323 



A series of this species from Tamsui (Formosa), collected by 

 Mr. K. Okada, in I9-.II, have been described by the author as 7". 

 okadae, in the Tokubetsu-Hokoku, Agr. Exp. Stat., Taihoku, Formosa, 

 VIII, p. 285, 19 1 3, but on later study, he found that all the materials 

 were very nicely denuded and that it no doubt belongs to the smallest 

 form of T. amaenus. 



T. amaenus is not uncommon throughout Formosa, except 

 at the southern extremity, and also I have records from many parts of 

 Japan from July 5th to September 3rd. In Hokkaido I took this 

 species at Sapporo and Ono, both in August, and in other countries it 

 has been recorded from Chinese Mongolia, Shanghai, Foo Chow, 

 Swatow, and Hongkong. 



The females are rather familiar to our cattle especially in Formosa, 

 where even baffaloes are very often attacked by a small swarm of them, at 

 that time we can easily collect this species as it probably does not like 

 to draw out its piercing stylet from the skin of the host during the 

 feeding. In Japan it is also noticed that the female bites horses or 

 cattle, but it may be less abundant that' T. mandarinus. I have no 

 record, that this fly bites men, from either Japan or Formosa, but it 

 may do so. 



The male insect has been frequently taken by collectors in un- 

 cultivated fields in the afternoon or sometimes morning, while the 

 female fly is usually found on the pastures near villages or towns 

 generally in the day time from April to September in Formosa, but 

 from July to the beginning of September in Japan. 



20. Tabanns takasagoensis, Shir. (n. sp.) (PI. VII, 

 fig. 2 ; PL XI, figs. 7 & 8). 



(Gi-Sliirofn-Ahn). 



A brownish medium-sized (but rather small) species with the 

 broad frontal stripe, on which a frontal callus is rather stout and yel- 



