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Annals Entomological Society of America [Vol. XIII, 



microlepidoptera. In the families in which the mode of life 

 has become static, the species are limited not only to the kind 

 of plant, but are, except in a few Noctuidae, confined almost 

 wholly to leaves of terrestrial flowering species. 



TABLE I. FOOD SUPPLY. 



Note — Parentheses indicate rare or unusual sources of food for the group named. 



Returning to our original figure of speech, nature has taken 

 a fundamental structure and a relatively constant environment 

 and through superficial modifications has developed a great 

 dominant order. She has exposed the members to every form 

 of attack from parasites and enemies. She has made them both 

 conspicuous and slow, with onl}^ moderate fecundity. But by 

 providing them with the most universal and abundant source of 

 food she has so developed their vitality that they have become 



