462 



Mr. David Sharp on the 



Very closely allied to the European C. atomarium, but 

 snialler and paler, and readily distinguished by the much 

 feebler punctuation of the surface. Like its European 

 congener, it varies considerably in size and in depth of 

 coloration. 



Found at Otsu and Otaru. 



Pachysternum hcemor'rhoum. 



Pachysternum hcemorrhoiim, Motsch., Bull. Mosc, 1866, 

 i., p. 168 ; Von Harold, Deutsche Ent. Zeit., 

 1878, p. 69 ? ? 



I still fail to identify this insect, and think it very 

 doubtful whether Harold was correct in his identification 

 of it. Indeed, I should suppose the latter entomologist 

 was speaking of Megastermim distinctum were it not for 

 his saying that the thorax is " sehr fein punktirt." For 

 some further remarks on Harold's views as to this 

 species cf. Ent. iMo. Mag., xv., pp. 278 — 9. 



List of Japanese Water-Beetles. 



Haliplus. 

 Haliplus oralis, Shp. 



HALIPLIDiE. 



Haliplus sharpi, Wehncke. 

 ,, japonicus, Shp. 



DYTISCIDiE. 



NOTEEID.E. 



NOTERUS. 



Noterns japonicus, Shp. 



Canthydkus. 

 Ili/dnxunitliKx ^jo?(7h.s', Shp. 



LACCOPHILINI. 



Laccophilus. 

 Laccophilits lewisius, Shj). 

 „ fle.ruosiis, Aub6. 



,, (lifficilis, Shp. 



,, Kobcnsis, Shp. 



HYDROPOEID.E. 

 Hydhovatus. 

 lli/drovatiis acumiiiatus, Motsch, 



BiDESSUS. 



Bidessus frontalis, Shp. 

 Hydroporus japonicvs, Shp. 



Hyphydrus. 

 Hyphydru'i jajjonicus, Shp. 

 „ frontalis, Shji. 



,, htviiientris, Shp. 



CcELAiyiBUS. 



(hrhimbns vittattis, Shp. 



Deeonectes. 

 l)('ro)iectes anclioralis, Shp, 

 ,, simpUci2)es, Shp. 

 host His, Shp. 



