262 



INTRODUCTION TO ZOOLOGY 



CHAP. 



The tarsus appears to be four-jointed only, but in some 

 cases another very small joint can be detected. 



The larvae of these insects feed on very various substances ; 



FIG. 197. The Birch Weevil (Rhynchites betulae). 

 a, The full-grown insect, natural size ; ft, the birch leaf rolled by the weevil. 



one, a very short -snouted form, the Pea Weevil, lives in 

 ripening peas, and the larva on emerging makes the little 

 circular holes often noticed in them. Another, the Nut 



