ARTHROPODA. 



301 



FlG - 272 -~ Part of the Win of a Moth 



magnified to show the arrangement of scales. 



colors, and are often arranged in patterns of exquisite 



beauty. They are in reality modified hairs, and every 



family has its partic- 



ular form of scale. 



The head is small, and 



the body cylindrical. 



The legs are of but 



little use for locomo- 



tion. All the mouth 



parts are nearly obso- 



lete except the maxil- 



lae, which are fash- 



ioned into a " probos- 



cis " for pumpino" UP 



the nectar of flowers. 

 The larvae, called " caterpillars," have a worm-like form, 

 and from one to five pairs of abdominal legs, in addition 

 to the three on the thorax. The mouth is formed for mas- 



tication, and (ex- 

 cept in the larvae 

 of Butterflies) the 

 lip has a spinneret 

 connected with silk- 

 glands. 



There are three 

 groups : the gay 

 Butterflies, having 

 knobbed or hooked 

 -Tortoise-sheii But- ante nn83, and flying 

 in the day only ; 

 the dull-colored Sphinges, with antennae thickened in the 

 middle, and flying at twilight ; and the nocturnal Moths, 

 which generally prefer the night, and whose antennae are 

 thread-like and often feathery. Generally, when at rest, 

 the Butterflies keep their wings raised vertically, while 



Fis. 273. Vanessa polychloros, or 

 terfly." 



