PLATE VII 



FIG. I. CADDIS LARVAE WITH CASES 



MADE OUT OF PIECES OF LEAVES 



AND TWIGS 



FIG. 3. THE MALE DYTISCUS BEETLE 



FIG. 2. THE RESPIRATORY TUBE, AM) 

 TAIL OF THE LARVA OF THE GNAT 



FIG. 4. FRONT LEG OF THE MALE DYTISCUS 



BEETLE, MAGNIFIED TO SHOW THE CURIOUS 



SO-CALLED SUCKERS 



