272 



die and side stripes usually brown, and the outer side of the latter 

 also brown, but the extreme sides of the segments greyish reddish 

 yellow ; pubescence on the surface short and depressed, black, which 

 on the stripes is yellowish and on the side-margins whitish and longer, 

 but on the middle stripe yellowish pubescence intermixed with abund- 

 ant black hairs similar to those on the rest of the disc ; the seventh 

 segment blackish throughout, without any stripes, and densely covered 

 with longer black bristly hairs. Ventre light reddish yellow and more 

 obscured by ashy grey tomentum, but the posterior part more or 

 less darkened especially on the last two segments, covered with fine 

 silvery white pubescence which is conspicuously intermixed with slight- 

 ly longer black hairs on the broad median part throughout the whole 

 length ; seventh segment only long and erect but curved black 

 bristles, and the preceding segment bearing some long sloping black 

 bristly hairs. 



Length : 15-17 rnm. 



In five specimens from Formosa it varies a little in the median 

 stripe as described above, and in the colour of the abdomen both dor- 

 sally and ventrally, as one material is much more darker, and the 

 other one is more conspicuously reddish yellow. It is easily distin- 

 guished from our horse- flies by three continuous stripes on the greyish 

 red-yellow abdomen, but is rather closely allied to Tabanus albirnedius, 

 Walker, from India, and special attention must be given to the narrow 

 frontal stripe of the female, more slender palpi covered with black 

 pubescence, darker legs, reddish yellow abdomen, and broader basal 

 annulation of the third antennal joint. 



The male * of this species may be Atylotns conicus, Bigot, accord- 

 ing to the Ricai'do's identification, but I cannot discuss it further as I 

 have no male specimens. 



The occurence of this Tabanus is probably restricted to the 

 southern parts of Formosa, as I have a record from Takao only (June). 

 In Formosa, in June the female bites horses and cattle, as well as 



