species o/Tabanus. 241 



white hair, terminal joint cream-buflT, acuminate, moderately 

 swollen at base, thickly clothed on outer side with appressed, 

 glistening silvery-white hairs, usually mixed with some 

 minute black hairs ; first and second joints of antenn(B 

 greyish ochraceous-buff, clothed with glistening silvery- 

 white hairs (the upper distal angles clothed with minute 

 black hairs), expanded portion of third joint cinnamon- 

 rufous or ochraceous-rufous, often more or less brownish 

 or dark brown towards distal extremity, relatively short, 

 annulate portion of third joint clove-brown, relatively long. 

 Thorax: dorsum dark brown (in rubbed specimens appearing 

 more or less slate-grey), marked with five light-grey, partly 

 yellowish-, partly whitish-haired longitudinal stripes ; ante- 

 rior and lateral borders of dorsum also grey; outer surface 

 of each postalar callus, and a narrow area immediately in 

 front of this above base of wing, clothed with white hair j 

 median dorsal grey stripe very narrow, starting on front 

 margin but terminating before reaching prescutcllar groove ; 

 admedian dorsal grey stripes broad and entire, starting on 

 front margin and meeting at tip of scutellum, which their 

 distal extremities encircle; lateral grey stripe on each side 

 short, extending only from outer extremity of transverse 

 sutui'c to postalar callus ; dark stripes between grey stripes 

 clothed with blackish hair ; distal extremity of scutellum 

 cinnamon-rufous or ferruginous ; swelling in depression 

 at each end of transverse suture drab-grey ; pleurae and 

 pectus light grey, clothed with whitish hair, upper portion 

 of mesopleurse drab-grey, clothed jjartly with whitish, partly 

 with blackish or black hair. Abdomen-, tergite of first 

 segment with a large drab grey patch on each side, and on 

 hind margin in middle line with a small, somewhat triangular 

 or transversely elongate spot, similarly coloured and clothed 

 with yellowish hair ; in the centre of the segment is a dark 

 brown blotch (somewhat greyish in front, where it projects 

 from beneath the scutellum) extending to the hind margin j 

 the distal edge of this blotch is indented by the median 

 light spot or triangle already described, and its sides are 

 concave ; each of the lateral drab-giey patches bears an 

 oblique streak or patch of minute black hairs, extending 

 outwards towards the posterior angle ; tergites of second to 

 fifth segments inclusive each bearing three large drab-grey 

 triangles, arranged in a transverse row (thus forming also 

 three longitudinal series), resting on the hind margin, where 

 they are usually though not always connected, and extending 

 to the front margin ; the outer triangles are right-angled or 

 obtuse-angled, the right angles or obtuse angles being the 



