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Книга по требованию: Transactions of the South African Philosophical Society, Vol. 7

Товар № 11245199

A Descriptive Catalogue of South the Coleoptera of South Afirca (Classic Reprint)

Вес: 1.05 кг.
Год издания: 2015
Страниц: 672 Переплет: мягкая обложка
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Excerpt from Transactions of the South African Philosophical Society, Vol. 7: A Descriptive Catalogue of South the Coleoptera of South Afirca

This first part of a descriptive catalogue of the South-African Coleoptera is intended to facilitate the identification of the insects belonging to that order.

A local fauna can only give an approximate idea of that of a continent, or of a well-defined area of distribution; it has, however, an advantage, inasmuch as the identification of a limited number of species is made easier for the beginner.

I have taken as a limit to the South-African fauna a line running roughly from Mozambique in the East to Mossamedes in the West, or about 16° of latitude South.

This limit is, of course, an arbitrary one, as all such limits must perforce be, but I have adopted it because the difference, generic as well as specific, seems to me to be more marked four degrees north of that line (10° S.L.) than four degrees south of it (20° S.L.)

On the Eastern side this difference is not so striking as in the West, and there exists a great affinity with the fauna of the Zanzibar mainland, Mombassa, Somaliland and Abyssinia.

All along the sea-coast extends a narrow tropical belt, which seems to end in the neighbourhood of D'Urban, Natal, and where many of the most northern types occur, and I believe that if the sea-board extending from D'Urban to St. Lucia Bay was carefully searched, nearly all the species found on the 14° of lat. would also be met with there.

In the west the difference in the fauna from that of the East is very sensible and the 22° longitude may be regarded as a good dividing line, and it is in the Cape Colony that this change is especially striking, the coleoptera of Little Namaqualand differ widely from those of Natal.

The fauna of Damaraland and Ovampoland is also greatly differentiated from that of Central Angola.

I have adopted the use of Genera and Sub-Genera, of Species and Varieties. It is so difficult now-a-days to agree on the respective value of some generic and specific characters that I prefer to leave to the student to decide if the small difference of colouring, size or sculpture, of what I consider a variety, should be regarded as constituting a species.

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