242 On a new Species o/Tabanus. 



inner ones on the hind margins of the segments ; those o£ 

 the median series are acute-angled, though their apices are 

 truncate and^ in the case of the median triangles on the 

 second and third segments, usually elongate ; the sides of 

 the median triangles on the second and third segments are 

 also more or less concave ; lateral margins of second and 

 following segments, which cut off the outer angles of the 

 outer series of triangles, drab-grey or buff; tergite of sixth 

 segment with more or less distinct traces of the three 

 triangles seen on preceding segments ; basal angles of tergite 

 of second segment drab-grey ; basal angles of tergite of first 

 segnaent, and lateral margins of this and of the five following 

 tergites, clothed with whitish hair ; all drab-grey triangles 

 clothed with minute, appressed, yellowish hairs ; intervening 

 dark brown or mummy-brown markings clothed with minute, 

 appressed, black hairs ; tergite of seventh segment clove- 

 brown (its sides and hind border buff), clothed with black 

 hairs, which at each lateral extremity are usually mixed 

 with yellowish hairs ; venter greyish salmon-coloured, when 

 viewed obliquely from behind usually with traces of a 

 narrow, dark, interrupted, median, longitudinal stripe, 

 ventral scute of penultimate segment mouse-grey, that of 

 terminal segment slate-grey, hind margins of ventral scutes 

 of second to sixth segments inclusive cream-coloured; ventral 

 scutes of second to sixth segments inclusive clothed with 

 appressed yellowish hairs, which in centre of ventral scute of 

 sixth segment are mixed with longer black hairs, a few 

 longer black hairs sometimes also present in centre of ventral 

 scute of fifth segment ; ventral scute of seventh (terminal) 

 segment clothed as usual with coarse, erect, black hairs. 

 Wings : veins dark brown ; stigma pale and inconspicuous, 

 usually faintly raw-umber-coloured. Squamce : alar pair of 

 same colour as wing-membi'ane, but more opaque, their 

 borders mouse-grey ; thoracic pair cream-buff, their borders 

 somewhat deeper in colour. Halteres : knobs yellowish 

 cream-coloured, more or less buff or orange-buft' towards 

 base, stalks buff or cream-buff. Legs : coxae grey, clothed 

 with white hair; femora and tibiae clothed with white or 

 silvery-white hair, except inner surfaces of front femora and 

 distal extremities of front tibia3, which are clothed with black 

 hair; tibiae buff or ochraceous-buff, distal extremities of 

 front pair, to a greater extent on inner than on outer surface, 

 dark brown, front pair also narrowly mouse-grey at extreme 

 base ; front tarsi clove-brown, second, third, and fourth 

 joints somewhat expanded ; middle tarsi dark brown ; hind 



