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Show 224 DR. H. GADOW ON MEXICAN [June 6, southern half; coloured and behaving exactly like Flaps, it is often mistaken for a true " Coralillo." Urotheca, Dromicus, Drymobms, and Leptophis are mainly Central and South American with species in the Antilles, extending northwards into the Atlantic and Pacific Tierra Caliente, on the east side even into Texas. Drymobms margaritiferus is the commonest tree-snake. D. boddaerti ranges from South America, Trinidad and S. Vincent, and on the Pacific side it has been brought from Tres Marias Islands. Rhadinea is South and Central American, going into Mexico east and west and onto the slopes of the Southern plateau. Urotheca likewise Central and South American and Cuban ; U. elapoicles from Costa Rica along the Atlantic side to Orizaba. Streptophorus typically Central American, extending into the Atlantic Tierra Caliente. S. diadematus from Tabasco through Oaxaca to Jalapa and Orizaba. S. atratus from Ecuador and Venezuela to Jalapa. None is Antillean. Hypsiglena torquata from Venezuela to California, in Mexico on the plateau and the Pacific side. Atractes, Tropidodipsas, Dirosema, and Geophis are Southern genera, extending into the Atlantic and Pacific Tierra Caliente, the last genus with more western range. G. (Geagras) ridimita I have found in the sand-dunes of the lagoons near Tehuantepec. O p i s t h o g l y p h a .-Trimorphodon, a Mexican genus with western preference. T. upsilon extending northwards into Arizona, southwards to Panama ; T. biscutatus distinctly Pacific from Mazatlan to Panama ; T. tau on the Isthmus of Tehuantepec. Hiviantodes, a typical Neotropical forest genus, of which //. cenchoa has spread into the Atlantic, II. gemviistrata and H. tenuissima into the Pacific Tierra Caliente. Cope's statement that II. gemmistrata has been found at Toluca seems to be erroneous. These Tree-snakes are called " Suchil " in Oaxaca and on the Isthmus, are feared as poisonous, and are said to attain a very great length. Every snake, when in motion, appears to be much longer than it is, and these active creatures gliding rapidly through the dense canopy of a tropical forest seem indeed to give one the impression of prodigious length. Another name for Tree-snakes is " Bejuquillo," in allusion to lianas, which are called bejuco. Leptodira, Neotropical, into the eastern and western Tierra Caliente, remaining outside the plateau, although L. albofusca, which extends to Para and Ecuador, ascends outlying mountains, like the Nevado de Colima, up to 7000 feet. L. septentrionalis, as the most northern offshoot, occurs in Texas and New Mexico. Oxyrhopus, essentially South and Central American ; 0. cloelia and O.plumbeus stop at the Isthmus of Tehuantepec ; 0. petiolarius goes into Guerrero. This genus is of special interest since it contains the only Opisthoglyph which has reached the Antilles, but only the Lesser. |