440 C. R. OSTEN SACKEN'S PRODROME 



The synonymy of Macquart's T. qiiinqHeliiiealus I consider as certain. The description 

 of the venter is especially convincing ; (" ventre a, large bande noire longitudinale"). 



11. Tab anus tener n. sp. 



Female. Palpi pale reddish, clothed with whitish pollen and white and black hairs ; face 

 white, yellowish aronnd the antennae, with white hairs on the cheeks ; front grayish, Ijrown 

 in the middle, yellowish gray above the antennae ; frontal callosity reddish brown, a little 

 longer than broad, wdth a linear prolongation above ; prevailing color of the antennae black, 

 the vestiges of reddish on the first two joints are almost concealed under black hairs ; base 

 of the third joint more or less, sometimes hardly perceptibly, reddish ; upper angle of this 

 joint well-marked, but not very sharp. Thorax lilac-reddish, with the usual white lines 

 formed by a grayish pollen ; the pale reddish ground color of the pleura? is almost con- 

 cealed under a whitish pollen and white hairs ; a fringe of brown hairs from the humerus 

 backwards; a small tuft of blackish hairs in front of the scutcllum. Abdomen of the same 

 color as the thorax, which color is softened by a thin layer of whitish pollen ; the segments 

 have large but faint and easily rubbed off triangles in the middle, formed by a short white 

 pubescence on whitish ground ; lateral margins also whitish. Venter of the same color as 

 the abdomen, with the same thin covering of whitish pollen and Avhitish incisures. Front 

 legs dark brown, proximal half of the tibia? lighter brown ; four posterior legs reddish 

 brown, with whitish hairs. Wings subhj'aline ; very faint, almost oljsolete, brownish clouds 

 on the bifurcation of the third vein and at the base of the second posterior cell ; stigma 

 brown; first posterior cell not coarctate. Length, 17-18 mm. 



Hab. Geoi'gia (J. Ridings) ; Indian River, Florida (E. Palmer). Four females. 



This species is difficult to describe from the want of any well-marked charactei's. It is 

 distinguished l)y a peculiar soft reddish brown coloring, and the faintness of the white 

 abdominal triangles, which are very easily rubbed off. The comparatively small thorax 

 and somcAvhat narrow al.)domen make its shape appear more elongated than that of tlie 

 other speaies of the same group. The evanescent spots at the base of the bifurcation of 

 the third vein and of the second posterior cell will also fixcilitate its recognition. 



The eyes (softened on moist sand) showed two faint greenish crossbands, converging at 

 the outer end. For some time I thought that this might be T. gracilis Wied. ; but Wiede- 

 mann gives the size as five and two-thirds Rhenish lines, while it slionld be eight and one- 

 half in order to render the identification possible. 



12. Tabanus melanocerus. 



Tahaiius melaiiocenis Wioilemann, A\iss. Zw. I, p. 1-2, 10. 



? Tahanus exoist.uans Liniic, Syst. N;it., 11, p. lOOO, 8 ; DeGoer, VI, p. 2-29, 8 ; Tub., XXX, f. 5 ; Fabvieius, 

 Ent. Syst., IV, p. mb, 13 ; Syst. Aiitl, p. 90, 12. 



Female. Palpi whitish, clothed with minute black hairs ; face white, with white hairs ; 

 front l)rownish, mixed with gray ; frontal callosity reddish brown, sometimes dark brown, 

 longer than broad, with a linear prolongation above ; antenna? black, more or less reddish 

 at the basis of the third joint ; this joint is broad, its upper angle projecting. Thorax gray, 

 with whitish longitudinal lines ; (the color of the thoracic dorsum and scutellum in some- 

 what worn sjjecimens shows traces of reddish ; but in a very fresh and well-preserved spec- 



