28 THE CATERPILLAR. 



ment of subsequent moultings may be likened to 

 a new spring suit, very like the old one, but 

 bright and clean ; while the difference of arma- 

 ture accompanying the first moult is more like 

 the difference between the dress of a child and a 

 man. The dress of our manhood differs as much 

 from that of our infancy as it does from the dress 

 of a savage ; in like manner the outfit of a full- 

 grown caterpillar differs as much from its outfit 

 at birth as it does from that of a caterpillar be- 

 longing to a different tribe. 



To present a few examples : The mature cater- 

 pillars of our brown meadow butterflies or satyrs 

 (Oreades) have a rough skin, the result of a mul- 

 titude of minute tubercles ; each of these tuber- 

 cles bears a simple hair, scarcely visible to the 

 naked eye. In the young caterpillar of four dif- 

 ferent genera of these butterflies which I have 

 studied, the skin is smooth, and instead of being 

 supplied with an almost innumerable number of 

 microscopic hairs, is furnished, in some instances, 

 with an exceedingly scanty number 

 of little club-shaped bristles, pro- 

 portionally many times longer than 

 FIG. 36.- Bristle the hairs of the adult, and arranged 



of sEm-y- in definite longitudinal series [Fig. 



36] ; in others it is furnished with 



flattened ribbon-like hairs, as long as the body, 



serrated on one edge and bent in the middle 



