196 DR. H, GADOW ON MEXICAN [June 6, 
Contia nasus. Contreras. 
Zamenis mentovarius. San Mateo, Tequesixtlan. 
35 mexicanus. Rio Balsas, Cocoyul. 
3 pulcherrimus. Salina Cruz. 
3 lineatus. Tguala. 
Coluber eorais. La Raya; Tequesixtlan; Ayutla. 
Coronella micropholis, var. B. Chilpancingo, San Luis Allende. 
Urotheca elapoides. La Raya. 
Drymobius margaritiferus. fotzorongo, Agua fria, San Juan Evangelista. 
3 boddaerti. Motzorongo, La Raya. 
Leptophis mexicana. Motzorongo, La Raya. 
* diplotropis. San Mateo del Mar. 
Rhadinea decorata. Presidio. 
Hi clavata. Tetela. 
Ws vittata. La Raya, Salina Cruz, Tequesixtlan, Totolapan ; 
Omilteme, Chilpancingo. 
Streptophorus atratus. Presidio, Motzorongo, La Raya. 
Geophis semidoliatus. Orizaba. 
Geagras redimitus. San Mateo del Mar. 
Trimorphodon upsilon. Cuernavaca, Rio Balsas. 
is biscutatus. Tierra Colorada. 
Himantodes cenchoa. La Raya. 
Tieptodira personata. Rio Balsas, Ayutla. 
45 albofusca. Cocoyul, San Luis ; Nevado de Colina. 
A guilleni. Rio Balsas. 
Conophis vittata. Salina Cruz, Tequesixtlan. 
Homalocraniwm miniatum. Tezonapan, N. of Ayutla. 
Manolepis putnami. Los Cajones. 
Petalognathus nebulatus. La Raya. 
Dryophis acuminatus. Motzorongo. 
laps fulvius. La Raya, San Juan Evangelista. 
Lachesis lanceolatus. Motzorongo, La Raya. 
»  atroaw. Motzorongo. 
Crotalus terrificus. Tequesixtlan. 
43 triseriatus. Citlaltepetl, 9000-12,500’ ; Nevado de Colima. 
PuysicAL FEATURES. 
A list of the names of the localities where collections have 
been made should be supplemented by @ 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 informa- 
tion. For instance, 2000 feet on the Atlantic slope means typical 
tropical hot-country vegetation, while on the Pacific side (¢. 9. 
Oaxaca and @uerrero) 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 
