water-beetles of Japan. 453 



of the apex of the mesosternal process. It is very 

 similar to Hydrophikis cinctus, Say, from which it differs 

 by the falcate mesosternal process, as well as other 

 structural characters. It is pretty certainly the species 

 recorded by Harold {loc. supra cit.) as being P. cinctus, 

 Say, and this latter name must therefore be erased from 

 the list of Japanese Coleoptera. 



Sendai, Oct. 20th, 1880, four examples ; Osaka, July 

 6th, one example. 



I have dedicated the species to Baron Edgar von 

 Harold, to whom Science is deeply indebted for his 

 contributions to the knowledge of the coprophagous 

 lamellicorn, and other, Coleoptera. 



Philydrus subsignatus. 



Phiiydrus subsignatus, Harold, Deutsche Ent. Zeit., 

 1877, p. 342. 



This insect has not been met with by Mr. Lewis. It 

 was found by Donitz in the lake at Hakone. 



Philydrus uniformis. 

 Ovalis, sat convexus, nitidus, uiger, antennis palpis, tborace, 

 elytris, tibiis, tarsis capitisque macula utrinque testaceis ; crebre 

 fortiter, punctatus ; mesosterni lamina magna. Long. 4 mm. 



This little insect, with the upper surface coloured as 

 in Hydrophilus bicolor, Payk., is much smaller. The 

 extremities of the maxillary palpi are suffused with 

 fuscous-colour ; the punctuation of the elytra is not 

 dense, and larger serial punctures are not to be observed. 

 The large mesosternal lamina has its lower edge free 

 from serration or inequalities, but has a very minute 

 acumen at its anterior angle. 



Yokohama, February, 1880. 



Philydrus vilis. 



Ovalis, sat convexns, nitidus, niger, antennis, palpis, tibiis 

 tarsisque testaceis, anteunarum clava infuscata, capita nigro 

 macula utrinque testacea, tlioiace elytrisque fusco-ferrugineis, 

 versus latera dilutioribus ; crebre fortiter punctatus ; mesosterni 

 lamina parva. Long. 4 mm. 



