91 



pair with two unequal spurs ; front tibiae and tarsi with touch-hairs 

 beneath in both sexes. 



Abdomen about as wide as the thorax but about twice as long 

 as that, almost parallel-sided and rather flat, greyish black or greyish 

 dark brown in the Japanese species, and often with grey spots, flecks, 

 or a dorsal stripe, or even (in the male) with light ferruginous lateral 

 markings near base. Genitalia sometimes conspicuous. 



This genus is easily distinguished by its peculiarly mottled 

 wings, its comparatively simple antennae, and its comparatively small 

 size, but the species are exceedingly difficult to separate. In the species, 

 from Japan, Sakhalin and Formosa, all belong to Ricardo's Division 

 IV and they are easily distinguished from each other by the length 

 of the first antennal joint, and the pale marking of the wings. 



The described species in the world now amount to more than 

 150, in which about 64 per cent occur in Africa, about 28 per cent in 

 Asia, about 5 per cent in Europe, and only about three per cent in 

 America ; in Australia there is no species of this genus. 



In Japan the flies are common on the country road, and are 

 always found when we travel on horse back. The females are most 

 perisistent blood-suckers of both man and beast, especially on hot days, 

 and the males are commonly found resting on timber or rocks, or 

 towards evening on flowers. 



At the present time Haematopota is represented by only three 

 cognized species in Japan, including both Formosa and Sakhalin, though 

 there is another species described by Bigot (rufipennis) which is not 

 known to me. 



Key for Species. 



I. Hind femora almost unicolorus. 



2. First joint of antennae distinctly shorter than the third joint. 



3. Thorax greyish black with distinct whitish stripes 



tristis, Bigot. 



