MEMOIR OF LATRE1LLE. 29 



this place to all the works he published at different 

 times ; the very full list of them attached to the 

 end of this biographical notice will indicate the ex- 

 tent of his labours, and prove useful, it is hoped, to 

 the student who follows in the same track. Most 

 of them appeared in periodicals, and all were re- 

 ceived with great favour, as indicating extensive 

 knowledge, sound and enlightened views, and no 

 small degree of learning. The work which defi- 

 nitely fixed his reputation as the first entomologist 

 of the age, was the well known Genera Crustace- 

 orum et Insectorum secundum ordinem naturalem 

 in familias dlsposita, &c. published at Paris in 

 1806-1809, in 4 vols. 8vo. It is a luminous expo- 

 sition of the principles of natural arrangement laid 

 dow r n in his first work on the subject, and ever since 

 its appearance has formed a principal guide to the 

 student of Entomology. In this work the Linnean 

 Insecta are divided into two groups or classes of 

 equivalent value, Crustacea and Insecta, the former 

 of which he characterises as possessing a heart and 

 breathing by bronchia?, and the latter as breathing 

 by tracheae. The class Insecta, the arrangement of 

 which we shall give in a synoptical form as an ex- 

 ample, is divided in the following manner : — 



