1920] 



Fracker: Lepidoptera 



173 



while in a few species the pupa or adult manages to survive the 

 winter. 



The fundamental basis of lepidopterous development appears 

 to be the combination of a universal food supply with a remark- 

 able uniformity in structure in all stages. Thousands of species 



TABLE HI. BROODS AND HIBERNATION. 



Note — Parentheses indicate the life history in the southern states or under indoor or stored-product 



conditions. 

 E— Egg; L — Larva; P — Pupa; P-A— Emergence during hibernation reported; A — Adult. 



have evolved, all different in appearance, armature, and super- 

 ficial characters, but remarkably alike in functional external 

 organs of ingestion and locomotion. The "butterfly" is the 

 proverbial example of superficiality but the lepidopterous larva 

 and adult have such a healthy, tremendously vital basis on 

 which to build that they must be considered in every sense 

 successfully adapted to their world. 



