OF THE TABANID.^ OF THE UNITED STATES. 447 



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

 incisures. Legs black, beset with whitish hairs ; tibia3 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 species a female, from a doubtful 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. nivosus, 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 by the prevalence of the whitish 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. aslutus and T. mlcrocephaliis of the group with pubescent eyes and small-headed males. 

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



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

 than to any other, proper allowance being made for the difference of sex. Nevertheless, 

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

 whom he quotes, described the same species. 



21. Tabanus longns n. pp. 



Female. Front moderately broad, brownish cinereous, with blackish hair ; callosity 

 square, black, rather convex ; above it, and connected with it, an indefinite, elongate, 

 blackish and somewhat shining spot ; antennae : 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, with white down ; palpi 

 rather stout, j'ellowish white, Avith small black hairs. Thorax grayish black, with very 

 faintly marked gray lines ; sides of the dorsum often reddish ; j^leuraj and pectus graj'ish 

 white. Al)domen rather long and comparatively narrow (the sixth segment longer than 

 in the allied species, but little shorter than the preceding one), grayish black, some- 

 times reddish on the sides, near the base ; on segments one to six on each side a row of 

 w^ell marked, oval, oblique, whitish spots, usually (but not always) not coalescent with the 

 whitish hind margins of the segments; in the middle of the abdomen a faint, whitish, lon- 

 gitudinal line, expanded at the incisrires, thus forming a series of faint triangles, with a 

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

 white hairs ; the sides are sometimes reddish. Legs reddish brown, clothed with a grayish 

 pollen ; tarsi brown, the basis of the four posterior tarsi paler. Wings grayish hj^aline ; 

 costal cell pale yellowish brown ; stigma pale brown ; first posterior cell broadly open. 

 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. 



