NATUKAL HISTOKY, TOKONTO KEGION 



Dytiscidae (Diving-beetles) (Continued). 

 Hydroporus dichrous, Melsh. 

 " modestus, Aube. 



Ilybius biguttulus, Germ. 

 Coptotomus interrogatus, Fab. 

 Agabus seriatus, Say. 

 " punctulatus, Aube. 

 " obsoletus, Lee. 

 " erythropterus, Say. 

 Ehantus binotatus, Harr. 

 Colymbetes sculptilis, Harr. 

 Hydaticus piceus, Lee. 

 Dytiscus fasciventris, Say. 

 " hybridus, Aube. 

 " verticalis, Say. 

 " harrisii, Kirby. 

 Acilius semisulcatus, Aube. 

 Thermonectes basilaris, Harr. 

 Graphoderes fascicollis, Harr. 

 Cybister fimbriolatus, Say. 

 Gyrinidae (Whirligig-beetles). 



Gyrinus dichrous, Lee. 



" ventralis, Kirby. 

 Dineutes assimilis, Aube. 

 Hydrophilidae (Waver-scavenger beetles). 

 Helophorus lacustris, Lee. 



angustulus, Mann. 

 " lineatus, Say. 



" tuberculatus, Gyll. 



Hydrochus excavatus, Lee. 

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