INSECTS 



293 



8. Lepidoptera. — Jaws for sucking, formed by the maxillae 

 only. Four wings alike and covered with scales, as is 

 also the body. Metamorphosis complete. Butterflies and 



Fig. 200. — The Common Flea (Pulex irritans). 



A , Larva ; B, pupa ; C, adult. 



Moths. Butterflies are the members of one of a number 

 of groups into which Lepidoptera may be divided. They 

 have knobbed antennae (rare among moths), no frenulum 

 (a bristle on the hind wing of most moths, which links it 



Fig. 201. — The Heart-and-Dart Moth (Agrotis exclamationis). — 

 From Theobald, after Curtis. 



i, Imago ; 2, larva ; 3, earthen case ; containing 4, pupa. 



with the fore wing), a habit of folding the wings upward 

 over the back and not down at the sides, and daylight 

 flight. The caterpillars of Lepidoptera have biting mouth- 



