ARTHROPODA 



fly at twilight. Generally, when at rest, the butterflies 

 keep their wings raised vertically, while the others hold 



FIG. 74. Fruit Moth (Carpocapsa pomonella) : b, larva; a, chrysalis; c, imago. 



theirs horizontally. The pupa of the former is unpro- 

 tected, and is usually suspended by a bit of silk ; the 

 pupa of the moths is in- 

 closed in a cocoon. 



From twenty-two thou- 

 sand to twenty-five thou- 

 sand lepidopterous species 

 have been identified. Some 

 of the most common but- 

 terflies are the swallow-tail 

 Papilio, the white Pieris, 

 the sulphur-yellow Colias ; 

 the Argynnis, with silver 

 spots on the under side of 

 the hind wings; the Va- 

 nessa, with notched wings. 



The Sphinges exhibit little FlG 75-- Head of a Caterpillar, from be- 



neath: a, antennae; b, horny Jiws; c, 



Variety. They have 



thread of silk from the conical fusulus, 

 ,. , , on either side of which are rudimentary 



row, powerful wings, and palpi . Magnified. 



