446 C. R. OSTEX SACKEN'S PRODROME 



down ; palpi rather stout at the base of the second joint, yellowish white, beset with black- 

 ish hairs at the tip. Antenna3 : first joint reddish 3'ellow, with a tuft of black hair on the 

 upper end ; third joint black, yellowish at the extreme base only ; excision shallow, and 

 hence, uj^pcr angle but little projecting ; basal portion rather Ijroad ; 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. Pleura3 yellowish, with long, soft, white hairs. 

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

 segment a bilobeil (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 badly preserved specimens the reddish ground color of the white por- 

 tions of the abdomen aj^pears. Venter grayish. Front legs brown, except the proximal 

 two thirds of the tibiae, which are whitish yellow ; four posterior legs reddish yellow ; femora 

 and tips of tarsal joints brownish ; tips of tibiae very slightly infuscated ; all the coxae and 

 femora clothed with soft hairs; tibise with short, whitish pile ; the hind tibiaj have a fringe 

 of hair, which, in a certain light, appears whitish. Wings almost hyaline ; stigma pale 

 brown ; the bifurcation and some of the crossveins have brown shadows, visible under the 

 magnifying glass only ; first j)Osterior cell not attenuated. 



Male. The white coloring of the abdomen, interrupted only by the middle row of bi- 

 lobed blackish spots, is very striking in my only sj^ccimen ; the flice, and the hairs upon it, 

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

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

 subhemispherical ; on the eyes there is a yellowish border above the line of separation, 

 between the larger and the smaller facets. Length about 13 mm. 



Hah. NewJerse}^; one male and two females (communicated by the American Ento- 

 mological Society). 



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

 faint vestige of a single pur|)le crossband. 



20. Tabanus vivax 11. sp. 

 Tabanus marginalis Wiedemnnn, Auss. Z\v., I, p. IGG, 84. 



Male. Face graj^, with whitish 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 ; antennte : basal joints reddish yellow, 

 with l>lack hairs, third joint black, reddish j-ellow at the extreme base only, elongate, 

 of moderate breadth, but little excised above, the upper angle moderately projecting. 

 Thorax grayish black, with white longitvidinal lines, abbreviated posteriori}' ; pleura; and 

 pectus gra^dsh, 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 oblique lateral white spot on each side, angular in slia^De 

 (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 



