110 DIPTERA OF NORTH AMERICA. 



remainder of the wings is unspotted. The posterior transverse 

 vein is oblique and moderately curved. 



Hah. Trenton Falls, N. Y. (Osten-Sacken.) 



2. T. valida Loew. 9 • — Seta antennarum nigro-plnmosa ; vittse fron- 

 tales tres laevigata ; alae parce et grosse reticulate, vena transversa poste- 

 riore perpeudiculari. 



Bristle of the antennae plumose with black, front with three shining stripes, 

 reticulation of the wings sparse and coarse ; posterior transverse vein 

 almost perpendicular. Long. corp. 0.29. Long. al. 0.29. 



Pale yellow. Face yellowish-white, only moderately receding ; 

 palpi and proboscis whitish-yellow. Front orange-yellow, with 

 three very bright longitudinal stripes; the middle stripe not dis- 

 tinctly widened towards its anterior end, the lateral ones reaching 

 a little beyond the foremost frontal bristle, which is inserted rather 

 lower than in the preceding species, so that the lateral stripes 

 reach a little nearer to the anterior border of the front. Antennae 

 ochreous, having the two first joints short, with black hairs ; the 

 third a little longer than the two first taken together, moderately 

 broad and only a little pointed ; the bristle of the antennas with 

 dense, very long, black hairs. There are no black spots on the 

 lateral border of the front, nor on the yellow occiput. Thorax 

 yellowish, with indistinct brownish longitudinal stripes. Pleura? 

 whitish-yellow, with a narrow brown longitudinal stripe on their 

 superior border. Abdomen without distinct markings. Legs 

 whitish-yellow, with the tips of the tarsi a little blackish ; poste- 

 rior femora with short, not very dense hairs on the under side and 

 only two longer bristles on the second third. Wings proportion- 

 ately a little smaller than in the foregoing species, somewhat tinged 

 with tawny. The stigma, smaller than in the foregoing species, is 

 brownish-black ; the transverse veins and the tip of the wings are 

 clouded with brownish-black ; before the second longitudinal vein 

 there are six or eight small but distinct brownish-black spots; be- 

 tween the second and third longitudinal veins there are four or five 

 darker ones running from vein to vein, the last of which are more dis- 

 tinct; between the third and fourth longitudinal veins there are, be- 

 hind the small transverse vein, four or five brownish-black transverse 

 streaks ; at the posterior side of the fourth longitudinal vein there 

 are two rather large brownish-black spots, one before, the other, 

 larger one behind the posterior transverse vein ; on the anterior 



