Tfie Numerical Relations qf'Aniitials. 



99& 



It may not be uninteresting, as regards insects, to compare 

 the progress of the classes and species with the number of ge- 

 nera, between Linnaeus in 1767, Fabricius from 1794 to 1805, 

 and Latreille, in the 2d edition of Cuvier's Regne Animal, in 

 1829: 



Number of Genera- 



Cnistacea, 



Arachnida, 



Insecta, 



Coleoptcra, 



Ortlioptera, 



Hemiptcra, 



Linnaeus. 

 ft • 



4 



30 

 12 



* Dictionnaire des Sciences Naturelles, torn, xlvii. vcrg. : the Leech, 

 which he separates, and of which he enumerates 39 species, is here included. 



-f- The number of Crustacea, Arachnida, and Lepidoptera, are from Fa- 

 bricius, Entomologia Systematica, 1793 and 1794; the other orders of Insects 

 are according to his Systema Antliatorum, llhyngotorum, &c Humboldt 

 enumerates 44,000 species of Insects ; Sachs in the Berlin Zeitung 50,000 

 Insects, 26,000 Arachnida? 1500 Crustacea. 



