PLATE IX. 

 Dytiscidae. 



All the figures are by J. Henry Blake and are magnified twenty diameters. 



Pig. 1. (16899) Coelambus disjectus. 



2. (16908) Coelambus infernalis. 



3. (16909) Coelambus cribrarius. 



4. (16901) Coelambus derelicbus. 



5. (16898) Agabus perditus. 



