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A Catalogue of North American Diptera (or Two-Winged Flies) (Classic Reprint)

A Catalogue of North American Diptera (or Two-Winged Flies) (Classic Reprint)

1850 руб.
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Excerpt from A Catalogue of North American Diptera (or Two-Winged Flies)

The present work is based upon Osten Sacken's Catalogue of North America Diptera, second edition, published in All the references of that work are embodied in this, with only such changes as later studies seem to require.

Still, the great amount of work which has been done on North American Diptera within the quarter of a century has largely changed the face of the subject. Hence the reader will probably observe, especially at first, more of contrast than resemblance. The number of species has doubled; the number of references to previously known species has almost doubled; several families have been monographed or revised, with more or less change of nomenclature; along with this has gone the publication of a multitude of smaller papers, touching every family but one, and the larger part of the genera. Under these conditions it is inevitable that great changes should appear in the new catalogue. It is the more necessary that I should acknowledge my obligation, which is far greater than appears on the surface.

Fauna! Limits - These, as in the former catalogue, include all of North America, in the widest sense, taking in Panama on the South and Greenland and the Aleutian Islands on the North. The West Indies are included, even down to Trinidad, adjoining Venezuela. There is no place to draw a line between the islands. The Bermudas and the Hawaiian Islands are not included.

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