44 



MECHANICAL FUNCTIONS. 



Difference in the Chry solids of Butterflies and Moths. 

 There are differences between the chrysalids of butter- 

 flies and moths, and also between these species of In- 

 sects, which it is proper to point out at this place. The 

 Fi g- 29. chrysalids of Butterflies are naked, that is, 

 they are not covered with cocoons, but are 

 attached to trees, or other substances, by 

 ' silken cords, passing around the neck, (Fig. 

 28,) or are attached by the tip, and hang 

 suspended as represented by Fig. 29. They 

 are also angular. The antennae of Butter- 

 flies are club-shaped, that is, they are thick- 

 est towards the tip, or end in a bulb, as 



seen by Fig. 30. 



Fig. 30. 



The chrysalids of the Moths, or Millers, as they 



are sometimes called, are commonly short cones 



Fig. 31. composed of several rings, and presenting no 



angles. They are usually enclosed in brown 



silk cocoons, sometimes glued to the sides of 



trees, or fences, and sometimes buried in the 

 ground. A few are naked, and are suspended 

 by the small end. Fig. 31 represents the 

 most common form. Both forms of chrysa- 

 lids are occasionally dotted with spots exactly 

 resembling gold. 



What difference is there [between the chrysalis of a butterfly and a 

 moth 1 What is the difference between the antennae of these insects ? 



