WATER BEETLES IN RELATION TO PONDFISH CULTURE. 



313 



Fig. 110.— Ventral view of pupa of Berosus striatus. Fig. 111.— The same, B. pantherinus. Fig. 112.— Egg case of Enochrus 

 nebulosus. Fig. 113.— Egg of same. Fig. 114.— Right mandible of newly hatched larva. Fig. 115.— Left mandible. Fig. 

 116.— Antenna. Fig. 117.— Antenna of Enochrus diffusus. Fig. 118.— Labium of nebulosus, ventral. Fig. 119.— Labium of 

 diffusus. 



