316 Mr. D. Sharp's revision of the 



The species of this group apparently form a well- 

 marked genus, which may probably, however, be con- 

 nected with Batrisus by species unknown to me, so that 

 I do not give it a name. The only species I know 

 belonging to it in addition to the Japanese forms are 

 two from Siam. The male characters in B. optatus, and 

 even in B. modestus, are of a most remarkable character ; 

 and in B. pedator we find, on the hind femora of the 

 male, a peculiarity of structure which, as regards its 

 function, is probably the same as the peculiar structure 

 of the antennae of B. antennatus and the front tibiae of 

 B. modestus. Like the other Batrisi, the species are 

 probably submyrmecophilous in their habits ; two of 

 them were found in company with Diartiger. 



Batrisus dissimilis, Sharp. 



Sharp, Trans. Ent. Soc. Lond., 1874, p. 116. 



Two other individuals have been found of this species, 

 and as, like the former specimens, they possess no 

 peculiar sexual marks, I am inclined to think they are 

 all females, and that the male is still unknown. 



Miyanoshita, May, 1880 ; Kobe, 12th July, 1881. 



Batrisus puncticollis, n. s. 



Brunneo-castaneus, evidenter pubescens ; gracilis, 

 antennis sat elongatis ; capite thoraceque fortiter punc- 

 tatis, hoc parte basali angusto haud brevi, dorso canali- 

 cular, lateribus utrinque longitudinaliter impressis ; 

 elytris parum punctatis, stria discoidali elongata ; abdo- 

 minis segmento primo dorsali in medio utrinque plicula 

 arguta sat elongata. Long. 2 mm. 



Second joint of antennae about as long as the 3rd and 

 4th together. Head very densely punctate, without trans- 

 verse impression ; vertex obscurely bifoveolate. Thorax 

 coarsely punctured, but not so densely as the head. 

 Elytra quite indistinctly punctate. The 1st dorsal seg- 

 ment very elongate, and with the two fine raised lines or 

 plicae more distinct and elongate than usual. 



Although the male of this species has not been found, 

 yet the female is so certainly distinct that I have no 

 hesitation in naming it. On account of the coarsely- 

 punctured thorax, it can only be confounded with B. 

 modestus and B. dissimilis ; it is larger than the former, 



