NATURAL HISTORY, TORONTO REGION 
Dytiscidae (Diving-beetles)—(Continued). 
Hydroporus dichrous, Melsh. 
eS modestus, Aubé. 
Tlybius biguttulus, Germ. 
Coptotomus interrogatus, Fab. 
Agabus seriatus, Say. 
“  punctulatus, Aubé. 
“ ~ obsoletus, Lec. 
“ erythropterus, Say. 
Rhantus binotatus, Harr. 
Colymbetes sculptilis, Harr. 
Hydaticus piceus, Lee. 
Dytiscus fasciventris, Say. 
* hybridus, Aubé. 
verticalis, Say. 
harrisii, Kirby. 
Acilius semisulcatus, Aubé. 
Thermonectes basilaris, Harr. 
Graphoderes fascicollis, Harr. 
Cybister fimbriolatus, Say. 
Gyrinidae (Whirligig-beetles). 
Gyrinus dichrous, Lec. 
“ventralis, Kirby. 
Dineutes assimilis, Aubé. 
Hydrophilidae (Waver-scavenger beetles). 
Helophorus lacustris, Lec. 
i angustulus, Mann. 
lineatus, Say. 
tuberculatus, Gyll. 
Hydrochus excavatus, Lec. 
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