INSECTS IN GENERAL. 97 



Normandy, and Britanny, compared to the provinces of 

 France, situated to the east, exhibit similar approximations. 



M. Latreille, has, as we before hinted, given a new and 

 ingenious division of the earth, into climates or zones, the 

 limits of which circumscribe in an approximating manner, 

 the places of habitation exclusively proper to the different 

 races of these animals. These geographical sections are 

 founded on the following observations :— first, the northern 

 extremities of Greenland and Spitzbergen appear to be, in 

 our hemisphere, the final limit of vegetation. It is arrested, 

 towards the south pole, at the Land of Sandwich, the 7ie phis 

 ultra of geographical discoveries in the Austral hemisphere. 

 The eighty-fourth degree of north latitude, and the sixtieth of 

 south latitude, will thus form the two extremities of that part 

 of our globe, which serves as a habitat for plants and in- 

 sects. Second, the entomology of the new continent, begin- 

 ning at least with the north of the United States, and pro- 

 ceeding southwards, differs even as to species, from the 

 entomology of the old continent. Third, that portion of 

 Greenland, with the zoology of which we have been made 

 acquainted by Otho Fabricius, presents many insects, and 

 even other animals, which may be found again in the most 

 northern and western extremities of Europe. We may thus 

 consider Greenland as forming to the north, and under this 

 point of view, the limit of the two worlds. Fourth, the in- 

 sects of eastern Asia, proceeding from the countries whose 

 longitude is about 62 degrees more east than the meri- 

 dian of Paris, the insects of New Holland, those of that 

 part of Africa which extends from Atlas and the tropic of 

 Cancer, to the southern extremity of that peninsula, differ 

 from the animals of the same class which inhabit the other 

 countries of the old continent. Fifth, a space of latitude 

 measured by the arch of a circle of 12 degrees, produces, 

 abstracting some local variations, a sensible change in the 



VOL. xiv. H 



