Pselaphidce of Japan. 827 



Extremely similar to B. japonicus, but witb different 

 male characters, and the thorax more coarsely punctate. 

 In the male the basal joint of the antennae is enlarged, 

 so that it is broader and longer than it is in the same 

 sex of B. japonicus, whereas the 2nd joint remains 

 simple, being thus more slender than the 1st, instead of 

 dilated, globose, and broader than the 1st, as is the case 

 in B.japonicus ; the hind legs are much more incrassate 

 than in any individual I have seen of B. ja/ponicus. 

 The antennae much resemble those of the female of B. 

 japonicus, but the basal joint is larger and thicker, and 

 the incrassate hind legs readily distinguish the male B. 

 affinis from the female B.japonicus. The females of the 

 two species are probably excessively similar. 



A single male individual was found at Nagasaki, Gth 

 April, 1881. . 



Bythinus japonicus, Sharp. 



Sharp, Trans. Ent. Soc. Loncl., 1874, p. 125. 



A small series of about a dozen individuals was found 

 about Nagasaki in March and April ; and a single 

 specimen at Miyanoshita. As is frequently the case 

 with the European species of Bythinus, most of the 

 individuals are females. The incrassation of the male 

 hind legs is not very considerable in any of the few 

 males found by Mr. Lewis. 



Bythinus subseriatus, Weise. 

 Weise, Deutsche Ent. Zeit., 1877, p. 98. 

 Oshiroyama, Hagi (Hitter). 

 This species has not been found by Mr. Lewis. 



Bythinus reversus, n. s. 



Major, testaceus, longius pubescens ; vertice pro- 

 thoraceque crebre sat fortiter, elytris parcissime obsolete, 

 punctatis ; palpis maxillaribus articulo ultimo, elongato, 

 fere gracili. Long, vix 2 mm. 



Although only two female individuals in an immature 

 condition have been found, this species appears to be a 

 very distinct one. It has the maxillary palpi formed 

 nearly as in B. curtisi, from which species it is very 

 different by its much larger size and different punctua- 

 tion. The antennae have an elongate basal joint, about 



