ARTHROPODA. 



301 



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 pumping up ^'°' 2"2.— Part ot the Wing of a Moth {Satm-nia), 

 r for niagnifled to show the airangemenl of scales. 



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 

 antennae, 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 antenna are 

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

 the Butterflies keep their wings raised vertically, while 



Pi9. 2T3. — VanesHa polyeJilorot, or 

 terfly." 



'Tortoise-shell But- 



