452 Mr. David Sharp on the 



punctures, which on the posterior part become more or less 

 asperate. 



This is a lake species, occurring in water of low 

 temperature, and has been found at Hakone and Chiu- 

 zenji, but is apparently rare. 



Hydrohius iiauper. 

 Oblongo-ovaHs, niger, supra nigro-seneus, antennarum basi, 

 palpis tarsisque rufis; supra crebre punctatus, elytris prseterea 

 seriatim punctatis, interstitiis etiam punctis iuterjectis irregulari- 

 bus parum conspicuis. Long. 7 mm., lat. 3i mm. 



This species is very closely allied to H.fuscipes, auct., 

 more especially to the form recently distinguished by 

 Thomson as H. incicrus, but, compared with the latter, 

 it is found to be rather narrower, to have the punctuation 

 of the upper surface rather finer, and on hinder half of 

 the elytra more scanty, and the striae less marked ; it 

 is, however, most satisfactorily distinguished by the 

 pubescence and punctuation of the hind femora, which 

 is very much diminished in the present species, being 

 confined to a smaller area, and on that area much less 

 dense, and indeed is almost altogether wanting on the 

 posterior portion of the femur. 



Mr. Lewis has brought only a few specimens, and the 

 only recorded locality is Oyama on the main island. 



Hydrohius fuscipes . 

 Dytisciis fuscipcs, L., Faun. Suec, No. 766. 

 Horubetsu, in Yezo ; one example. 



Philydrus haroldi. 



? P. cinctus, Harold, Deutsche Ent. Zeit., 1877, p. 343 

 (nee Say). 



Major, ovahs, convexus, nitidus, uiger, antennis, palpis tarsisque 

 testaceis, palpis articulo pseuilo-basali basin versus late infuscato, 

 antenuavum clava obscura, prothoracis elytrorumque marginibus 

 bruuneo-testaceis, peclibus piceis, supra crebrius puuetato ; meso- 

 sterni processu falcato. Long. 7-i^ mm. 



This species, closely allied to P. japonicus, differs by 

 its considerably larger size, and by the broadly infuscate 

 base of the palpi, as well as by the greater prominence 



