316 The Ohio Journal of Science [Vol. XX, No. 8, 



distinctly wider than those of the other feet, all of the posterior cells of 

 the wings open, furcation of the third vein without an appendage. 

 Abdomen brown, somewhat darker dorsally than ventrally, posterior 

 margins of the segments dorsally narrowly pale and each expanded into 

 a gray triangle at the middle. The middorsal row of triangles does not 

 show conspicuously for the description is taken from alcoholic material. 



Holotype female and a paratype female from Rio Caiary, 

 Uaupes, State of Amazonas, Brazil, H. Schmidt, collector, in 

 the American Museum of Natural History. A paratype with 

 the same date in my collection. 



I have a half dozen species of Tabanus with the conspicuous 

 spot on the scutellum, but this is fully distinct from any of 

 them. The widened front tarsi are useful in determining this 

 insect. 



Dichelacera melanosoma n. sp. 



Body shining black, except the first abdominal segment. Wing pure 

 black with hyaline markings. Length of the female 12 millimeters. 



Front dark gray pollinose, frontal callosity shining black, as wide as 

 the front, nearly square, acute angulate above and with a short linear 

 extension towards the vertex. Antenna largely pale although much of 

 the third segment is black, especially the annulate portion ; basal exten- 

 sion of the third segment slender and more than half as long as the 

 segment, palpi black, facial callus ver}' prominent and shining black. 

 Dorsum of the thorax plain black, including the scutellum; front leg 

 black except the basal half of the tibia which is white, middle and hind 

 femora black, tibiae and tarsi white; wing black with the axillary cell, a 

 median posterior half band and the wing margin between apex and the 

 fifth posterior cell hyaline. The hyaline half band includes the narrow 

 apexes of the second basal, discal and fourth posterior cells and a large 

 part of the fifth posterior forming an area of uniform width which 

 reaches from the middle of the wing to the posterior margin. See Figure 

 1. Abdomen dorsally, first segment nearly white, other segments clear 

 black. 



Holotype female from Higuito, San Mateo, Costa Rica, 

 collected by Pablo Schild. In the United States National 

 Museum. 



Dichelacera analis n. sp. 



Length of the female 10 millimeters. Front gray pollinose, frontal 

 callosity at the lower corner of the eyes as wide as the front, higher 

 than wide, acutely angulate above; face entirely gray pollinose without 

 a shining callus at the middle as in damnicornis. Palpi pale, antenna 

 pale basally, apical half of the third segment black, basal extension of 

 the third segment pale, slender, somewhat curved, more than half the 

 length of the segment. Thorax dorsally pale, a clear brown band dis- 



