2 2 The Ohio Naturalist. [Vol. VII, No. 2, 



11. Middorsal stripe clear yellow, wings with some of the longitudinal 



veins margined with pale brownish. stenocephalus n. sp. 



Middorsal stripe gray, wings uniform dilute brownish or hyaline. 12. 



12. Wings clear hyaline, eyes pilose. truquii Bellardi 

 Wings dilute brownish, eyes not pilose. 13. 



13. Abdomen dark brown, front of the female unusually narrow. 



trivittatus Fabr. 

 Abdomen black, front of the female of normal width. 14. 



14. Small species, no lateral stripes on the abdomen, unistriatus n. sp. 

 Medium sized species, short lateral stripes on the abdomen. 



modestus Wied. 



15. Front and thorax gray. 16. 

 Front and thorax yellow. 17. 



IG. Length 9 to 11 millimeters, head of the male very small. 



nigrovittatus Mac quart 

 Length 12 to 14 millimeters, head of the male large. 



conterminus Walker 

 17. Eyes with a single green band in life, costal cell distinctlv colored. 



costalis Wied. 

 Eyes with two green bands in life, costal cell nearly hyaline. 



quinquevittatus Wied. 



Tabanus acutus Bigot. General color, light brown; first two 

 segments of the antenna and the base of the third light brown, 

 apex of the third darker; wings wide, light brown and with a 

 small dark spot at the furcation of the third vein ; legs concolorous 

 with the body, apex of each anterior tibia and all the tarsi 

 darker; abdomen light brown, a little darker toward the apex, 

 with a middorsal, wide, gray stripe extending for the whole 

 length. 



Female: Length L5-19 mm., head rather small, face and 

 front clothed with yellowish pollen, front of normal width, sides 

 parallel, frontal callosity large, shining chestnut in color, inferi- 

 orly not quite as wide as the front, narrowed slightly above and 

 with a connected line extending more than half way to the 

 vertex, abdomen elongate, conical, gradually narrowed toward 

 the apex. 



Male: Length 14- Hi mm., head rather small, hemispherical ; 

 abdomen quite noticeably narrowed to two thirds of its length, 

 sides nearly parallel from thence to apex. 



Habitat: Several males and females taken along the 

 Mississippi River below New Orleans, also one female from 

 Cameron near the Gulf Biologic Station. 



It seems certain that the identification is correct in this case, 

 for the species is such a striking one that a short description is 

 suiTficient to fully characterize it. Bigot placed it in the sub- 

 genus Atvlotus btit it docs tiot belong there. 



Tabanus appendiculatus n. sp. General color fuscous; first 

 segment of the antenna large, clothed with short black hairs 

 above, entire antenna reddish with the exception of the annulate 

 portion of the third segment which is darker, wing hyaline with a 



