MEMOIR OF LATRE1LLE. 
29 
tliis 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- 
orurn et Insectorum secundum ordinem naturalem 
in familias disposita, &c. published at Paris in 
1806-1809, in 4 vols. 8vo. It is a luminous expo- 
sition of the principles of natural arrangement laid 
down 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 : — 
