THE LOCALITY SYSTEM. 385 



Lutreille^s 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 

 twelves insect zones or climates, thus: — 



I. Arctic, all North of the Equator. 



1. Polar. 



2. Sub-polar. 



3. Superior. 



4. Intermediate. 



5. Supra-tropical. 



6. Tropical. 



7. Equatorial. 



II. Antarctic, all South of the Equator. 



1. Equatorial. 



2. Tropical. 



3. Supra-tropical. 



4. Intermediate. 



5. Superior. 



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 

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

 cording to this system, that the puma of America re- 

 places the lion of Africa, or that the pecari represents 

 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 



VOL. XII. 33 



