87 



facets on the larger upper part dilated and brownish black in death, 

 but on the smaller lower part small and purplish black, the dividing 

 line being not sharply defined and running across semicircularly so 

 that the small facets extend a long way up the back part. Antennae 

 shorter, with much longer black pubescence on the two basal joints ; 

 first joint much stouter, and very slightly longer than the second joint ; 

 third joint less stouter and much shorter. 



Thorax, abdomen, and legs as in the female, but with more 

 numerous black pubescence ; abdomen gradually narrowed towards the 

 apex. Wings with less conspicuous hyaline spaces than in the female, 

 the black colour extending down to the postical vein ; the anal and 

 axillary cell infuscate ; the apical hyaline space as in the female. 



Length : 9.5-10 mm. 



In the pasture or fields of the main Island of Japan this species 

 is common, from May to August, and attacks horses but rather rarely 

 cattle. It is noted that Chrysops japonicus may be a transmitter of 

 a certain epidemic plague of horses. I have records from Tonezawa 

 (May to August), Tokio (May to July), Kioto (June), Osaka (April to 

 June), and Iwate ; while it is known to occure in Amur. 



In June this species is one of bothers for rice-farmers, as the 

 female bites any parts of the body, through clothes. 



Subfam. TABANINAE 







Ocelli often absent or rudimentary, and sometimes even the 

 ocellar tubercle absolutely absent. Proboscis never porrect and 

 elongate. Eyes not pubescent or hairy, in life usually brilliant green, 

 but often banded (in Tabanus) or with curious zig-zag- shaped bands 

 (in Haetnatopotd) ; upper and anterior facets often enlarged in the 

 male. Frontal stripe varying from an absence of the callus to a 

 presence of two calli. 



Wings almost always not maculated In our soecies of the 



