PLATE XIV. 

 [Proc. Wash. Acad. Sci., Vol. II, PI. XXIII. ] 



Dytiscus dauricus Gebler. 



FIG. i. Dorsal view of larva (Xf ) 



2. Under surface of the head (X6-5). 



Agabus tristis Aub6 



FIG. 3. Dorsal view of larva (X7-75)- 



4. Maxillae and labrum (X35)- 



5. Mandible (X35)- 



6. Ventral view of pupa (X7-75)- 



(204) 



