u 



three posterior segments being blackish but the first one at the places 

 between the black stripes somewhat faded ; pubescence mostly blackish, 

 su'berect, at the yellow portions and posterior margins of* the segments 

 with short rather dense somewhat depressed and yellowish hairs inter- 

 mixed, and at the sides of two or three basal segments mingled 

 with suberect, somewhat tawny, and yellowish hairs. Belly in the 

 specimens from Japan bearing a conspicuous broad blackish (but faded 

 by yellow tomentum) median band, which is less interrupted at the 

 segmentations, three posterior segments entirely black but the first 

 two slightly obscured by yellowish dust and the last one moderatly 

 shining ; in the species from Formosa orange yellow with brownish 

 sixth segment and black seventh ; pubescence mainly yellowish, very 

 short, almost depressed, but at the median parts of the segments with 

 a few long brownish hairs, in Japanese species usually blackish, much 

 longer, and especially on the second segment bearing very few very 

 long tawny hairs. 



Length : about 9 mm. 



I have one incomplete specimen of the ma!e, collected by the 

 late Mr. I. Nitobe at Koshun, in South Formosa. This is much paler 

 than others, having very inconspicuous abdominal stripes, but the wings 

 are much more smoky, and the cross-band has a zig-zag-like outer 

 margin. 



This species is easily distinguished from the other species of 

 Chrysops by its four narrow black abdominal stripes. 



The handsome Chrysops seems to be rather common in the 

 Main Island of Japan, but is never found in the northern Islands, 

 Hokkaido or Sakhalin. I have no specimens from the Okinawa Islands, 

 but it is probably common there, because even in Formosa it is not 

 uncommon, distributing from the northern part to the southern ex- 

 tremity. In Japan, females very often annoy horses by their persistent 

 attacks, and it is usually believed that they are a transmitter of infectious 

 anoemia of horses in Japan; in Formosa they usually bite the back or 



