DYTTSCIDiE. 
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I. Hydroporides— 
1. Hydroporini. —Hydroporus, 4; Hyphoporus, 9; Hyphy- 
drus, 3 ; Clypeodytes, 6 ; Bidessus, 6 ; Yola, 1. 
2. Hydrovatini — Hydrovatus, 15. 
3. Methlini. —-Methies indicus, Keg. 
II. Noterides— 
Hydrocoptus, 4 ; Canthydrus, 6 ; Hydrocan thus indicus, We. 
III. Laccophilides— 
Laccophilus, 15 ; Neptosternus, 2. 
IV. Dytiscides— 
1. Colymbetini. —Agabus, 10 ; Platynectes, 3 ; Lacconectes, 5 ; 
Copelatus, 7 ; Rhantus, 5 ; 
2. Hydaticini. —Prodaticus pictus, Shp. ; Hydaticus, 8. 
3. Thermonectini. —Sandracottus, 3. 
4. Eretini. —Eretes sticticus, Linn. 
5. Cybistini. —Cybister, 17. 
Hyphoporus includes small oval thickset beetles found widespread 
in wells and tanks. H. aper, Shp., appears to be the commonest plains’ 
species. Copelatus indicus, Shp., is a small dark insect, abundant in 
rice fields and found under the bark of trees during the time when the 
fields are dried up. Hydaticus Fabricii , Mch., and H. vittatus, Fabr., 
are the commonest plains species of this genus, medium sized brown 
insects found in tanks. Sandracottus Dejeani , Aub., is widespread and 
abundant in wells and tanks, a handsome black and brown mottled 
insect of moderate size. 
Eretes (Eunectes) sticticus, Linn., is also extremely abundant and 
common ; its larva feeds on Culex larvae. Cybister includes the large 
forms which take the place of the European Dytiscus ; Cybister confusus, 
Shp., is the large black water beetle with the lateral brown stripe 
found in fresh water in the plains. C. tripunctatus, 01. var. asiaticus, 
Shp., is smaller, also abundant in rice fields and tanks. 
