WATER BEETLES IN RELATION TO PQNDFISH CULTURE. 
279 
Fig. 22. — Ventral view of pupa of Copiotomus interrogatus. Fig. 23. — Dorsal view of head of larva of Cybister flmbriolatus. 
Fig. 24— Antenna. Fig. 25.— Dorsal view of right mandible. Fig. 26.— Maxilla. Fig. 27.— Labium. Fig. 28.— Plumose 
hair from prothorax. Fig. 29.— Posterior end of abdomen. Fig. 30.— Labium of adult beetle. Fig. 31.— Foreleg of male, 
showing enlarged tarsal joints and sucking disks. 
