THE BUTTERFLY. 



57 



like a watch-spring ; and, guarding it on either 

 side, a large jointed appendage, densely clothed 

 with scales and hairs, and often projecting for- 

 ward or upward like feathery horns. No other 

 parts are visible, and even when we remove these 

 mufflers of the head, and expose all the parts 

 about the mouth, we shall be puzzled to know 

 what has become of the caterpillar's varied forag- 

 ing parapherna- 

 lia. Its labrum 

 was a swinging 

 flap of mem- 

 brane by which 

 it appeared to 

 force its food 

 between its 

 jaws ; its biting 

 mandibles mas- 

 sive horny 

 plates with 

 chiseled edges, 

 by means of which it nibbled the leaves ; the 

 former is now represented [Fig. 67] by a slight 

 rounded immovable projection of the front, whose 

 only office is to serve as a support to the base of 

 the long spiral tongue ; and the latter, the main 

 agents of the caterpillar's work, are reduced to 

 two little triangular projections, one on either 

 side of the tongue ; they are now soldered firmly 



met 



FIG. 67. Front view of head of Danais Archip- 

 pus, with the scales removed ; oc, compound eyirs; 

 a a, base of antennae; cl, clypeus ; If), labrnm; 

 md. mandible, edged with bristles; tk, base of the 

 maxillae or spiral tongue; x 10 (Burgess). 



