282 AMERICAN DIPTERA. 



Tetanops luridipennis Lw. 



East Las Vegas, N. M. One 5 • 



Tetaiiops vittifrons v. d. W. 



Guadalajara, Mexico. Two $ . 



Autoiiiola ruTa sp. uov. (PI. VI, fig. 5). 



Yellow to red and black ; all bristles black. 



Frout yellow, darker at vertex, covered witli minute bristles; one pair of 

 frontals and the usual vertical bristles. Face rufous ; antennal fovese rather deep, 

 running to oval margin, median carina wide, light yellow. Cheeks light brown, 

 bare, except towards the oral margin and the occiput. Clypeus rufous. An- 

 tennae rufous, third joint four times as long as the second, roundly pointed ante- 

 riorly ; arista of like color about one-half again as long as third antennal joint, 

 but slightly larger and darker at base. Eyes dark brown. Occiput convexed, 

 bare below, except the oral margin and near the cheeks, light brown below, 

 darker above. Palpi and proboscis rufous. 



Thoracic dorsum dark brown, lightly poUinose, convexed with minute erect 

 bristles; lateral margins and humeii yellow, shining, no acrosticals, two pair 

 dorso-central bristles, the series of bristles on the sternopleura near the middle 

 coxffi very conspicuous; mesopleura and sternopleura dark brown, the remainder 

 of the pleura more rufous; metanotum black. Scutellum flat, reddish, with four 

 bristles. Squamula brownish. Halteres whitish. 



Abdomen distinctly arched, narrowly elongate, the first segment reddish and 

 is covered with minute erect bristles, excepting a bare dorsal median cross baud, 

 and a bare poUinose posterior margin ; the second and third segments blackish, 

 also covered with miuute bristles, but smaller and appressed, no bare median 

 cross band, the posterior margins bare but not poUinose; first, second and third 

 segments have a series of stout, erect, pre-marginal bristles; the fourth segment 

 brown, also covered with appressed minute bristles, and the series of stout erect 

 bristles are marginal. 



Legs reddish, hind coxte lighter; all tarsi yellow, middle tibiae with a series of 

 short stout bristles on the middle of the posterior side; front and hind femora 

 armed; hind coxae with a tooth-like projection near the joint, which is armed 

 with long bristles, and one bristle on the lateral side; all other coxae armed. 



Wings grayish hyaline ; small cross-vein beyond the middle of tlie discal cell ; 

 anal cell obtuse, third and fourth veins parallel. Base of wing iufuscate, other- 

 wise provided with three complete dark brown cross-bands; the first and widest 

 passing through the stigma and base of discal cell to the posterior margin ; the 

 second arising between the ends of the first and second veins, passing thr(jugh 

 the posterior cross-vein to the posterior mai'gin ; the last arising at the end of 

 second vein and dissolving in the second posterior cell; the rudiments of another 

 band between the second and third bands form a broad spot in the submarginal 

 cell and a small spot in the first posterior cell, and is cross connected to the third 

 band in the marginal cell. Length 5V mm. 



Alamogordo, N. Mex. One % . Type in Acad. Nat Sci. Phila. 

 collection. 



