28 
The Ohio Naturalist. 
LVol. 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 entirety 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 16 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: Specimens from San Carlos, Costa Rica, are the 
property of the U, S. National Museum. 
