429 



Abdomen narrow and long but broader than the thorax and 

 gradually narrowed to a rather rounded apex ; brownish black unicolor- 

 ous, slightly covered with a greyish tomenturn and clothed with a 

 close-lying short black pubescence, and at the sides there are longer 

 black hairs which on the basal three segments are whitish, these pale 

 hairs somewhat extending behind to the fourth segment ; underside- 

 more blackish but obscured by a greyish tomentum, with the very 

 narrow whitish haired segmentations which do not appear on the first, 

 sixth and seventh segments, the pubescence on the rest black as that 

 on the dorsum. 



Length : 16 mm. 



I described above from only a single specimen from Kosempo, 

 which has been compared with the type in the British Museum. 



This species is very uncommon in Formosa as it is only recorded 

 from Fuhosho (July) and Kosempo (July), and it is unknown if the 

 female has a biting habit. This species also is known to occur in the 

 Federate Malay States. 



7. perakiensis is easily distinguished from all the other of our 

 Tabanus fauna, by its slender form, its infumated wings, its unicolorous 

 brownish black abdomen, and its blackish brown thorax without stripes,, 

 while it is allied to T. inobservatus, Ricardo, from Sumatra but <juite 

 different, as Miss Ricardo pointed out in her Revision. 



36. Tabanus formosiensis, Ricardo. (pi. VIII, fig. 6 ; 

 pl. XI, fig. 17). 

 (Ki-ashi-Chibi-Abu) 



Rec. Ind. Mas., IV, p. 220. 1911; Ann. Hist.-Nat. Mus. Nat. Hung., 



XI, p. 172, 1913. 



A small blackish gr-ey species with a small cylindrical frontal 

 callus having a very narrow and very long linear extension on the 

 narrow frontal stripe, with the antennae and legs pale yellow, with the 

 quite clear wings, and with the abdomen tinged with some olive-grey. 



