April, 1920] Horseflies From Middle America 187 



Legs colored like the body, apical part of front tibia and all the tarsi 

 darker. 



Holotype female taken at Gatun, Canal Zone, July, by 

 D. E. narrower. In my collection. 



Tabanus festivus n. sp. 



Length 15 millimeters. Whole body yellowish brown abdomen 

 darker towards the tip, palpi slender and elongate nearly as long as 

 the proboscis. First segment of the antenna nearly cylindrical, third 

 segment with the basal process long and slender reaching beyond the 

 beginning of the annulate portion of the segment, front very narrow, 

 sides nearly parallel, frontal callosity elongate and slender, nearly 

 reaching the vertex. Wing glossy yellowish to the stigma and the apical 

 third of the discal cell, from thence to the apex intense brown with the 

 exception of two rather small reniform hyaline spots one in the marginal 

 and the other in the first submarginal cell. Just behind the stigma the 

 color is nearly black, giving the effect of a small rectangular spot. First 

 posterior cell closed. 



Holotype female from Gatun, Canal Zone, taken by D. E. 

 Harrower, in my collection. 



A paratype from Lion Hill, Canal Zone, taken by August 

 Busck, in the U. S. National Museum. 



Two other specimens from Gatun, Canal Zone, and one from 

 Costa Rica. 



Tabanus murreus n. sp. 



Length 15 millimeters. Color pale yellowish, abdomen slightly 

 darker toward the tip. Apex of the front tibia and its tarsus fuscous. 

 Third segment of the antenna with a long, slender, basal process, palpi 

 long and slender; front very narrow, frontal callosity linear and reach- 

 ing the vertex. Wing glossy yellowish, more intensely colored on the 

 margins of the veins. Behind the stigma and widening toward the 

 posterior margin is a rather pronounced brown area. Apex of wing from 

 a line drawn from the distal end of the stigma to the tip of the third 

 vein grayish hyaline encroached upon by diffuse brownish in the region 

 of the apex of the first submarginal cell. First posterior cell wide open, 



Holotype female from Bartica District, British Guiana, in 

 my collection. 



Tabanus umbratus n. sp. 



Length 15 millimeters. General color dark brown, darkest toward 

 tip of the abdomen, fourth abdominal segment with a light triangle 

 produced by gray vestiture in the middle of the dorsum with its base 

 on the posterior margin of the segment. Third segment of the antenna 

 with a slender basal process about half as long as the segment, general 



