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 ^^ellowish; 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 arc small altho pronounced. The antennae arc 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 Wicrlcmann. Middorsal abdominal strii)e 

 running the entire length of the abdomen, distinct, widened on the 

 posterior border of each segment and with a row of distinct spots 

 on cither side. Thorax uniformly pollinose so that no stripes are 

 visible. Front plainly narrower than in cither sagax or longus. 



