222 
The Ohio Naturalist. 
[Vol. VIII, No. 2, 
therefore, that these more remote localities may be investigated 
in the near future, and that the collections made be studied with 
a view to making our knowledge of North American Tabanidae 
as complete as it appears desirable to make it. 
The generic characters in the Tabanidae are not abundant, 
so the family cannot be divided up as many other families are. 
For example, the genus Tabanus, as at present restricted, is very 
large, containing not less than 1,-300 species from all parts of the 
world. Even the large number of species indigenous to the Ne- 
arctic region makes it difficult to recognize all of them, especially 
if the descriptions are poor. There are a number of names placed 
under the genus that have never been used expect on type speci¬ 
mens, but future collecting will make it possible, no doubt, to 
more fully establish many of these. I have studied all the des¬ 
criptions known to me, and now and then have found specimens 
that do not appear to fit any of them. During several years of 
collecting and study, therefore, a number of specimens have 
been set aside as undescribed. Some of these are named at this 
time in order that it be possible to refer to them definitely in the 
future. 
Tabanus muscoideus n. sp. Length 9 millimeters. A species 
nearly the size of our common Sarcophagids and on account of the 
plainly striped thorax and black and white abdomen resembles 
these flies very closely. 
Female. Front wide and clothed with gray dust but with a 
black area at the vertex; frontal callosity half as wide as the front, 
gradually narrowed above and coming to a point half way to 
vertex. Antenna black, short, first segment small, third wide 
at base and rapidly narrowed toward the annulate portion which 
is of nearly the same length as the basal portion. Palpi reddish 
brown, less than half as long as the proboscis. Thorax black, with 
very prominent gray stripes, legs black, front coxae very long, 
nearly two-thirds the length of the femora; wings hyaline, only the 
anal cell closed. Abdomen black in ground color, first segment 
with a small white spot behind the scutellum, second segment 
with a middorsal gray stripe and narrow posterior gray margin, 
other segments each with a posterior gray margin which is 
slightly widened at each end and at the middle. The abdomen 
is distinctly pointed posteriorly, a character which appears to 
be characteristic of the species. 
Females taken at Panzos, Guatemala, March 18, 1905, from 
the back of a mule which was staked out to pasture. 
This is a most peculiar species but, although it has a peculiar 
appearance, there appear to be no characters which would war¬ 
rant erecting a genus for it. 
Tabanus maculifrons n. sp. Length 8 millimeters. A dark 
colored species with hyaline wings and a narrow gray posterior 
