brownish-black, until scarcely a trace of the markings remains. 



In front of the eyes project conspicuously the three-jointed 

 antennae, and below the head in all the Japanese forms, except the 

 Corizoneura yezonensis (n. sp.), depends vertically the fleshy proboscis, 

 which encloses the piercing mouth parts. The palpi, which lie one on 

 each side of the proboscis, are swollen and fleshy, and differ in shape 

 according to sex. 



The body is clothed with short hair, and totally devoid ot the 

 large bristles known as macrochaetae. In the colouration as in the 

 shape of the body horse-flies throughout the world show remarkably 

 little variation, and the Japanese species are consequently very similar 

 in appearance to many of those belonging to the same genera found 

 in Europe, India and elsewhere. Some shade of brown or black is 

 the most frequent hue, though the abdomen is often lighter or exhibits 

 lighter markings. The wings, which, when the insect is at rest, diverge 

 at the tips or are somewhat tectiform, have in the case of Chrysops 

 and Haeuiatopota characteristic markings. 



Horse-flies may be met with throughout the summer in fields, 

 open spaces in woods, by country roadsides, or sometimes in open 

 rooms of Japanese houses. The edges of woods are the favourite 

 haunts of certain species, and when resting in such a place on a hot 

 day, one may frequently notic a Haeuiatopota or two or a specimen 

 of one of the smaller species of Tabanus, crawling with much delib- 

 eration over one's coat and making preliminary investigations with its 

 proboscis ; the outdoors of farmers' houses which are isolated in the 

 fields are also a good place for finding all our species of the genus 

 ■Chrysops, as their females, one or two sometimes more, very often 

 alight on the back of one enjoying the evening breeze. The males 

 do not suck blood, and certain species of them may occasionally be 

 met with on flowers or sometimes hovering in the air. The species of 

 Chrysops and Haeuiatopota, and the smaller species of Taoanus are 

 .remarkable for the quietness which they alight on their victims, the 



