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Show 1 9 6 DR. H. GADOW ON MEXICAN [June 6, Contia nastis. Zamenis mentovarius. „ mexicanus. „ pulcherrimus. „ lineatus. Coluber corais. Coronella micropholis, var. B. Urotheca elapoides. Drymobius margaritiferus. „ boddaerti. Leptopliis mexicana. „ diplotropis. EJiadinea decorata. „ clavata. „ vittata. Streptophorus atratus. Geophis semidoliatus. Geagras redimitus. Trimorphodon upsilon. „ biscutatus. TLimantodes cenchoa. Leptodira personata. „ albofusca. „ guilleni. Conophis vittata. TLomalocranium miniatum. Manolepis putnami. Petalognathus nebulatus. Dryophis acuminatus. JSlaps fulvius. Lachesis lanceolatus. „ atrox. Crotalns terrificus. ,, triseriatus. Contreras. San Mateo, Tequesixtlan. Rio Balsas, Cocoyul. Salina Cruz. Iguala. La Raya; Tequesixtlan; Ayutla. Chilpancingo, San Luis Allende. La Raya. Motzorongo, Agua fria, San Juan Evangelista. Motzorongo, La Raya. Motzorongo, La Raya. San Mateo del Mar. Presidio. Tetela. La Raya, Salina Cruz, Tequesixtlan, Totolapan ; Omilteme, Chilpancingo. Presidio, Motzorongo, La Raya. Orizaba. San Mateo del Mar. Cuernavaca, Rio Balsas. Tierra Colorada. La Raya. Rio Balsas, Ayutla. Cocoyul, San Luis ; Nevado de Colina. Rio Balsas. Salina Cruz, Tequesixtlan. Tezonapan, N. of Ayutla. Los Cajones. La Raya. Motzorongo. La Raya, San Juan Evangelista. Motzorongo, La Raya. Motzorongo. Citlaltepetl, 9000-12,500'; Nevado de Colima. P h y s ic a l F e a tu r e s . A list of the names of the localities where collections have been made should be supplemented by a short description of the chief physical features; without these it is of no more use than the bare mentioning of the name of the political country. The " altitude " is supposed to be all-sufficient; but this is a great mistake, since it conveys nothing without further information. For instance, 2000 feet on the Atlantic slope means typical tropical hot-country vegetation, while on the Pacific side {e.g. Oaxaca and Guerrero) the same elevation implies pine- and oak-forests, with a character devoid of tropical fauna and flora. Mexicans divide their country into the Tierra Caliente, Templada, and Fria, with a hot, temperate, and cool climate respectively; the Tierra Templada corresponding on an average with an elevation of 3000 to 5000 feet. But the natives of the State of Vera Cruz draw the imaginary line at a level very different from that used by the citizens of Puebla. Chilpancingo, 4100 feet, in Guerrero, has a much cooler climate, with nothing tropical about its vegetation, than Oaxaca, 5060 feet, or even Orizaba at 4027 feet, which is in many respects subtropical. Valley of Mexico, 7600 feet. Alluvial; swampy meadows to west and south. Lake Texcoco brackish. Lakes Chaleo and |