The remaining genera mostly consist of single species, and are pretty equally distributed over the various parts of the world indicated in the preceding list. Madagascar, the Seychelle Islands, Chili, the Sandwich Islands, South Africa, Tahiti, the Philippine Islands, New Caledonia, and Australia—all have peculiar genera, while two new ones have recently been described from Persia.

Family 50.—IGUANIDÆ. (56 Genera, 236 Species.)

General Distribution.
Neotropical
Sub-regions.		Nearctic
Sub-regions.		Palæarctic
Sub-regions.		Ethiopian
Sub-regions.		Oriental
Sub-regions.		Australian
Sub-regions.
1. 2. 3. 41. 2. 3 —— — — —— — — —— — — —— — 3 —

The extensive family of the Iguanas is highly characteristic of the Neotropical region, in every part of which the species abound, even as far as nearly 50° South Latitude in Patagonia. They also extend northwards into the warmer parts of the Nearctic region, as far as California, British Columbia, and Kansas on the west, and to 43° North Latitude in the Eastern States. A distinct genus occurs in the Fiji Islands, and one has been described as from Australia, and another from Madagascar, but there is some doubt about these. The most extensive genera are:—

Anolius (84 sp.), found in most parts of Tropical America and north to California; Tropidolepis (15 sp.), which has nearly the same range; Leiocephalus (14 sp.), Antilles, Guayaquil, and Galapagos Islands; Leiolæmus (14 sp.), Peru to Patagonia; Sceloporus (9 sp.), from Brazil to California and British Columbia, and on the east to Florida; Proctotretus (6 sp.), Chili and Patagonia; Phrynosoma (8 sp), New Mexico, California, Oregon and British Columbia, Arkansas and Florida; Iguana (5 sp.), Antilles and South America; Cyclusa (4 sp.), Antilles, Honduras, and Mexico.

Among the host of smaller genera may be noted:—

Brachylophus, found in the Fiji Islands; Trachycephalus and Oreocephalus, peculiar to the Galapagos; Oreodeira, said to be from Australia; Diplolæmus and Phymaturus, found only in Chili and Patagonia; and Callisaurus, Uta, Euphryne, Uma, and Holbrookia, from New Mexico and California. All the other genera are from various parts of Tropical America.

Family 51.—AGAMIDÆ. (42 Genera, 156 Species.)

General Distribution.
Neotropical
Sub-regions.		Nearctic
Sub-regions.		Palæarctic
Sub-regions.		Ethiopian
Sub-regions.		Oriental
Sub-regions.		Australian
Sub-regions.
— — — —— — — —— 2. 3. 41. 2. 3. 41. 2. 3. 41. 2. 3 —

The extensive family Agamidæ—the Eastern representative of the Iguanas—is highly characteristic of the Oriental region, which possesses about half the known genera and species. Of the remainder, the greater part inhabit the Australian region; others range over the deserts of Central and Western Asia and Northern Africa, as far as Greece and South Russia. One genus extends through Africa to the Cape of Good Hope, and there are three peculiar genera in Madagascar, but the family is very poorly represented in the Ethiopian region. Many of these creatures are adorned with beautifully varied and vivid colours, and the little "dragons" or flying-lizards are among the most interesting forms in the entire order. The larger genera are distributed as follows:—