OF THE TABANIDiE OF THE UNITED STATES. 443 



imens I perceive a short, black pubescence, covering the whole dorsum). Pleura3 brown, 

 clothed with dense whitish pollen and white hairs ; a fringe of black hairs back of the 

 humerus. Abdomen brown, with a comparatively small triangular or subtriangular white 

 spot in the middle of the hind margins of each segment ; lateral margins of the segments 

 whitish. Venter brown, with a whitish pollen on the sides, leaving a more or less distinct 

 broad, brown longitudinal stripe in the middle. Legs almost uniformly reddish brown, tips 

 of front tibia3 and the tarsi but little darker. Wings unicolorous, very distinctly tinged 

 with pale brownish ; first posterior cell broadly open. Length, 23-25 mm. 



Male. I have a single specimen, which, I have no doubt, belongs to this species. The 

 face is brownish gray ; the body more uniformly brown. The head is large, but less sub- 

 hemispherical than in T. ahdominalis, coffeatus and trhnacidahcs ; the division of the 

 large and small facets is well marked; the eyes, in tlie dry specimen, are altogether 

 unicolorous. Length, 20-21 mm. 



Hah. Canada (Belanger, Couper, Provancher) ; Nahant, Mass. (Prof. L. Agassiz) ; Suf- 

 field. Conn. (G. Dimmock) ; Beverly, Mass. (E. Burgess). The male specimen is from the 

 State of New York. I have eight females and one male. 



This species will be easily distinguished from T. Actaon by its large size, the coloring of 

 the abdomen, the non-coarctate first posterior cell, etc. ; but most easily by the coloring of 

 the front tibiae, which in T. Adcpon are almost whitish yellow at the base, and much darker 

 towards the tip. The eyes of T. Orion ? , seem to be unicolorous ; at least softening on 

 wet sand did not bring out any stripes on them. 



15. Tabanus Actcson n. ^\<. 



Female. Paljji brownish red, densely clothed with short black hairs ; face whitish, with 

 white hairs ; front grayish, mixed with brownish in the middle ; in well preserved speci- 

 mens with some short blackish hairs on the vertex ; frontal callosity dark brown (in one of 

 the specimens brownish red), tapering off- into a linear prolongation. Antennae reddish, 

 with black hairs on the basal joints ; third joint reddish at base, the remainder dark brown 

 and black ; its upper angle sharp, projecting ; the narrow portion of the third joint is 

 rather elongate. Ground color of thorax reddish brown ; nevertheless the i^revailing color 

 of the dorsum is black, in consequence of four black, nearly coalescent strijies, the two 

 middle ones not reaching the scutellum ; these black stripes, in well preserved specimens, 

 are separated by lines of gray pollen. Pleurae grayish white. Abdomen brownish red or 

 reddish brown ; a comparatively small white triangle in the middle of the hind border of 

 each segment, surmounted by a dark spot, which connects it with the edge of the preced- 

 ing segment ; incisures and lateral margins of segments whitish. Venter clothed with a 

 dense whitish pollen, and with a broad brown longitudinal stripe in the middle. Femora 

 brownish, with whitish pollen and whitish hairs ; front and middle tibios whitish yellow, 

 brown towards the tiji ; the hind tibia? brownish yellow or yellowish brown. Wings unicol- 

 orous, with a uniform, pale brownish tinge ; first posterior cell very slightly attenuated. 

 Length, 19-21 mm. 



Hah. Massachusetts; Connecticut; Minnesota; Wisconsin; Canada. Seven female 

 specimens. The eyes of this species seem to be unicolorous. 



