The Life-History and Anatomy of Butterflies 



pillars have long, worm-like bodies. Frequently they aie 

 thickest about the middle, tapering before and behind, flat- 

 tened on the under side. While the 

 cylindrical shape is most common, there 

 are some families in which the larvae 

 are short, oval, or slug-shaped, sometimes 

 curiously modified by ridges and promi- 

 nences. The body of the lame of lepi- 

 doptera consists normally of thirteen rings, 

 or segments, the first constituting the 

 head. 



The head is always conspicuous, com- 

 posed of horny or chitinous material, 

 but varying exceedingly in form and 

 size. It is very rarely small and retracted. 

 It is generally large, hemispherical, 

 conical, or bilobed. In some families it 

 is ornamented by horn-like projections. 

 On the lower side are the mouth-parts, 

 consisting of the upper lip, the mandibles, 

 the antennas, or feelers, the under lip, the 

 FIG. i2.-Caterpillar of maxillae, and two sets of palpi, known as 



Papiho philenor (Riley). ... , , , ,. , , . T 



the maxillary and the labial palpi. In 



many genera the labium, or under lip, is provided with a 

 short, horny projection known as the spinneret, through 

 which the silk secreted by the cater- 

 pillar is passed. On either side, 

 just above the man- 

 dibles, are located the 

 eyes, or ocelli, which 

 in the caterpillar are 



. . FIG. 14. Head of caterpillar 



Simple, round, Shining O f Anosia plexifpus, lower side, 

 prominences, generally magnified 10 diameters: lb, la- 

 FIG. 13. Head c J brum, or upper lip; ma. mandi- 

 of caterpillar of only to be clearly dlS- bles; mx, maxilla, with two 

 Papilio aste- t j n rmj s hed by the aid P al P<; K labium, or lower lip, 

 n#s, front view, . J , with one pair of palpi; s, spin- 

 enlarged. Of a magnifymg-glass. neret; a, antenna; o, ocelli. 



These ocelli are fre- (After Burgess.) 



quently arranged in series on each side. The palpi are organs 

 of touch connected with the maxillae and the labium, or under 

 lip, and are used in the process of feeding, and also when the 



6 



