June, 1920] Horseflies From Middle America 



317 



tinctly convex before and slightly so behind between the wing attach- 

 ments; scutellum clear brown; front femur pale basally, dark apically, 

 front tibia and tarsus dark although the tibia is lighter colored basally, 

 middle femur entirely pale, middle tibia and tarsus brown, hind femur 

 pale except at apex where it is black, hind tibia and tarsus black. Wing 

 black as follows: costa including most of the first basal cell, nearly all 

 of the anal cell, apex of the wing beyond the furcation of the third vein 

 and a band beginning at the third vein before its furcation and extend- 

 ing to the posterior margin, also the posterior margin is lightly infus- 

 cated for nearly its entire length including the apical half of the axillary 

 cell. See Figure 2. Abdomen dorsally, first segment pale, second seg- 

 ment nearly black, third and fourth segments black, each with a narrow 

 posterior pale yellow margin, following segments black. 



Length of the male 10 millimeters. Colored like the female, but the 

 vestiture of the body is longer in this sex. 



1. Dichelacera melanosoma. 



2. D. analis. 



3. D. melanoptera. 



4. D. caloptera. 



Holotype female, allotype male and eight paratype females 

 from Higuito, vSan Mateo, Costa Rica, collected by Pablo 

 Schild, in the United States National Museum. Two paratype 

 females with the same data in my collection. Ten paratype 

 females from Gatun, Canal Zone, collected by D. E. Harrower, 

 July, in my collection. 



The species resembles damnicornis, but does not have a 

 shining facial callus as that species and the wing markings are 

 differently arranged. It suggests alcicornis somewhat, but has 

 the thorax banded instead of striped. 



Dichelacera melanoptera n. sp. 



Length of the female lU millimeters. A dark colored species with 

 uniformly colored nearly black wings. All the tibia white except at the 

 apexes where they are dark brown. Thorax dorsally and anterior part 



