OF THE TABANID/E OF THE UNITED STATES. 447 



third and fourtli segments. Venter blackish, clothed with a white pollen, and Avith whitish 

 incisures. Legs black, beset with whitish hairs ; tibioc more or less reddish at base. Wings 

 hyaline, stigma brown ; first posterior cell open. Length, 14 mm. 



The description was drawn from a very well preserved specimen which I took at 

 Trenton Falls, in July, 1874. I have another, less well preserved specimen, from Maine. I 

 also refer to this sj)ecies a female, from a doul>tful locality (Massachusetts?) too much faded, 

 however, to make it worth while to describe it. 



The shape of the head of the described male specimens is very like that of T. nlvosus, it 

 is rather large, but not subhemispherical ; there is a very well marked division between the 

 large and the small facets. In size and shape the males of these two species are very much 

 alike, but are easily distinguished bj- the prevalence of the whitisli color on the abdomen 

 of the one, and of the black on the abdomen of the other. 



I introduce this imperfectly described species only to draw the attention of collectors to 

 these closely related species, which, in outward appearance, bear also much resemblance to 

 T. asiufus and T. microcephaliis of the group with pubescent eyes and small-headed mules. 

 (Compare the observation at the end of the description of T. aslutus.) 



Wiedemann's description of T. marglnalis (female) applies better to the present species 

 than to any other, proper allowance l)eing made for the diflerence of sex. Nevertheless, 

 the identification is very doubtful ; nor is it certain whether Wiedemann and Fabricius, 

 whom he quotes, described the same species. 



21. Tabaniis longus n. sp. ^'^'^ ^'^ff' T-^ 



Female. Front moderately broad, l)ro\vnisli cinereous, with blackish hair ; callosity 

 square, black, rather convex ; above it, and oonneotod with i ^, an indefinite, elongate, 

 blackish and somewhat shining spot ; antenna^ : two basal joints reddish, clothed with 

 blackish hair ; third joint variable in coloring, either blackish, with the base alone reddish, 

 or reddish, with the annulate portion black; the body of the joint is of moderate breadth, 

 with a well marked, although obtuse , upper angle ; face white, Avith Avhite doAvn ; palpi 

 rather stout, yellowish Avhite, Avith small black hairs. Thorax grayish black, Avith very 

 faintly marked gray lines ; sides of the dorsum often reddish ; pleurae and pectus grayish 

 white. Al:)domen rather long and comjiaratively narroAv (the sixth segment longer than 

 in the allied species, but little shorter than the preceding one), grayish Idacl ' i , i- omo - 

 timcj reddi.ih on the rides, near thu bane; on segments one to six on each side a roAV of 

 AA'cll marked, oval, oblique, Avhitish spots, usuallv (l)ut not always) not coalescent AA'ith the 

 Avhitish hind margins of the segments ; in the middle of the abdomen a fiiint, Avhitish, lon- 

 gitudinal line, expanded at the incisures, thus forming a series of faint triangles, Avith a 

 rather broad basis, but a very narrow, linear apex. Venter light gray, clothed Avith minute 

 AAdiite hairs; the sides are sometimes reddish. Legs reddish broAvn, clothed Avith a graj'ish 

 pollen ; tarsi broAvn, the basis of the four posterior tarsi paler. Wings grayish hyaline ; 

 oriL-fni ^^c^\ pnio yonniv;..-li l^vnivn : stlguia palc broAA'u ; first posterior cell broadly oj^en. 

 Length, 12-14 mm. 



Hah. Middle States (Mus. Comp. Zool. and Am. Ent. Soc). Four female specimens. 

 A fifth specimen is larger, and has the front distinctly coarctate anteriorly. 



