414 C. II. OSTEN SACKEN'S rRODROME 



16. Tabanus cymatophorus n. sp. 



Female. Face whilisli, with Avliite hairs on the cheeks ; palpi brown, densely clothed 

 Avith black hairs ; front grajish, with a yellowish tinge immediately above the antenna3, 

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

 above ; vertex graj- ; antenn;e reddish Inown, third joint dark brown towards the end. 

 Thoracic dorsmn grayish, with four broad blackish stripes sepai'ated by grayish lines; sides 

 of the dorsum gray, separated from the pleurte by a fringe of blackish hairs ; tnfts of 

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

 gle above the scutellnm, which is j^ellowish gray, with minnte white hairs ; pleurae and 

 pectus white, with white hairs. Knol) of halteres In-own, whitish at tip. First abdomi- 

 nal segment white, with brownish indistinct spots at the base ; segments two-four brown • 

 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 fdl 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 wliitish. Legs black, base of tibiae white, which color occupies 

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

 pairs. Wings subhyaline ; 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. 



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

 served specimen. 



Tills species is not unlike T. lielnwardt'd 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 with the lateral 

 ones by a broad white border, etc. 



17. Tabanus venustus n. sp. 



Female. Face j^ellowish white ; palpi brownish, clothed with minute Ijlack hairs ; front 

 grayish yellow above the antennre, grayish l^rown aljove the callosity, and with a j^air 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 In-own, with longi- 

 tudinal white lines ; scutellum clothed Avith Avhitish pollen. Abdomen broAvn, Avith AA'hite 

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

 fourth segments ; segments three-six, on each side of the triangle, sIioaa" a Avhite s^iot. Venter 

 brownish, Avith Avhitish pollen, which leaves a broad broAvn longitudinal stripe in the middle. 

 Feet broAvn. Wings variegated Avith broAvn, as folloAvs : the root hj^aline ; immediately 

 beyond the humeral crossvein 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 AA'ith the first ; the Avhole posterior margin 

 is bordered Avith pale broAvn, Avhich border, bemg continued around the apex to the anterior 



