THE CHRYSALIS. 



exposed to view in the hardened chrysalis are the 

 tibiae and tarsi of the front and middle legs. In 

 front of and lying between the anterior legs is 

 another pair of sheaths whose inner edges unite 

 along the middle of the body and which at base 

 are broader than the legs, but which taper to 

 slender parallel threads ; these generally extend 

 to the wing- tips, pushing their way between legs 

 and wings, which thus abut against them ; these 

 are plainly the sheaths in which lies the slender 

 elongated tongue of the butterfly, 

 but the extent of the basal por- 

 tion is beyond all need, and some 

 writers have asserted that they 

 formed the covering for the front 

 legs as well as the tongue, and 

 that the sheaths which really en- 

 case the front and middle legs 

 covered the middle and hind legs 

 respectively. If the naturalists 

 who first made this discovery had 

 but used the scalpel for five min- 

 utes, their mistake would never 

 have occurred [Fig. 51]. In real- 

 ity this expanded base of the 

 sheath covering the tongue af- 

 fords protection also to the palpi which lie beneath 

 and beside the tongue ; yet even in those groups 

 where the palpi are small and the front legs long, 



FIG. 51. The same 

 as Fig. 50, with the 

 covering of the legs 

 and part of the wing 

 of one side removed, 

 to show how the hind 

 tibia and tarsus are 

 concealed beneath the 

 wings; x 2. The third 



ir of less is seen be- 



pan 

 low 



the antennae. 



