226 
The Ohio Naturalist. 
[Vol. XIV, No. 3, 
Tabanus sagax Osten Sacken. Middorsal abdominal stripe 
usually quite wide and extending the full length of the abdomen. 
Thorax without stripes, uniformly clothed with gray pollen. 
Front rather wide, sides nearly parallel; frontal collasity brown, 
nearly square and with a shining spot above it. Third antennal 
segment without an angulate prominence at base. 
1. Female. This appears to be the form Osten Sacken 
described as the type of the species. Front rather wide, frontal 
callosity shining brown, nearly square, almost as wide as the front 
and with a more or less connected denuded spot above it. Face 
and front with yellowish gray pollen, the former partially clothed 
with white down. Palpi stout, pale with black and white hairs 
intermixed. Antenna yellow with the exception of the annulate 
portion of the third segment which is clear black, first and second 
segments with some black hair above, third segment rather long 
and narrow and without a pronounced basal prominence. Thorax 
gray or with a shade of yellowish and without stripes, wings 
hyaline, costal border pale yellowish; legs largely yellow, front 
tibia darker apically on account of the presence of black hairs, 
front tarsus and tips of the other tarsi more or less brown. Abdo¬ 
men brown in general color, dorsal stripe nearly white, wide, 
expanded at the incisures, lateral rows of spots not very con¬ 
spicuous but apparent on segments two to six inclusive. Length 
13-15 mm. Specimens from Illinois, Massachusetts and New 
Jersey. 
2. Female. A second series is composed of similar specimens, 
the thorax is yellower, the color of the abdomen is lighter brown, 
the dorsal stripe usually is narrower and the lateral spots are 
more conspicuous, while the tarsi are not so brown and in some 
specimens the annulate portion of the third antennal segment is 
yellow like the basal part or the coloration may vary thru different 
shades of brown. Length 11-12 mm. Specimens from north 
western Louisiana. 
3. Female. Specimens of a third series are smaller still, the 
width of the thorax and abdomen is decidedly less than in the 
other two groups. The general color is a slightly darker brown. 
The middorsal stripe is quite narrow" and the lateral abdominal 
spots are small altho pronounced. The antennae are entirely yel¬ 
low" or the annulate portion of the third segment is some shade of 
brown. Length 9-11 mm. Several specimens from De Soto 
Parish, Louisiana. 
Tabanus fulvulus Wiedemann. Middorsal abdominal stripe 
running the entire length of the abdomen, distinct, wddened on the 
posterior border of each segment and with a row of distinct spots 
on either side. Thorax uniformly pollinose so that no stripes are 
visible. Front plainly narrower than in either sagax or longus. 
