M. Luti-eille on the Geographical Distribution Insects' ''55^ 
We have already said, that the distinction of climates given 
Ijy Fabricius, was in many points arbitrary and injudicious. This 
we now come to confirm, by our general observations on the lo- 
calities proper to the genera of Arachnides and of insects. What 
I wish to attempt is, if possible, to establish, with the resources 
of geography, divisions which may coincide with our actual zoo- 
logical knowledge, and even with that which shall in future be 
acquired. 
Greenland has been to naturalists the extreme ^boundary of 
their researches tov/ards the Arctic Foie. From the examination 
which Otho Fabricius made of its insects, and which, with the 
Arachnides, did not exceed in number 81 species, it appears that 
these animals are, in whole, the same as those of Denmark, of 
Sweden, and more especially of that portion of Lapland which 
rises from the latter kingdom. One may consider the northern 
extremities of Greenland and Spitzbergen, that is to say, the 81st 
degree of north latitude, as the points where vegetation termi- 
nates. But to obviate all difficulty, and for the sake of esta- 
blishing a duodecimal division, which will be convenient and 
frequently agree with my observations, I shall run back, this last 
limit of vegetation three degrees higher, or to the 84th degree. 
We have seen that Lapland had a special Fauna ; that those 
of the south of Sweden, of the north of France, as far as the cli- 
mate of Paris, and of a large portion of Germany, exhibited a 
great similitude; that the southern insects shew themselves for the 
first time to the south of Paris ; and exactly in those places where 
the vine begins to prosper^ by the influence of the mean tern*- 
perature alone. W e have said that the culture of the olive, which 
commences in France between the 45® and 44° of latitude, an- 
nounced more particularly the domain of the species of the south ; 
and that those of still warmer regions appear two or three degrees 
lower, towards the northern limits of those countries in which 
the orange and the palm flourish in the open air. Barbary, 
where the date tree comes to perfection, and where they culti- 
vate the sugar cane, the indigo, the banana, &c. presents us witli 
some genera of insects proper to the countries in the vicinity of 
the equator. Finally, we perceive ourselves to approach it still 
uearer, while viewing the species of the south of Egypt, Senegal, 
