178 OTHER MEMBERS OF THE CLASS — INSECTA 



Fig. 119. — Dog-day liarve.9tfly. 



They are often exceedingl}' injurious and, hence, of great 

 economic importance. The San Jose scale insect is prob- 

 ably the most imjiortant 

 species in the United 

 States (Fig. 120). It is 

 a great j^est to apple, 

 jicar, and ]:)each trees. 



Butterflies and moths. 

 — The l)uttcrflies and 

 moths constitute the 

 well-known order Lepi- 

 doptern ( scale \^'ing) . 

 Tlie irinijs are four in 

 nurnher iind clothed icith 

 Jine delicate .sirde.s. The 

 ))ietai))orphosis is com- 

 plete, the mouth ports are 

 formed for sucking, and 



Fir,.120. — SanJo.esciklns.ft m, male (l,e InrVlT Ore Called COtCr- 

 scale; 7", tern lU ,'^cale, ,/, > »uiig scale; 

 i(, young insect. Enlarged. pUlCl) S. 



