ART. 19 AMERICAN MUSCOID FLIES ALDRICH 7 



one lateral pair ; third with a marginal row of about 18 on the entire 

 tergite, extending to the center underneath. The last segment with 

 similar row, about 12; no discal bristles. 



Legs black. 



Wing rather dark brown on basal third or more and along the 

 costa, the larger cells behind considerably lighter in the middle: 

 fourth vein with rectangular bend, not at all rounded, thence rather 

 evenly concave to the costa, considerably before the tip of the wing; 

 third vein with four or five hairs at base. 



Length, 12 mm. 



Not represented in the United States National Museum. 



Genus TELOTHYRIA Van der Wulp 



Telothi/ria Van DEat Wulp, Biologia, Dipt., vol. 2, 1890, p. 167. — BBAUtai and 

 Bergenstamm, Zweifl. Kais. Mus.. pt. 5, 1891, p. 377 ; pt. 6, 1893. p. 132.— 

 TowNSEND, Rev. Mils. Paul., vol. 15, 1926, p. 210. 



Thercvops Brauer aiul Bergenstamm. Zweifl. KaLs. Mus., i)t. 5, 1891, p. 378; 

 pt. 6, 1893, p. 132.— TowNSEND, Rev. Mus. Paul,., vol. 15, 1926, p. 211. 



Originally included in Telothyria were 38 species, a very hetero- 

 geneous group; Brauer and Bergenstamm designated cupreiventris 

 Van der Wulp as type in 1893. In the same place they designated 

 Miltogrammu hrevipennis Schiner as the type of Therevop.s, which 

 originally included this and cuprelventris. No characters for the 

 separation of the two genera were given. A male of cupreiventris 

 is in the National Museum from Porto Bello, Panama (Busck), 

 determined b}^ Townsend. This is clearly congeneric with hrevi- 

 pennis Schiner. noted below. In Townsend's key (1926 above), the 

 pnly difference given is that the posterior crossvein joins the fourth 

 vein somewhat nearer the bend in Telothyria. The opposite is tlie 

 case, as I find in the specimens that in hrevipennis it joins the 

 fourth vein at two-thirds, in cuprelventris at three-fifths, of the dis- 

 tance from the small crossvein to the bend. The principal difference 

 between the two species is that in hrevipennis the mesonotum is cov- 

 ered with the characteristic pale branched hairs, while in cuprei- 

 ventris these are restricted to the pleurae, the dorsum having black 

 hair and a rather dense glaucous [)ruinosity. 



116. TELOTHYRLA. HREVIPENNIS Schiner 



Miltogramnm hrevipennis Schiner, Novara Reise, 1868, p. 324. 

 Thercvops hrevipennis Brauer and Bergenstamm. Zweifl. Kais. Mus., pt. 5, 

 1891, p. 378 ; pt. 6, 1893. p. 132. 



Schiner described hrevipennis from a single male, which has been 

 received for study. The label is " Novara R. Brasilia," and it is 

 also labeled as type of hrevipennis. It agrees with Schiner's descrip- 

 tion, but the third antennal joint is a little longer than his estimate. 



