58 M. Latreille on the Geographical Disiribution of Insects. 
demarcation between Asia and America. The other 144® 
will complete the circle of the equator, and will be the extent in 
longitude of the great zone proper to the insects of America. 
We shall divide it equally, and, under the same denomina- 
tions, into two equal portions of 72® each. Thus the circle of 
the equator will be divided into four arcs, of which the value will 
be 72®, 72®, 96®, and 120®, or in the proportion of six-thirtieths, 
-eight-thirtieths, and ten-thirtieths. The extent in longitude of 
the Ancient Continent will comprehend 216®, and that of the 
New 144® ; compared with the entire measure of the Equator, 
they will give the following proportions : eighteen- thirtieths, 
twelve-thirtieths, or nine-fifteenths, six-fifteenths. 
Our lesser zones or climates will be Arctic, or Antarctic, ac- 
cording to their position on this or the other side of the Equi- 
noxial Line. The climate comprised between the 84° of north 
latitude and the 72°, will bear the name of polar climate. 
Advancing towards the Equator, and still continuing the division 
of twelve, we shall have the following : sub-polar^ superior^ 
intermediate, super-tropical, tropical, and equatorial climates ; 
but as I have cut each hemisphere into two great parts, I shall 
distinguish the climates of each of them by the epithet of zeestern 
of eastern. The Antarctic Climate shall only consist of three 
sorts, since we go no further than to the 60° of south latitude ; 
those which I would call Polar and Sub-polar are those sup- 
pressed. The divisions and denominations will be the same fe 
the two Continents. Let us make use of them by some applica- 
tions to the northern and western part of our Continent, being 
that with which we are best acquainted. 
The polar climate will present the insects of the greatest part 
of Greenland, of Iceland, and Spitzbergen. In the sub-polar 
climate we shall find those of Norway, and of the north parts of 
Sweden and European Russia. In these are the insects of the 
coldest countries. We shall place in the superior climate those 
form but an artificial demarcation, like that produced by those of Gibraltar, betu’eeii 
Europe and Africa. The meridian which serves us as the limit between Asia and 
America, cuts in two equal parts the ocean comprised between the maritime coasts 
of Canton, and those of California, which are under the same latitude. It would 
thus form geographically a most natural division. 
