265 



distinct triangles on the dorsal abdomen, and by the reddish yellow 

 pubescence at the middle of the posterior margin of the first segment 

 of the dorsal abdomen. 



The denuded specimens well agree with Coquillett's very short 

 description of T. Immilis, and in my large collection of Japanese Ta- 

 banidae and in Prof. Matsumura's materials there is no other species 

 which may be identified by any entomologists as this species ; I am 

 therefore inclined to make an adventure and describe this species 

 as it. 



This fly is not uncommon in the northern parts of Honshu and 

 in the mountainous districts of South Japan, and its occurence is 

 abundant in August, and gradually diminishes towards October, and 

 after this season the .fly disappears all over the districts. It is known 

 that the female bites pasturing horses or cattle, or sometimes attacks 

 them when tied up or in a shed and it is probably one of the trans- 

 mitters of a certain infectious anoemia of horses. The female occasionally 

 pierces the human face near neck, with her stout proboscis, and 

 sometimes on the back through summer clothes. 



12. Tabanus aurotestaceus, Walker. 



List Dipt. V, suppl. I, pp. 214 & 253, 1854. 



V. d. YYulp, Cat. Dipt. South Asia, p. 60, 1896. 



Kertesz, Cat. Dipt., Ill, p. 226, 1908. 



Ricardo, Rec. Ind. Mus., IV, p. 163, 1911; Ann. Mus. Nat. Hung., 

 XI, p. 168, 1913. 



A yellowish medium-sized species is distinguished by a broad 

 yellow median stripe on the abdomen, by a long very narrow greenish 

 yellow frontal callus on the very narrow frontal stripe, by yellowish 

 legs and clear wings, and by yellowish brown thorax and scutellum. 



