WATER BEETLES IN RELATION TO PONDFISH CULTURE. 
283 
Fig. 32. — Side view of pupa of Cybister fimbriolatus. Fig. 33. — Ventral viewofsame. Fig. 34. — Dorsal view of head of larvaof 
Dytiscus verticalis. Fig. 35. — Antenna. Fig. 36. — Maxilla. Fig. 37. — Labium. Fig. 38. — Posterior end of abdomen, show- 
ing cerci. 
