WATER BEETLES IN RELATION TO PONDFISH CULTURE. 



307 



Fig. 92.— Ventral view of pupa of Dineutes americanus. Fig. 93.— Dorsal view of the same. Fig. 94.— Head of adult beetle with 

 old larva head still adhering to it. For some reason the epicranial suture did not open and allow the larva to withdraw its 

 head at the time of pupation. Fig. 95.— Antenna of larva of Berosus paniherinus. Fig. 96. — ^Right mandible of Berosus 

 striatus. Fig. 97.— Left mandible of same. Fig. 98.— Left mandible of B. pantherintis. Fig. 99.— Maxilla of striatus. Fig. 

 100. — Maxilla of pantherinus. Fig. 101. — Labium of striatus. 



