CHAPTER VI 



BUTTERFLY'S TONGUE, EYE OF DYTIS- 

 CUS, TONGUE OF HONEY BEE, AND 

 LEG OF HONEY BEE 



The Butterfly's Tongue. 



E structure of the proboscis or tongue 

 of the butterfly is inconceivably delicate. 

 Throughout its whole length it consists of two 

 half-tubes, which are convex on the outside 

 surfaces and concave on the inner, so that 

 when the two are brought together they form 

 a complete tube, which is lined with a very 

 smooth membrane. Each half-tube is sup- 

 posed to be an extended maxilla. In some 

 butterflies the tips possess a great number of 

 delicate papillae or fringes. 



Each maxilla is made of innumerable rings 

 connected and moved by a double layer of 



