120 DIPTERA OF NORTH AMERICA. 



The head above is golden yellow with two small rusty stripes on its fore 

 part, a black spot at base and dot each side anteriorly, almost in contact 

 with the eye, and a second one, also black, on the anterior margin, between 

 the eye and the antenna?. Face silvery white. Antenna? light yellow, 

 second joint longer than broad, with fine short black bristles along its 

 upper and under edge ; third joint tinged with brown, narrow and curved, 

 its upper side being concave, its lower side convex, and nearly parallel 

 with the upper side, but slightly narrowed towards the apex, which is 

 rounded ; seta yellowish white, plumose. Thorax pale dull yellow, with 

 a faint darker stripe each side of the middle, which stripes have an ash 

 gray reflection when viewed from the front ; clothed with a short black 

 beard and a few long black bristles. Scutel ash gray with two nearly 

 erect black bristles each side. Poisers yellowish white. Abdomen dusky, 

 clothed with a short black beard, hind edges of the segments pale dull 

 yellow. Legs pale yellow, with a fine black beard, and the spine-like 

 bristles at the end of the shanks black. Wings iridescent, smoky brown 

 on the outer and apical margins, hyaline towards the axilla, the space 

 between divided into numerous square hyaline spots by dusky longitudi- 

 nal stripes, one stripe being placed in the middle of each cell and sending 

 short transverse branches to the veins at regular intervals ; veins and 

 veinlets black. 



11. T. plebeja Loew. % and 9. — Seta antennarum nigro-plumosa ; 

 ala? non reticulata?, vena transversa posteriore modice arcuata, subper- 

 pendiculari. 



Bristle of the antenna? plumose with black, wings not reticulated, with 

 the posterior transverse vein moderately arcuated and nearly perpendi- 

 cular. Long. corp. 0.28—0.29. Long. al. 3. 



Yery allied and similar to the following species, but certainly 

 different. Acorn-colored. Front yellow; the usual black spot 

 near the orbit totally wanting. The excavated polished middle 

 stripe of the front is not enlarged anteriorly ; the polished lateral 

 stripes are very broad and glossy, yet do not extend far beyond 

 the middle of the front. Antennas dark yellow, the third joint a 

 little longer than the second, rather distinctly excised on its upper 

 side ; antennal bristle black with long and very close black hairs. 

 Face considerably retreating, yellowish with white reflection. Upper 

 side of the thorax, scutellum and pleura; quite as in the following 

 species. Abdomen brownish-yellow without darker middle line 

 nor lateral stripes in the pair I have before me; but in well colored 

 specimens they may exist. Legs as in Tet. plumosa. Wings 

 brownish-yellow margined with blackish-brown on the whole of 

 the costal border, beginning at the base of the stigma and being 



