PLATE 111 



FIG. I. SURFACE VIEW OF PART 



OF THE COMPOUND EYK OF AN 



INSECT, SHOWING THE HEXAGONAL 



FACETS 



FIG. 2. PART OH AN ANTENNA OF THE 



COCKCHAFER, SHOWING THE DELICATE 



HAIRS, AND THE MINUTE PITS WHICH 



COVER THE SURFACE OF THE LOBES 



FIG. 3. FOOT OF A FLY, SHOWING THE 



PADS USED FOR WALKING ON GLASS 



AND OTHER SLIPPERY SURFACES 



TRACHEA!. TUBES OF DYTISCUS 

 BEETLE' 



