228 The Ohio Naturalist [Vol. XIV, No. 3, 



narrowed towards the antennae. The width and form of the front 

 and the modest brown and gray colors overlaid with a thin coating 

 of gray pollen are characters which easily separate longus from 

 the other two species considered in this paper. 



1. Female. This form is considered as corresponding to 

 the typical specimens described by Osten Sacken. Front widest 

 at vertex, gradually narrow toward antennae, frontal callosity 

 pale brown, sometimes darker or even nearly black, higher than 

 wide, with an unconnected spot above, antenna largely yellowish, 

 first two segments clothed with short black hairs, third segment 

 long and narrow with a distinct angle near the base on the dorsal 

 side, annulate portion clear black, cheeks and lower part of the 

 face with silky white hair, palpi white with white and black hairs 

 intermixed. Thorax brown with more or less obscured stripes 

 and gray pollen, wings hyaline, legs largely brown, apex of front 

 tibia, whole front tarsus and apical part of each middle and hind 

 tarsus darkened. Abdomen brown sometimes rather dark, 

 middorsal stripe gray, very narrow, usually abbreviated poster- 

 iorly; lateral rows of spots gray, each spot small and usually not 

 reaching either margin of its segment. Length 13-16 mm. Speci- 

 mens from northern Ohio and Eastern Kansas. 



Male. Very much like the female in color. Markings of the 

 abdomen quite distinct. Large and small facets of the eyes 

 plainly differentiated. Length 13-14 mm. Specimens from the 

 same localities as the female. 



2. Female. Smaller and of a clearer brown than number 1. 

 Annulate portion of the third segment of the antenna usually 

 brown and not black. In some specimens the middorsal stripe 

 is visible for nearly the entire length of the abdomen and the 

 lateral spots are distinctly larger. Altho structural characters 

 are quite uniform thruout this form and the next appear quite 

 different from typical longus. I have noted that in many species 

 of Tabanus, southern examples are likely to be smaller and of a 

 clearer brown than northern specimens of the same species. 

 Length 11-14 mm. Specimens from North Carolina and Kansas. 



3. Female. This iorm appears decidedly small but measure- 

 ment of length hardly indicates it because of the slendeniess of 

 the specimens. Coloration and appearance are suggestive of 

 form nimiber 2. The atennae are yellowish to the tip. Length 

 10-13 mm. Specimens from southwestern Georgia. 



