446 C. R. OSTEN SACKEN'S PRODROME 



down ; palpi ratlier stout at the Ijase of the second joint, j-ellowish white, beset with black- 

 ish hairs at the tip. Antennre : first joint reddish yellow, with a tuft of black hair on the 

 upper end; third joint lilack, j-ellowish at the extreme base onlj- ; excision shallow, and 

 hence, ujjper angle but little projecting; basal portion rather broad; annulate portion 

 short, stout. Thoracic dorsum dark brown, with faint whitish longitudinal lines ; the sides, 

 including the humeri, reddish ; beset with sparse golden yellow and whitish hairs ; scutel- 

 lum dark brown, beset with the same hairs. Plein-a; yellowish, with long, soft, white hairs. 

 Abdomen whitish pollinose, beset with a short, white pubescence ; in the middle of each 

 segment a bilolied (or truncate obcordate) brownish black spot, the largest on the second 

 segment, and diminishing in size on each successive segment ; the sides of the segments 

 (except the first) are brownish, this brown border gaining in breadth towards the end of 

 the abdomen. In badl}' preserved specimens the reddish ground color of the white poi-- 

 tions of the abdomen appears. Venter grayish. Front legs brown, except the proximal 

 two thirds of the til)i;e, which are whitish j-ellow ; four posterior legs reddish yellow ; femora 

 and tips of tarsal joints Ijrownish ; tips of til)ia3 very slightly infuscated ; all the coxa) and 

 femora clothed with soft hairs ; tibia3 with short, whitish pile ; the hind tilji;e have a fringe 

 of liair, which, in a certain light, appears wliitish. Wings almost hyaline ; stigma pale 

 l)ro\vn ; the bifurcation and some of the crossveins have brown shadows, visible under the 

 magnilying glass only ; first posterior cell not attenuated. 



Male. The white coloring of the abdomen, interrupted only by the middle row of l)i- 

 lobed blackish spots, is veiy striking in ray only specimen ; the face, and the hairs upon it, 

 are brownish gray (not white, as in the female) ; the legs are somewhat darkei-; the white 

 lines on the thorax are not visible. Head larger than that of the female, although not 

 sul (hemispherical ; on the eyes there is a yellowish border above the line of separation, 

 between the larger and the smaller facets. Length about lo mm. 



Hah. New Jersej^ ; one male and two females (commimicated liy the American Ento- 

 mological Society). 



The coloi-ing of the eyes (revived by moisture) in the female proved to be green, with a 

 faint vestige of a single purple crossband. 



20. Tabanus vivax n. sp. 



(?) 2\ihanus nmnjinalis Wit'cleiiiniin, Aiiss. Zw., I, p. IGO, 84. 



Male. Face gray, with wliitish hairs below, and blackish ones on the sides ; second joint 

 of palpi reddish, with a gray pollen and with whitish and blackish hairs ; frontal triangle 

 (above the antennae) gray, black or brown at the tip ; antenna? : basal joints reddish yellow, 

 with Ijlack hairs, third joint black, reddish j^ellow at the extreme base only, elongate, 

 of moderate breadth, luit little excised above, the upper angle moderately jirojecting. 

 Thorax grayish Idack, with white longitudinal lines, a1)ljreviated jiosteriorly ; pleura) and 

 pectus grayish, clothed with long whitish hairs. Abdomen black ; on the first segment a 

 small white spot under the scutellum ; on each of the following segments a triangular white 

 spot on the hind margin, and an oljlique lateral white spot on each side, angular in shape 

 (owing to its being prolonged along the hind margin) ; on the second segment these lateral 

 spots are distinctly larger than the triangle in the middle ; they become smaller on the 



