188 The Ohio Journal of Science [Vol. XX, No. 6, 



color of the whole antenna fuscous ; palpi elongate slender slightly more 

 than half as long as the slender proboscis, front rather narrow, frontal 

 callosity widest below and narrowed above reaching about three- 

 fourths of the distance to the vertex. Thorax faintly striped; legs pale 

 brown, tarsi slightly darker; wings hyaline with an irregular fuscous 

 band averaging nearly three millimeters in width extending from the 

 costa to the posterior margin in the region of the stigma. No stump on 

 the anterior branch of the third vein, first posterior cell wide open, most 

 of the anal cell very slightly infuscated. 



Holotype female from Huguito, San Mateo, Costa Rico, 

 collected by Pablo Schild. In the U. S. National Museum. 



Tabanus validus n. sp. 



Total length 16 millimeters. Body unusually robust. Thorax brown 

 with very faint gray stripes, especially anteriorly, abdomen distinctly 

 paler in color than the thorax, but darkened apically and with a very 

 small patch of yellow hairs in the middle of the dorsum on the posterior 

 margin of each of segments two to six. First antennal segment enlarged 

 and produced into a distinct angle dorsally where it is furnished with 

 short black hairs ; third segment mostly black with a long slender basal 

 process which is about half the length of the segment. Front narrow, 

 frontal callosity widest below, gradually narrowed above and visible 

 for about three-fifths of the distance to the vertex. Wings nearly 

 hyaline, front border only faintly yellowish, first posterior cell wide 

 open, anterior branch of the third vein without a stump. Legs dark, 

 nearly uniformly colored throughout, hind tibia distinctly ciliate out- 

 wardly with a dense row of fine dark hairs. 



The species shows some relationship with members of the 

 genus Stibosoma. 



Holotype female from Higuito, San Mateo, Costa Rico, 

 collected by Pablo Schild. In the U. S. National Museum. 

 Paratype with the same date in my collection. Two other 

 specimens in the U. S. National Museum, one, only 13 milli- 

 meters in total length. 



Tabanus modicus n. sp. 



Total length of the body 11 millimeters. Whole body black with a 

 whitish bloom especially on the thorax and base of the abdomen. Palpi 

 rather slender, pale, with sparse dark colored pile, somewhat shorter 

 than the proboscis. Antenna yellow, first segment slightly produced 

 forward above and furnished with black pile, third segment angulate 

 above near the base and with a tip of black pile but not drawn out into 

 a process. Front moderately narrow, frontal callosity below practically 

 as wide as the front, shining black, widest portion distinctly longer than 

 wide, then gradually narrowed to a line which connects with a shining 

 area at the vertex. Thorax without apparent stripes, wing fuliginous, 



