WATER BEETLES IN RELATION TO PONDEISH CULTURE. 



327 



Fig. 137.— Head of larva of T. glaber. Fig. 138.— Head of larva of T. mixtus. Fig. 139.— Ventral view of pupa of lateralis. 

 Fig. 140.— The same, glaber. Fig. 141.— The same, mixtus. Fig. 142.— Fag of egg case of mixtiis. 



