OUTLINES OF ENTOMOLOGY. 



83 



ening them in place with what look like long stitches of coarse, white 

 silk. They leave their cases at night to feed, and when one case is 

 outgrown they construct a new one. They change to pupae within their 

 leafy homes and further enclosed in a lace-like silken cocoon. The 

 chrysalis is smooth and oval, often covered with a fine powder or 

 " bloom," and is suspended by the tail. The Tityrus skipper (Euda- 

 mus tityrus, Fabr.), the larva of which feeds on the locust and acacia, 

 is the largest and best known species. 



CHAPTER XXII. 



Order LEPIDOPTERA. Sub-Order HETEROCERA. 

 MOTHS. 



Fi 5 . 34. 



Corn-worm (Heliothis a^migera) after Kiley; a, b, 

 egg magnified ; c, larva; d, pupa; e, f, imago or moth. 



The moths greatly exceed the butterflies in number of species and 

 individuals and in diversity of size, structure and habit. Among them 

 may be found some (tropica?) species whose expanded wings measure a 

 foot from tip to tip, and others whose wing expanse is scarcely one- 

 eighth inch. Some forms are slender and graceful, and can scarcely 

 be distinguished from butterflies ; others, when on the wing, might 

 easily be mistaken for bees or wasps; still others simulate beetles, 

 while a few, destitute of wings, and in some cases of legs also, present 

 the appearance of over-grown maggots or grubs. In the peculiarities 

 of their development, also, the entomologist finds a field of inexhaust- 



