apical bdnd of the wings, by its entire stripes on the thorax, and by 

 many minor characteristics. Prof. Dr. C. Kertesz placed, in his Catst- 

 logtis Dipterorum Vol. Ill, this species as a. synonym of pulvialis, 

 and in this he was followed by our students, but we find that Iristis 

 can be fairly well distinguished from three European specimen of 

 Pulvialis I possess if it is carefully compared with them. 



H. tristis Bigot is far too common all over the northern parts 

 of Japan, as the bite of the female is very annoying and, to many 

 people, very painful and persistent. In my own case its bite always 

 lasts five or six days on the actual day of the bite I feel merely a 

 sharp needle prick, and then I do not feel the slightest further effect 

 until the following day when a very slight irritation can be noticed at 

 the spot of the bite, and at night, the spot becomes irritable. On the 

 third day, it swells up and becomes troublesome. On the fourth day it 

 reaches its maximum in size and irritability, then on the following day 

 it suddenly diminishes but at night I often feel similar irritability, 

 though slighter, after that it gradually diminishes, and at last no fur- 

 ther effects are felt, although the punctured spot remains on the follow- 

 ing three or four days. It is noticed that the female may be a 

 transmitter of a certain infecti6us disease of horses in northern Japan. 



These flies usually occur from about the 2Oth of May to September, 

 but generally it does not appear in August, except in Hokkaido. I never met 

 these biting flies in rooms even when the house was built in a field 

 or on high land, entirely isolated at a distance from a town or village, 

 or closely connected with pasture. 



2. Haematopota sakhalinensis, Shir. (n. sp.) (PI. II, fig. 8.) 



(Karafiito-Gomafu-Ahu.) 



Very small species with entire black thorax, and with rather 

 pale greyish brown wings which are market almost all with incomplete 

 ocelli. 



Male. Head apparently broader than the droadest part of the 



