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FAMILY 48.—ACONTIADÆ. (3 Genera, 7 Species.)
This small family of snake-like Lizards has a very curious distribution, being found in South and West Africa, Madagascar, Ceylon, and Ternate in the Moluccas. Acontias (4 sp.), is found in the four first-named localities; Nessia (2 sp.), is confined to Ceylon ; Typhloscincus (1 sp.), to Ternate.
FAMILY 49.-GECKOTIDÆ. (50 Genera, 200 Species.)
The Geckoes, or Wall-Lizards, form an extensive family, of almost universal distribution in the warmer parts of the globe ; and they must have some exceptional means of dispersal, since they are found in many of the most remote islands of the great oceans, -as the Galapagos, the Sandwich Islands, Tahiti, New Zealand, the Loo-Choo and the Seychelle Islands, the Nicobar Islands, Mauritius, Ascension, Madeira, and many others. The following are the larger and more important genera :
Oëdura (3 sp.), Australia; Diplodactylus (8 sp)., Australia, South Africa, and California; Phyllodactylus (8 sp.), widely scattered in Tropical America, California, Madagascar, and Queensland ; Hemidactylus (40 sp.), all tropical and warm countries; Peropus (12 sp.), the Oriental region, Papuan Islands, Mauritius, and Brazil; Pentadactylus (7 sp.), Oriental region and Australia ; Gecko (12 sp.), Oriental region to New Guinea and
North Australia ; Gehyra (5 sp.), Australia, New Guinea and Fiji Islands ; Tarentola (7 sp.), North Africa, North America, Madeira, Borneo, South Africa ; Phelsuma (6 sp.), Madagascar, Bourbon, and Andaman Islands; Pachydactylus (5 sp.), South and West Africa, and Ascension Island; Sphærodactylus (5 sp.), the Neotropical region; Naultinus, (6 sp.), New Zealand; Goniodactylus (5 sp.), Australia, Timor, South America and Algiers; Heteronota (4 sp.), Australia, Fiji Islands, New Guinea and Borneo; Cubina (4 sp.), the Neotropical region ; Gymnodactylus (16 sp.), all warm countries except Australia; Phyllurus (3 sp.), Australia ; Stenodactylus (4 sp.), North and West Africa, and Rio Grande in North America.
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.)
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 (1+ sp.), Antilles, Guayaquil, and Galapagos Islands; Leiolamus (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.)
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:
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Draco (18 sp.), the Oriental region, excluding Ceylon; Otocryptis (4 sp.), Ceylon, North India, Malaya; Ceratophora (3 sp.), Ceylon; Gonyocephalus (8 sp.), Papuan Islands, Java, Borneo, Pelew Islands; Dilophyrus (7 sp.), Indo-Malaya and Siam ; Japalura (6 sp.), Himalayas, Borneo, Formosa, and Loo Choo Islands; Sitana (2 sp.), Central and South India and Ceylon; Bronchocela (3 sp.), Indo-Malaya, Cambodja, and Celebes ; Calotes (12 sp.), Continental India to China, Philippine Islands; Oriocalotes (2 sp.), Himalayas ; Acanthosaura (5 sp.), Malacca and Siam; Tiaris (3 sp.), Andaman Islands, Borneo, Philippine and Papuan Islands; Physignathus (3 sp.), Cochin-China and Australia; Uromastix (5 sp.), South Russia, North Africa, Central India; Stellio (5 sp.), Caucasus and Greece to Arabia, High Himalayas and Central India ; Trapelus (5 sp.), Tartary, Egypt, and Afghanistan ; Phrynocephalus (10 sp.), Tartary and Mongolia, Persia and Afghanistan ; Lophura (2 sp.), Amboyna and Pelew Islands; Grammatophorus (14 sp.), Australia and Tasmania; Agama (14 sp.), North Africa to the Punjaub, South Africa. The remaining genera each consist of a single species. Eight are peculiar to Australia, one to the Fiji Islands, one to the Aru Islands, three to Ceylon, five to other parts of the Oriental region, one to Persia, and one to South Russia.
FAMILY 52.-CHAMÆLEONIDÆ. (1 Genus, 30 Species.)
The Chamæleons are an almost exclusively Ethiopian group, only one species, the common Chamæleon, inhabiting North Africa and Western Asia as far as Central India and Ceylon. They abound all over Africa, and peculiar species are found in Madagascar and Bourbon, as well as in the Island of Fernando Po.
General Remarks on the Distribution of the Lacertilia. The distribution of the Lacertilia is, in many particulars, strikingly opposed to that of the Ophidia. The Oriental, instead of being the richest is one of the poorest regions, both in the number of families and in the number of peculiar genera it contains; while in both these respects the Neotropical is by far the richest. The distribution of the families is as follows:
The Nearctic region has 7 families, none of which are peculiar to it; but it has 3 peculiar genera—Chirotes, Ophisaurus, and Phrynosoma.
The Palæarctic region has 12 families, with two (Ophiomoridæ and Trogonophidæ, each consisting of a single species) peculiar; while it has 6 peculiar or very characteristic genera, , Trogonophis in North Africa, Psammodromus in South Europe, Hyalosaurus in North Africa, Scincus in North Africa and Arabia, Ophiomorus in East Europe and North Africa, and Phrynocephalus in Siberia, Tartary, and Afghanistan. We have here a striking amount of diversity between the Nearctic and Palæarctic regions with hardly a single point of resemblance.
The Ethiopian region has 13 families, only one of which (the Chamæsaurida, consisting of a single species) is altogether peculiar; but it possesses 21 peculiar or characteristic genera, 9 belonging to the Zonuridæ, 2 to the Sepidæ, 7 to the Geckotidæ, and 3 to the Agamidæ.
The Oriental region has only 8 families, none of which are peculiar; but there are 28 peculiar genera, 6 belonging to the Scincidæ, 1 to the Acontiadæ, 5 to the Geckotidæ, and 16 to the Agamidæ. Many lizards being sand and desert-haunters, it is not surprising that a number of forms are common to the borderlands of the Oriental and Ethiopian regions; yet the Sepidæ, so abundant in all Africa, do not range to the peninsula of India ; and the equally Ethiopian Zonuridæ have only one Oriental species, found, not in the peninsula but in the Khasya Hills. The Acontiadæ alone offer some analogy to the distribution of the Lemurs, being found in Africa, Madagascar, Ceylon, and the Moluccas. The Australian region has 11 families, 3 of which are pecu