OF THE TABANIDJE OF THE UNITED STATES. 557 



Female. Thorax grayish brown, with grayish lines ; abdomen brown, posterior margins 

 of the segments white, expanding into large triangles in the middle ; fork of third vein 

 and crossveins at the base of all posterior cells spotted with brown. Length, 16-17 mm. 



Face white, Avith white hairs ; palpi reddish, moderately stout, beset with whitish and 

 black hairs ; front brown, gray towards the vertex ; callosity reddish brown, with a spindle- 

 shaped prolongation ; antennse brownish red, third joint with an angular, well marked 

 upper corner, the annulate portion shorter than the joint. Thorax pale brownish, grayish 

 pollinose, with longitudinal grayish white lines and whitish hairs ; a stripe of dark brown 

 pile between the root of the wing and the humerus ; pleurae whitish, with white hairs ; 

 scutellum of the same shade of color as the thorax. Abdomen brown, hind margins of 

 the segments white, the white borders expanding on the sides and still more in the middle, 

 where they form large white triangles, especially on segments two to five ; a white stripe 

 in the middle of segment six ; venter reddish, brownish towards the tip ; posterior margins 

 of segments white. Legs reddish brown ; tibitB more reddish at the base, femora with 

 white pile. Wings slightly tinged with grayish brown, with a distinct bluish opalescence ; 

 the bifurcation of the third vein and the crossveins at the base of the second and third 

 posterior cells bear large brown clouds ; smaller clouds on the other crossveins ; first pos- 

 terior cell somewhat coarctate. 



Hah. Georgia (H. K. Morrison) ; two males and two females. 



There is a great difference in the coloring between the two sexes, especially in the tho- 

 rax and the scutellum, nevertheless I do not doubt that they belong together. The male is 

 a remarkably handsome insect ; the female has a superficial resemblance to the smaller 

 specimens of T. Reinioardtii, but is easily distinguished by the absence of the lateral white 

 spots on the abdomen. 



Tabanus exul n. sp. 



A large number of well preserved specimens of T. ahdominalis have enabled me to 

 recognize the true character of this species, and to distinguish it very easily from the speci- 

 mens with an open first posterior cell and broad front, mentioned at the end of my descrip- 

 tion on p. 436. The latter constitute a different species, which I call T. exul. 



As my description of T. ahdominalis was princiiDally based on a small and very abnor- 

 mally colored specimen, I prefer to give a description of both species. 



T. abdomiualis. First posterior cell closed ; front naiTow, frontal callosity narrow, elongated. Length 

 18-22 mm. 



Female. Face pale yellowish gray, with pale colored hair on the cheeks ; palpi black ; 

 front narrow, yellowish gray, mixed with brownish ; frontal callus narrow, much longer 

 than broad, black or dark brown ; a linear prolongation above ; basal joints of the antennge 

 very dark, and clothed with short, black pile ; third joint red, rather broad, with a rectan- 

 gularly projecting upper angle ; annulate portion generally darker, brownish. Thorax 

 brownish gray, with alternate gray lines and darker stripes ; the former are clothed wath 

 short, golden yellow hairs. Pleurae of a dingy yellowish gray, with hairs of the same 

 color ; a tuft of black pile in the middle, and a fringe of such pile between the humerus 



UEMOmS BOST. BOC. NAT. HIST. TOL. □. 140 



