

 moderately long verticils in the middle. Thorax yellowish-gray, 

 this color being produced, on the mesonotum, by a dense gray 

 bloom, apparently upon a darker ground ; pleurae somewhat 

 hoary .; halteres yellowish, with a faintly brownish knob. Abdo- 

 men brown, with short scattered yellowish hairs ; ovipositor 

 rather short, moderately arcuated ; coxae and femora tawny, tibiae 

 and tarsi brown. Wings with a brownish tinge ; stigvma dark 

 brown ; a pale brown cloud at the origin of the praefurca ; another 

 one on the central cross-veins ; smaller clouds on the great cross- 

 vein, and the cross-veins at the inner end of the third and fourth 

 posterior cells. Tip of the auxiliary vein nearly opposite the 

 inner end of the second submarginal cell ; the petiole of the first 

 submarginal cell is but little shorter than the upper branch of the 

 second longitudinal vein ; the marginal cross-vein is at the tip 

 of the first longitudinal vein, a short distance beyond the inner 

 end of the first submarginal cell ; the second submarginal cell is 

 only slightly longer than the first posterior ; the great cross-vein 

 is opposite the middle of the discal cell ; the latter is elongated. 



Hab. White Mountains, N. H. ; a single female. 



The structure of the antennae of the female renders it very 

 probable that the male has much longer antennae, and it is on 

 this supposition that this species is placed among those with 

 elongated male antennas. 



3. Ii. fasciolaf a n. sp. % . — Ferrugineo-flava, thorace cinerascente, 

 antennis maris thorace multo longioribus, articulis elongatis, pubes- 

 centibus ; alis fusco-fasciatis et maculatis ; praefiircae basi appendicu- 

 lar ; venula transversa supernumeraria in cellula basal i secunda. 



Ferruginous-yellow, thorax grayish ; antennas of the male much longer 

 than the thorax ; joints elongated, pubescent ; wings banded and spotted 

 with brown ; a stump of a vein at the origin of the praefurca ; a super- 

 numerary cross-vein in the second basal cell. 



Syn. Limnophila fasciata 0. Sacken (non Scuum.), Proc. Ac. Nat. Sc. Phil. 

 1859, p. 234. 



