LARVAL FOR:\rS OF COLEOPTERA 



A. 



B. 



C. 



D. 

 E. 

 F. 

 G. 

 H. 



I. 

 J. 

 K. 

 h. 

 M. 



Plate 6 



Dytiscidae, Gyrinidae 

 Hyclaticiis transversalis Pontopp. (Denmarl; 



Hypliydriis ovatus L. (Denmark) 



Dinentes americanus Say 

 Hydaticiis transversalis 

 Hyphydrns ovatus 

 Hydatiens transversalis 



Dinentes americanus 



Head. Ventral 

 view. 



Head. Ventral view. 

 Tip of eighth abdominal 



segment. 

 Head. Lateral view. 

 Leg. 



Larva. Dorsal view. 

 Larva. Dorsal view. 

 End of abdomen. Lateral 



view. 

 Mandible. 

 Maxilla. 



Larva. Dorsal view. 

 Antenna. 

 Head. Ventral view. 



1)8 



