OF TTIE TABAXIDJ5 OF THE UNITED STATES. 437 



the middle, and the space occupied hjtlie hirge facets is much smallei-. The whitish yellow 

 pollen on the thorax is more dense, concealing the darker longitudinal stripes ; the pleurae 

 have a tuft of brown hair in the middle ; the discs of the discal and the posterior cells are 

 more distinctly grayish, less brown, so that in the discal cell a distinct limit is visible be- 

 tween a brownish shadow at the base and along the fourth vein, and the lighter color of the 

 disc ; (the females show the same coloring of the discal cell, but much less distinctly). The 

 abdomen is very distinctly roof-shaped towards the tip. Length, 19-20 mm. 



Hali. Six females and two males, caught by myself near Doubling Gap, in the Penn- 

 sylvania Momitains. 



Three females from Dallas, Texas (Boll), have the abdomen flatter, less roof-shaped ; 

 the white abdominal triangles are a little smaller, nari-ower, but more jwinted, and with a 

 more definite outline ; there is a distinct white line in the middle of the sixth segment (of 

 which there is not a vestige in the typical specimens) ; in other respects, the resemblance 

 between these specimens and those from Pennsylvania is veiy great, and I leave the ques- 

 tion of their specific identity in aliej'ance. I have seen a similar specimen from Tennessee 

 (C. V. Riley), and one from Virginia. 



T. tectns resembles T. ahdornliudls in general appearance very much; the male, as no- 

 ticed above, has a smaller head, the abdomen in both sexes differs in its outline, being more 

 narrowed posteriorly ; the coloring of the abdomen is more brownish than reddish, the 

 white triangles broader, less j-ellowish, the first posterior cell a httle less coarctate ; the 

 frontal callosity' usuallj^ darker and a little shorter, etc. 



8. Tabanus variegatus. 



Tabanus varieffxtus F;il)ricius, Syst. Antl., p. 95, 10; Wiedoniaiiii, Dipt. Exot., I, p. 67, 11 ; Auss. Zw., I 

 p. 120, 13. 



Tabanus sukifrons Mao<in.irt, Dipt. Exot., S' Suppl., p. .33, 127 (Macquart has fukifrons, evitlently a, 

 misprint). 



" Lilacino-rubidus ; abdomine badio, albo-maculato ; alls fusco-maculatis, margine iuterno 

 fusco-limbatis." 



{Translation.) "xbitenno3 brownish black, root of the third joint reddish yellow; flice 

 gray ; front cinereous, with a bro^^^l, smooth line, and an almost square callosity. Thorax 

 lilac reddish, with five whitish lines, in well preserved specimens with white hairs on the 

 sides, posteriorly. Aljdomen chestnut brown, verging into ferruginous brown ; the anterior 

 segments on the sides anteriorl}- with lJro^\•nish Ijlack spots, the fifth and the following 

 almost altogether black ; all the incisures, laterally, whitish ; the whitish triangular spots in 

 the middle of the segments end anteriorly, on the second and third segments, in a small 

 brown stripe ; last segment altogether black. Wings actually of a whitish color {loirkUeh 

 von loeisslicher Farhe) ; costal cell, apex and hind mai'gin pale l^rownish ; crossveins with 

 saturate brown clouds ; halteres brown with a whitish knob. Legs brown ; base of tibiae 

 ochre-brown. From Fabricius's collection. Length, 9 lines ; (19.5 mm.). 



'• Sab. North America." 



I translate Wiedemann's description, because he had Fabricius's specimens before him. I 

 possess three specimens from District of Columbia and Maryland, which agree with this 

 description. The middle portion of their wings is whitish, the hind margin has a distinct 



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ilEMOlRS BOST. SOC. NAT. HIST. VOL. U. HO 



