SOUTH AMERICAN DIPTERA. 261 



the wings being brown on the anterior two-thirds, the distal part nearly hyaline, 

 without the apical spot of T. puella. The hind femora are a little stouter than 

 in the last-named species, the tibiae less thickened. 



One specimen, Chapada. 



11. Tricliopsoiuyia lougieornis u. sp. 



9 . — Length 8 mm. Antennae slender, distinctly longer than the face. Facial 

 tubercle large, rounded, deeply concave above and below it. Ocellar tubercle 

 prominent, the front above uneven, but without distinct tubercles or ridges. 

 Across the middle of the mesouotum a less shining, or subopaque band. Abdo- 

 men moderately shining metallic, clothed with fine yellow pubescence ; the hind 

 margin of the second and third segments subopaque black. Hind femora mod- 

 erately thickened, the thickening greatest on distal half. Hind tibiae strongly 

 dilated and thickened, less so than in tnberculnta and puella. more so than in 

 polita. Wings cinereous hyaline, yellow at base, near the middle in front with 

 a large yellowish brown spot. 



From polita, it will be distinguished by the smooth front and the 

 strongly dilated hind tibire ; from tnherculata, by the front ; from all, 

 by the longer antennje, wings, size, etc. 



One specimen, Chapada. 



12. Lepiilostola ptilchra n. sp. 



% 9 ■ — Length 4.5 mm. Mesonotum with three bright yellow tomentose bands ; 

 fourth abdominal segment wholly shining. 



% . Antennse reddish yellow, the third joint brownish or brown ; longer than 

 the face, slender, first two joints of nearly equal length, third a half longer than 

 the first two together. Face in profile nearly perpendicular, with a gentle 

 convexity near the middle; densely yellow dusted : two spots on the tubercle 

 and a stripe on the cheeks black. Frontal triangle small, not swollen, with a 

 shining black spot ; vertical triangle yellowish dusted in front ; eyes briefly 

 contiguous. Mesonotum deep black, with a whitish pruinosity ; not shining, bare, 

 except three bands of bright yellow touientura ; the first band lies on the ante- 

 rior part, behind the humeri, and descends more slenderly obliquely backward 

 on the mesopleui"je, nearly to the middle coxje ; the middle band, the narrowest, 

 extends across just behind the suture ; the third, the broadest, forms an arc of a 

 circle on the posterior part, reaching nearly to the ends of the middle band. 

 Pleurte nearly black, lightly dusted ; behind the previously mentioned yellow 

 stripe there is another elongate spot, as though a continuation of the middle 

 dorsal baud, interrupted by the root of the wings. Scutellum triangular, black, 

 lightly pubescent. Abdomen black; the second and third segment on each side 

 with a large trapezoidal yellow spot, leaving an inverted T-shaped space on the 

 second, a more triangular space on the third, opaque black ; first segment, the 

 narrow edges of the two following, the narrow hind margin of the third, and 

 the remainder of the abdomen, wholly shining, somewhat metallic, black ; in 

 shape, the abdomen is very narrowly oval. Four front femora and tibise reddish 

 yellow; hind femora, except the base, and the hind tibise more brownish yellow 

 or brown; first two or three joints of all the tarsi yellow, distal joints brown. 

 Wings grayish hyaline; the elongate stigma, extending as a narrow cloud along 



