256 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.46. 



surface hairs not very distinct nor numerous; scutellum short and 

 broad, outline rounded, marginal bristles four in number the apical 

 pair strong, not approximated at base, the basal pair much weaker, 

 hairlike. Legs normal; hind tibial spur short, about equal to tibial 

 diameter, curved, and situated near to apex. Wings with third 

 costal division over one-half as long as second; venation normal. 



Length, 1-L 5 mm. 



D&scribed from type-specimens. 



Type-locality.— Fajsivdo, Porto Rico, Februar}^, 1899 (A. Busck). 



Paraty pes. ^UtusLdo, Porto Rico, January, 1899 (A. Busck); 

 Managua, Nicaragua (Baker); Tabogo Island, Panama, July, 

 (A. Busck); and Cordoba, Vera Cruz, Mexico (Dr. A. Fenyes). 



The specimen from Mexico has the dorsum of mesonotum almost 

 black. It might be possible to place this single specimen by using 

 Becker's table for the species in Hippelates, but the type form would 

 be very difficult to locate in it. 



19. HIPPELATES EQUALIS Williston. 

 Hippelates equalis Williston, Trans. Ent. Soc. Lond., 1896, p. 419. 



Male and female. — Front broad, the very large shining black triangle extends to 

 near the root of the antennae; remainder of the front opaque black. Thorax light 

 reddish yellow, the mesonotum shining. Scutellum flattened, subquadrate, the 

 marginal bristles remote from each other on the angles. Abdomen reddish yellow, 

 the distal segments somewhat obscure. Legs wholly light yellow; spur of the hind 

 tibia long, curved and black. Wings grayish hyaline; second and third sections of 

 the costa of nearly equal length. 



Length, 2 mm. 



Four specimens. St. Vincent. This species is related to H. pallidus Loew, but 

 will be distinguished by the color of the front. 



The above is a copy of Williston's description of equalis. The 

 species is more closely allied to subequalis than to pallidus, but is 

 evidently quite distinct. I have not seen this species. 



20. HIPPELATES FLAVIDULA, new species. 



Male. — Pale, shining, reddish yellow; ocellar spot, a small spot 

 on third antenna! joint at insertion of arista, a spot on lower anterior 

 portion of mesopleura, and abdomen brown black. Wings clear, 

 veins brownish. Bristles and hairs on body black. 



Frons slightly over one-third the width of head; triangle glossy, 

 occupying over two-thirds the width of vertex, extending over 

 halfway to anterior margin of frons, sides slightly convex, apex 

 obtuse; frontal stripe opaque, surface hairs rather numerous, but 

 short; antennae of moderate size, third joint rounded in front; arista 

 brown, distinctly longer than width of frons, pubescent; cheeks 

 narrow, not over one-half as high as width of third joint of antenna; 

 proboscis short, yellow. Mesonotum impunctate; hairs arranged in 

 rows, but not very numerous nor distinct; scutellum convex, the 



