iQii-l G. RiCARDO : Revision of the species of Tabanus. 191 



Tabanus explicatus, 9 , Walker. 



List Dipt.,v. p. 328 (1854). 



Types, two females from Sikhim, E. Himalayas (Hooker) ; 

 another female from Kliasi Hills (Chennell coll.) ; two females from 

 Coonoor, Central India. One male from Kliasi Hills (Chennell coll.). 



A black species with narrow fulvous segmentations on the 

 abdomen, 3-ellowish white tibiae and hyaline wings with yellow veins 

 and stigma. Length 21 mm. 



Face covered with greyish yellow tomentum and a few white 

 hairs. Beard pale yellowish. Palpi reddish with thick black 

 pubescence, almost the same width throughout, the apices obtuse. 

 Antennae reddish, the third joint dusky, broad at base with a 

 prominent tooth, the first two joints with black pubescence. 



Forehead and subcallus same colour as face, the former nearly 

 seven times as long as it is broad and a third narrower anteriorly, 

 the frontal callus blackish brown, shining, oblong, not reaching 

 the eyes with a rather thick lineal extension. Thorax with some 

 grey tomentum, reddish at sides, hairs on sides yellowish. Abdo- 

 men blackish with narrow reddish segmentations on every segment, 

 which in fresh specimens are covered with whitish hairs, often 

 extending in the middle to almost a triangular spot, dorsum other- 

 wise appears devoid of pubescence ; under side similar. Legs black, 

 tibiae pale yellowish, black at apices, fore coxae densely covered with 

 yellowish grey tomentum, femora and tibiae with white, apices of 

 tibiae and tarsi with black pubescence. Wings very slightly tinged 

 yellow on second and third longitudinal veins. The specimens from 

 Coonoor probably discoloured have more reddish brown colourmg 

 on the abdomen which has yellowish pubescence. The male is 

 identical with the female, the large facets occupy two-thirds of the 

 eye, the small facets extending as a narrow border to the vertex. 



Tabanus nicobarensis, 9 , Schiner. 



Reise Novara Dipt., p. 81 (i86b). 



Black : thorax with some grey tomentum and with three paler 

 stripes, only distinct in certain lights and then especially so anter- 

 iorlv, sides also paler, the shoulders with white tomentum ; breast 

 sides and scutellum ashy grey ; the short pubescence on the dorsum 

 of thorax chiefly black or at least dark, but whitish on the sides of 

 breast, with a black-haired stripe from the base of wings to the 

 shoulders. Abdomen black-brown, the first segment whitish at 

 the sides, all segmentations clothed with snow-white short hairs 

 which are extended in the middle to small, blunt, triangular 

 spots ; under sides identical ; viewed from behind towards the light 

 a dark cinnamon-brown tomentum spreads over the whole abdomen 

 which, in comparison with the thorax viewed in the same light and 

 appearing very light grey, stands out in strong contrast. Head 

 black, with whitish tomentum and shining white pubescence ; the 



