bakp:r : hvdrobius fuscipes. 



333 



whose purpose is evidently to 

 keep the body of the pupa from 

 resting on the damp earth. The 

 anus is terminated by two long 

 sinuate circi similar to those of 

 the pupa of Hydrocharis figured 

 by Schioedte. Although incapable 

 of locomotion, the pupa is far 

 from motionless, but wriggles 

 about and moves its abdomen 

 freely on being brought to the 

 light or touched. After spending 

 three weeks in this state the 

 perfect insect emerges. 



This beetle, unlike all other 

 aquatic beetles I know of, is 

 born with the sexual organs mature, and in three, weeks' time the 

 newly-hatched beetle forms a cocoon of eggs, and the process is 

 repeated. Owing to this fact it is possible at the end of August 

 to obtain all the stages of its life-history. 



Fig. 9. Pupa, ventral aspect. X2. 



(P 



