LOCALITY SYSTEM. 385 



Latreilles Geographical Classification. 



This celebrated French systematist has written a 

 curious and ingenious paper on the Geography of 

 Insects, as a companion to Humboldt's famous 

 Geography of Plants. He divides the globe into 

 twelve insect zones or climates, thus : 



I. ARCTIC, all North of the Equator. 



1. Polar. 



2. Sub-polar. 



3. Superior. 



5. Supra-tropical. 



6. Tropical. 



7. Equatorial. 



4. Intermediate. 

 II. ANTARCTIC, all South of the Equator. 



1. Equatorial. 



2. Tropical. 



4. Intermediate. 



5. Superior. 



3. Supra-tropical. 



Connected with this subject is the doctrine of 

 Representation and Replacement, by which it is 

 maintained, that when a particular species of insect, 

 or other animal, is not found in two several coun- 

 tries or districts, such as Britain and New England, 

 it is represented or replaced by some species resem- 

 bling it in form and in function. Taking a more 

 popular example than insects furnish, it is held, ac- 

 cording to this system, that the puma of America 

 replaces the lion of Africa, or that the pecari repre- 

 sents in Mexico the hog of Europe. 



THE TRANSFORMATION SYSTEM. 



BY consulting our previous volume on Insect Trans- 

 formations, it may be seen that there are considerable 

 differences in this circumstance among various species. 

 These, the illustrious Swammerdam, whose accurate 

 observations are now as valuable as when they were 



