444 C. R. OSTEN SACKEN'S PRODROME 



16. Tab anus cymatophorus n. sp. 



Female. Face whitisli, with white hairs on the cheeks ; palpi bro-wn, densely clothed 

 with black hairs ; front grayish, with a yellowish tinge immediately above the antennas, 

 and a brownish one above the callosity ; the latter suboval, dark brown, prolonged in a line 

 above ; vertex gray ; antennae reddish brown, third joint dark brown towards the end. 

 Thoracic dorsum grayish, with four broad blackish stripes separated by grayish lines; sides 

 of the dorsum gray, separated from the pleurse by a fringe of blackish hairs ; tufts of 

 longer white hairs between the root of the wings and the scutellum ; a small brown trian- 

 gle above the scutellum, which is yellowish gray, with minute white hairs ; pleurae and 

 pectus white, with white hairs. Knob of halteres brown, whitish at tip. First abdomi- 

 nal segment white, with brownish indistinct spots at the base ; segments two-four bro%vn 

 at base, which color expands into triangles on each side and into two diverging lobes 

 in the middle ; the posterior half of these segments is white, expanding into triangles, 

 which fill out the intervals between the brown color ; segments five and six show the 

 same markings, only less distinctly. Venter brownish, on each side thinly clothed with 

 whitish pollen, which thus leaves a broad brownish longitudinal stripe in the middle ; 

 hind margins of segments whitish. Legs black, base of tibia? white, which color occupies 

 more than half of the tibia on the intermediate pair, and less than half on the two other 

 pairs. Wings snbhyaliue ; dark brown clouds on crossveins, at the base of all posterior 

 cells, and on the bifurcation of third vein ; stigma yellowish brown, rather pale ; first pos- 

 terior cell coarctate at its distal end. Length, 20 mm. 



Hob. Kentucky, near Mammoth Cave (F. G. Sanborn). A single, but very well pre- 

 served specimen. 



This species is not unlike T. Reinwardlii Wied. in its general appearance and coloring, 

 but is much larger, the palpi are darker, the frontal callosity more elongated, the coloring 

 of the legs altogether different, the white design on the abdomen much better defined, 

 especially the middle triangles, which are larger, and connected posteriorly wdth the lateral 

 ones by a broad white border, etc. 



17. Tabanus venustus n. sp. 



Female. Face yellowish white ; palpi brownish, clothed with minute black hairs ; front 

 grayish yellow a1:)ove the antenna?, grayish brown above the callosity, and with a pair of 

 dark brown spots in the middle ; callosity brown, not occupying the whole breadth of the 

 front, its linear prolongation not distinctly connected with it. Thorax brown, with longi- 

 tudinal white lines ; scutellum clothed with whitish pollen. Abdomen brown, with white 

 triangles in the middle of the segments ; they are especially large on the second, third and 

 fourth segments ; segments three-six, on each side of the triangle, show a white spot. Venter 

 brownish, with whitish pollen, which leaves a broad brown longitudinal stripe in the middle. 

 Feet brown. Wings variegated with brown, as follows : the root hyaline ; immediately 

 beyond the humeral crossvcin a broad brown crossband, reaching the posterior margin ; 

 another narrower and shorter crossband covering the crossveins at the base of the marginal, 

 first posterior and discal cells, is almost confluent with the first ; the whole posterior margin 

 is bordered with pale brown, which border, being continued around the apex to the anterior 



