On the Qeogr(qyJiicdVl)lstritutim df Trisects. 233 



unknown, and it is consequently useless to establish, other 

 resrions in this continent. ^^ 



22d, Madagascar and the Anjouan Isles. The entomology 

 of only the south and east of Madagascar is yet known. It is 

 probable that this extensive island has, in this respect, a great 

 analogy to the coast of Africa, opposite to which it is placed ; 

 but as we know nothing of the latter, this relationship cannot 

 be proved. However this may be, this region is very rich, 

 and possesses many peculiar genera, such as Psilocera, which 

 here replaces Collyuris of the Indian Archipelago, Thyreo]^- 

 terus, Hexodon, and Bolybothris, species of Buprestides with 

 very broad elytra, and of a fades imknown elsewhere. A 

 multitude of fine Cetonias, Curculionidae, and Lamias of large 

 size, have likewise been discovered here. The Lepidoptera 

 mostly consist of Acrea, Papilio, Vanessa, and Nymphalides ; 

 some of these are the same as those of Senegal and southern 

 Africa. In the islands of Anjouan the genus Idea re-appears, 

 although it belongs more particularly to the Indian Archi- 

 pelago. 



23d, Isles of Mauritius and Bourbon, to which may be joined 

 the Seychelles Islands. Notwithstanding their limited extent, 

 there is a necessity for making a separate region of these 

 islands. Then- entomology, which is neither rich nor varied^ 

 has an ambiguous /ae«e*, at once African and Asiatic. Their 

 Coleoptera, at least in conspicuous species, are reduced to a 

 restricted number of Curculionidse and Longicornes. In 

 Lepidoptera we do not find a single example of Pieris, 

 Colias, or Acrea ; and in regard to Mauritius and Bourbon, 

 only one species of Papilio occurs in each. The Seychelles 

 islands are not very remarkable for any thing, except a fine 

 species of Phasma, which is confined to them. 



3. — Begions peculiar to the New Continent. ,,,,; 



24th, North America, English and Bussian, bounded on ther 

 north by the polar circle, on the south by the great lakes of 

 Canada, and by a line prolonged westward to the Aleutian 

 Islands inclusively. This region presents a near analogy to 

 the correspoudiug one on the Old Continent. It affords the 

 same genera, and often tlie same species. In Canada, bo^v- 



