. Storia naturale. Zoologia. MILLEPEDES e insetti. SSI trovato in Sud Africa e in varie parti del tlie Indie ad ovest e Sud America, come pure in Australia e Nuova Zelanda. Peripatus inliformis (Guilding), dall'isola di Saint Vincent, è di circa due pollici di lunghezza. (Vedere Fig. 24). Till'.!. Fin. a.-Peripatus iulifonms (Gilda.). Classe V.-INSECTA. Gli insetti sono di gran lunga la più numerosa classe di animali che popolano il mondo nel momento presente. Il numero effettivo di specie nei nostri elenchi non possono essere molto meno di 300.000 ; e molte migliaia di nuove specie sono descritte ogni anno. In questo conteggio

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. Natural history. Zoology. MILLEPEDES AND INSECTS. SSI found in South Africa, and in various parts of tlie West Indies and South America, as well as in Australia and New Zealand. Peripatus inliformis (Guilding), from the Island of St. Vincent, is about two inches long. (See Fig. 24). Till'.!. Fin. a.—Peripatus iulifonms (Guild.). CLASS V.—INSECTA. Insects are by far the most numerous class of animals which inhabit the globe at the present time. The actual number of species on our lists cannot be much less than 300, 000 ; and many thousands of new species are described every year. In this country alone we have between 12, 000 and 13, 000 species, although our fauna is exceedingly poor, not only as compared with that of tropical countries, but even in comparison to that of Con- tinental Europe. Only a few families and orders of insects Number of are at all adequately known at present, and those only as Species existing in the best-explored countries. The late Professor of Insects. Riley estimated the probable number of existing species of insects at possibly ten millions ; and such estimates are generally far below the mark. The alternative estimate of two millions, which is put forward by some entomologists, seems to me to be ridiculously low, when we consider that the world has been so badly explored that we are not yet acquainted with a dozen species of Phasmidce, or stick-insects, from Madagascar, an island which has been visited by many collectors, while the Phasmkhi' are not a group of small and obscure insects, but one which includes many very handsome and conspicuous species, and to which belong the largest of all known insects. To take another illustration, Mr. E. Ernest Green is now working at a monograph of the Coccichr, or scale-insects, of Ceylon. Very few species were previously known from that island, and he will probably be easily able to multiply them at least by ten. Nevertheless, insects, like the plants on which they feed, are becoming. Please no

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• bookauthorly
• bookcentury1800
• bookdecade1890
• booksubjectzoology