200 



SYSTEMATIC ARRANGEMENT. 



surface, viz. the augmentation of their numbers mil 

 an increase of temperature : * 



In like manner may be exhibited, in a gene 

 way, the relative amount of the genera into which 

 a given number of the species of certain countrie 

 or entomological regions have been grouped : 



ORDER II. ORTHOPTERA. 

 In immediate succession to the order of which we 



In making this attempt, it was of course necessary that 

 as nearly as possible the same extent of the different countries 

 should be compared with each other. 



