257 



while the greyish hind margins of the second and seventh segments 

 are not furnished with any pale hairs excepting on the extreme margins 

 and on the seventh segment there are numerous long black bristly 

 hairs ; pubescence on the sides somewhat longer and black but on the 

 two basal segments yellowish white. Ventre blackish brown and more 

 greyish, covered with ashy grey tomentum which becomes thinner 

 toward the anal apex, but the extreme hind margin of each segment 

 more or less distinctly dusted with ashy grey ; pubescence numerous 

 and depressed, pale yellowish white on brownish parts and white on 

 ashy grey parts especially on the hind margins, but on the seventh 

 segment there ere abundant erect long black bristly hairs and on the 

 two preceding segments some long sloping stout black pubescence. 



Length : 10.5-12 mm. 



This species is allied to Tabanus sexcinctus, Ricardo, but dis- 

 tinguished from that, by its less broader head with a very narrow 

 frontal stripe which has an elongated lower frontal callus, by much 

 browner thorax with less whitish legs of which the frontal femora bear 

 only black pubescence, and by pale yellowish pubescent abdominal 

 bands, which are conspicuous only on the third, fourth, and fifth seg- 

 ments, and these three are triangularly broadened in the middle ; and 

 also allied to Tabanus fulvicinclus, Ricardo, but easily distinguished by 

 the whitish bands on the abdomen which are not paler or reddish 

 brown about the base, by the colouring and comparative length of the 

 pubescence on the front legs, and by the form of the dorsal hump of 

 the antennae. 



In only one case I met, the female bit the cattle free in pasture 

 in early Summer, but it is now unknown, whether the fly bites human 

 beings or not. 



T. iyoensis may be rather common in Kiushu and Shikoku as 

 I have records from Sasayama, Futsukaichi, and Kumamoto, from July 

 to August 3Oth , but never found in the northern parts of Japan proper, 



