311 



yellowish grey or pale reddish yellow portion of the tibiae especially 

 on the front pairs hardly whitish about the basal third ; pubescence 

 denser and longer, with much more black one intermixed. 



Abdomen less flatter than in the female, conical, about as long 

 as or apparently shorter or very seldom slightly longer than the head 

 and thorax (including the scutellum) together, coloured and marked as 



in the female but sometimes more brownish about the sides of the 



' i 

 basal segments, and lateral grey spots on the second segment being 



much larger and conspicuous ; the underside less greyish with rather 

 much darker median part. 



Length : 17-20 mm. 



This species varies a little in both sexes, in the colouring of 

 the antennae and in the amount of the black pubescence on the legs, 

 as well as in the male, in the colouring of the front tibiae. It is easily 

 distinguished from Tabanus ainaemis, Walker, by the well-defined and 

 large ashy grey median triangles and only two or three pairs of the 

 greyish lateral triangles on the abdomen, and by its rather smaller size, 

 as well as in the male the absence of reddish colouring of the sides 

 of the basal abdominal segments. We have no other allied species in 

 Japan. 



T. incmdarinus is not an uncommon Japanes species, as 1 have 

 records from Hokkaido, Honshu (from the northern to the southern 

 extremities), Shikoku, Kiushu, snd Formosa (throughout the Island) ; 

 and my dates are mainly from July 4th to August 2ist in Japan 

 and Formosa, but I believe I have a record as early as April I2th in 

 Formosa, and record as lat^ as September 28th in Japan. It is re- 

 corded from practically all the coast of China, including Hongkong. 



The female flies bite horses or cattle, free in somewhat high 

 meadow pastures, or in sometimes rather plain pastures, and it is pro- 

 bably an extensive transmitter of a certain infectious anoemia of horses 

 in Japan. It sometimes attacks men working in the fields, but it seems 

 they feel only the slightest pain. 



