HOW TO KNOW THE BUTTERFLIES 



trachea; opening through the sides of the seg- 

 ments ; the body-segments are grouped into three 



Fig. i. — A butterfly showing the segmented condition of the abdomen. 



regions, the head, the thorax, and the abdomen 

 (Fig. 2) ; they have one pair of antenna; ; they 

 have three and only three pairs of legs ; and in 

 the adult state they usually have one or two pairs 



of wings. 



The class of insects 

 is known to the zool- 

 ogists as the class Hcx- 

 aftoda, a name suggested 

 by the six-footed con- 

 dition of these crea- 

 tures. 



The class Hexapoda 

 is divided into several 

 orders ; thus the beetles constitute the order 

 Coleoptcra ; the two-winged flies, the order Dip- 



Fig. 2. — A wasp showing the divi- 

 sion of the body into head, 

 thorax, and abdomen. 



