water-hecfhs of Japan. 



463 



Hydeopokus. 

 Hydroporus natrix, Slip. 

 Hypliydrus rivalis, Gyll. 



COLYMBETIDiE. 



Agabus. 

 Agahus japonicus, Shp. 

 ,, optatus, Shp. 

 ,, insolitus, Shp. 

 ,, conspicims, Shp. 



Platynkctes. 

 Agabus dissimilis, Shp. 



Platambus. 

 Platamhus Jimbriatus, Shp. 

 Agabus pictipennis, Shp. 



Ilybius. 

 Ilybius apicalis, Shp. 



COPELATUS. 



Copelatiis japonicus, Shp. 

 ,, ? spec. 



Rhantus. 

 Colymbetes pulverosiis, Steph. 

 Ehantus erraticus, Shp. 



DYTISCINl. 



Dytiscus. 

 Dytiscus sharpi, Wehncke. 

 ,, marginalis, L. 



HYDATIC1D.E. 



Hydaticus. 

 Dytiscus gravimicus, Germ. 

 Hydaticus thermonectoides, Shp. 



,, rhantoides, Shp. 



„ boivringi, Clk. 

 Dytiscus vittatus, Fab. 



Sandeacottus. 

 Sarulracottus hunteri, Shp. 



Geaphodeees. 

 Hydaticus Adansi, Clk. 

 ,, japonicus, Shp. 



Eeetes. 

 Dytiscus sticticus, Linn. 



CYBISTRINI, 



Cybistee. 

 Cybister japonicus, Shp. 

 „ lewisianus, Shp. 

 Dytiscus tripunctatus, 01. 

 Cybister brevis, Aube. 



DiNEUTES. 



DinexUes marginatus, Shp. 



Gyeinus. 

 Gyrinus curtus, Motsch. 

 „ japonicus, Shp. 



GYRINID^. 



Gyrinus gestroi, Eegt. 



Oeectochilus. 

 Orectochilus regimbarti, Shp. 

 ,, agilis, Shp. 



,, punctipennis, Shp. 



HYDEOPHILID^. 



Hydeophilus. 

 Hydrophilus cognatus, Shp. 

 ,, japonicus, Shp. 



Steenolophus. 

 Hydrophilus rujipes. Fab. 



Hydeochaeis. 



Hydrocharis affinis, Shp. 



„ libera, Shp. 



Hydrobius. 

 Hydrohius fnscipcs, L. 

 ,, pauper, Shp. 



Hydeocyclus. 

 Hydrocyclus lacusiris, Shp. 



Philydeus. 

 Philydrus haroldi, Shp. 

 japonicus, Shp. 

 umbratus, Shp. 

 simulans, Shp. 

 subsignatus, Har. 

 uniformis, Shp. 

 i;j7)s, Shp. 

 ornaticeps, Shp. 



Helochaees. 



Helochares striatns, Shp. 



,, lewisitis, Shp. 



Laccobius. 

 Laccobius bedeli, Shp. 

 ,, osciUaiis, Shp. 



