MEMOIR OP LATREILLE. 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 
c^ the age, was the well known Genera Crustace- 
orum ei Insectorum secundum ordinem naturalem 
in familiae disposita, &c. published at Paris in 
1806-1309, in 4 vols. 8vo. It is a luminous exfK)- 
sition of the principles of natural arrangement laiti 
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 bronchiae, and the latter as breathing 
by tracheas. The class Insecta, the arrangement of 
which we shall give in a synoptical form as an ex- 
ample, is divided in the following manner :— 
