NO. 2024. FLIES IN SUBFAMILY BOTANOBIINM—MALLOCH. 243 



bare, slightly longer than high. Mesonotum with the hairs in three 

 single rows anteriorly, those on outer rows double on posterior half, 

 the disk is otherwise bare, except for sometimes 2-3 weak hairs 

 between the rows anteriorly; surface of both mesonotum and scu- 

 tellum finely granulose; scutellum with disk slightly flattened and 

 almost bare; the apical pair of bristles are very closely approximated, 

 the bases set in very minute tubercles, other marginal hairs short. 

 Basal two segments and apex of last segment of abdomen yellowish. 

 Hind tibial spur longer than diameter of tibia, situated close to apex. 

 Wings with third costal section one-half as long as second ; outer cross 

 vein slightly oblique; last section of fifth vein slightly longer than 

 penultimate section of fourth; veins 2-3 straight; 3-4 very slightly 

 divergent at apices. 



Length, 1.5-2 mm. 



Type.—Csit. No. 15959, U.S.N.M. 



Type-locality. — Frontera, Tabasco, Mexico (C. H. T. Townsend). 



Paratypes. — Frontera, Tabasco, Mexico (C. H. T. Townsend) ; 

 Vieques Island, Porto Rico, February, 1899 (A. Busck). 



3. HIPPELATES "NITIDIFRONS, new species. 

 Figs. 35, 36, 



FeTTiale. — Glossy black; anterior margin of frons, face, antennse ex- 

 cept upper half of third joint, base and venter of abdomen, and legs 

 yellow. Wings clear, veins except costa and first vein colorless. 

 Bristles and hairs on thorax and abdomen brownish yellow; tibial 

 spur black. 



Frontal triangle elongate, reaching to almost the anterior margin 

 of frons, occupying almost the entire width of vertex, about one-third 

 longer than broad, its sides slightly convex; margins of triangle and sur- 

 face of frontal stripe Avith pale hairs; sides of frons slightly divergent 

 anteriorly, its breadth at center almost one-third more than that of either 

 eye; eyes bare, distinctly, but not greatly, higher than long; antennas 

 rather small, third joint rounded; arista slightly pubescent, about 

 equal in length to breadth of frons; cheeks equal in height to third 

 antenna! joint; proboscis rather shorter, and more fleshy, than that 

 of preceding species. Lateral rows of hairs on mesonotum double 

 from near anterior extremity, the hairs between them carried well 

 back toward scutellum; mesonotum finely, scutellum coarsely granu- 

 lose; apical scutellar bristles not so closely approximated as in nudi- 

 frons and the bases not set in such distinct tubercles. Tibial spur 

 longer than diameter of tibia and set well up from apex. Wings with 

 venation similar to nudifrons. 



Length, 1.5-2 mm. 



Type.— C&t. No. 15960, U.S.N.M. 



Type-locality. — Jacksons Island, Maryland (H. S. Barber). 



