June, 1920] Horseflies From Middle America 315 



Female. Front about three-fourths of a milHmeter in width, yellow- 

 ish pollinose, sides parallel, frontal callosity at the lower angle of the eye 

 about one-third as wide as the front, shining brown, gradually narrowed 

 and entirely disappearing slightly before the vertex; face yellowish pol- 

 linose, beard pale yellow, antenna reddish basally dark brown apically, 

 first segment enlarged and black haired above, third segment with a 

 slender basal projection which is more than a third of the 

 length of the segment; palpi pale brown and largely black haired. 

 Thorax purplish brown and largely clothed with pale yellowish vestiture 

 especially on the sides; a minute tuft of very pale hair immediately in 

 front of the attachment of each wing and just beneath a small round 

 patch of intense black hair producing a conspicuous spot from which 

 the insect is named. Immediately in front of the scutellum on the mid- 

 dorsal line a short and a narrow transverse patch of intense black hair 

 limited at either end by a minute tuft of nearly white hair. Wings 

 brownish all over, stigma intense brown; legs reddish brown, tarsi 

 darker than the other parts. Abdomen darker than the thorax but of 

 the same general color, black haired and without markings, except a 

 small area of white hair on each posterior lateral margin of each of 

 segments one to four. 



Holotype female from San Carlos, Costa Rica, and one 

 paratype female from Carillo, Costa Rica, collected by Schild 

 and Burgdorf, in the United States National Museum. A 

 paratype from vSan Carlos, Costa Rica, by the same collector, 

 and another simply labelled Costa Rica, in my collection. 



The last mentioned specimen was named Tahanus dephilippi 

 when I received it, but there is no reason for confusing piincti- 

 pleura with the last named species, for they are entirely distinct. 



Tabanus fumomarginatus n. sp. 



Wing veins margined with fuscous, general color of the body brown, 

 a conspicuous round black spot on the scutellum margined with gray 

 pile. Length IS millimeters. 



Front about a half millimeter in width, sides parallel, frontal cal- 

 losity shining brown, at the angle of the eyes distinctly narrower than 

 the front and gradually narrowed to its termination half way to the 

 vertex; antenna dark reddish, darker towards the apex where it is 

 nearly black, first segment much enlarged, produced forward above, 

 largely black hairy; third segment slender, with a basal prominence 

 only, basal portion very distinctly longer than the annulate portion. 

 Palpi pale in color, enlarged basally and narrowed towards the apexes. 

 Eyes bare. Thorax rubbed somewhat but with pale stripes, ground 

 color brown; scutellum with a conspicuous round black spot margined 

 with a ring of light pile, part of which is on the posterior margin of the 

 mesothorax, wings quite dark approaching fuscous, distinctly darker 

 along the margins of the veins than elsewhere. Legs dark brown, front 

 femora above and all of the tarsi nearly black, front tarsal segments 



