48 THE CHRYSALIS. 



plunged into the silk the caterpillar has spun for 

 the purpose, and, becoming entangled in it, keep 

 the chrysalis in place. In the family of blues and 

 hair-streaks, where the chrys- 

 alis is bound closely to the 

 surface of rest, and the last 

 joint of the abdomen is curved 

 under the bodv, these hooks 



a b 



_, are seated upon the segment 



Fio. 64 a, La=t segment 



there is invariably some pro- 

 longation of the tip, which 

 bristles with hooks. 



By this review, we see how admirably the form 

 and projections, the position and inactivity of 

 the chrysalis are adapted to its purpose. Great 

 changes are to transpire in the hidden recesses of 

 the body ; the outer integument becomes a com- 

 pa,ct, hardened case, protected at every needed 

 point by roughened projections or callous shoul- 

 ders ; all the appendages are securely ensheathed 

 and so cemented to the outer integument as to 

 form part and parcel of it, without disturbing its 

 contours ; all unnecessary openings are firmly 

 closed, and those that remain are carefully guarded 

 by dense callous spots ; and in addition hooked 

 claws, attached to the thickened tail, fasten the 

 swinging mummy securely in its place. From 

 this inert mass shall suddenly spring, like well- 



