2 8 The Ohio Naturalist. [Vol. VII, No. 2, 



wise it looks much like a small specimen of lineola. The first 

 segment of the antenna is enlarged and clothed with black hairs 

 above, the third segment is red with the annulate portion black, 

 basal portion rather wide with a prominent angle above; all the 

 femora and tarsi black, anterior tibia at base and the other tibiae 

 in their entiretv yellow; thorax dark; abdomen very dark brown, 

 middorsal stripe entire, white and narrow, lateral stripes yellow- 

 ish, reaching the third segment. 



Specimens from San Carlos, Costa Rica, measure 13 mm. in 

 length. 



Tabanus truquii Bellardi. General color dark, something like 

 the darker specimens of lineola, female abdomen darker than 

 that of the male. Eyes pilose, although this character in the 

 female is not conspicuous; first segment of the antenna much 

 enlarged, dark red with black hairs above, basal portion of the 

 third segment dark red, a well developed angle above, annulate 

 portion brown; thorax dark, sparsely clothed with gray pollen, 

 wing hyaline with a narrow dark brown stigma, front leg except 

 basal part of tibia, middle femur at base and tarsus, posterior 

 femur at base and apex of tibia and entire tarsus, black, otherwise 

 legs red. 



Female: Length 1(5 mm., front with sides parallel, clothed 

 with brownish-yellow pollen; abdomen dark with three white 

 stripes, middle one entire, lateral ones reaching the third segment. 



Male: Length 15 mm., head of normal size, convex; eyes 

 decidedly pilose, facets all nearly of the same size; abdomen not 

 so dark colored as in the other sex, middorsal stripe narrow, 

 lateral stripes not plainly defined. 



Specimens from Sanarate and Panzos, Guatemala, taken in 

 February and March. 



Tabanus unistriatus n. sp. This species is a miniature of 

 modestus in general appearance but the front is much narrower 

 in proportion and there are no lateral stripes on the abdomen. 

 Antenna red, first segment enlarged, third segment with an angle 

 above and with its annulate portion black and not over half as 

 long as the basal portion ; front narrow, decidedly narrower below 

 than above, callosity elongate, shining; thorax black, sparsely 

 clothed with greenish-yellow pollen, wings uniform dilute brown- 

 ish, legs with all the femora and trasi and the apical half of the 

 anterior tibiae black, other parts red; abdomen black above with 

 a narrow middorsal white stripe reaching the end of the sixth 

 segment. 

 • Length of the female 7-9 mm. The male was not procured. 



Habitat: S])ecimens from San Carlos, Costa Rica, are the 

 property of the U, S. National Museum. 



