1S4 



ETEIOKGS AT TirE SnCROSCOPE. 



level and form a velvety surface. Xow tliese points are 

 the ■w-kitisli bulbous extremities exactly ans^verable to 

 those of the palms of the fly, and doubtless they answer 

 the very same purpose. Only here they are set in far 

 closer array and are a hundred times more numerous ; 

 whence we may reasonably presume a higher power of 

 adhesion to be possessed by the beetle. Tlie structure 

 is best seen in the male, which mav be distin£^lished 

 by its smaller dimensions, and bv its broader feet. 



A still better example of a sucking foot is this of the 



FOOT OF ■WATEr.-BEETLE. 



a. Large sucker, hb. Two smaller suckers. 

 c. Small crowded suckers. 



2. One of the last more enlarged. 



Dyticxis marginalis. It is the great flat oval beetle, 

 which is fond of coming up to the surface of ponds, and 

 hanging there by the tail with its pair of hind legs 



