1905. ] AMPHIBIANS AND REPTILES, 207 
covered and caught by mere accident. For instance, I found one 
single specimen of /7. staufferi at Motzorongo, a species until then 
known only from Guatemala. H. bowcourti of the same country 
has been recorded once from Tepic, none from the enormous 
intervening stretch. H. miotympanum seems to range from the 
Isthmus through the mountainous parts of Vera Cruz, going up 
towards Puebla. H. venulosa is an eastern form, from South 
America to Tampico, decidedly Atlantic, but once recorded from 
near Mazatlan. HH. baudini, the commonest Tree-frog, ranges from 
fcuador right through Central America, and then spreads east and 
west through the hot countries of Mexico, absolutely avoiding the 
plateau, but reaching Texas. 
On July 4, 1902, when the rains were very irregular, we found 
H, baudini spawning, south of Cordoba. On a piece of inundated 
woodland meadow, about the size of a suburban lawn, were 45,000 
frogs at a low computation, two-thirds of them in amplexus, the 
other males making a deafening din. Next day the pool was dried 
up completely, the grass glazed with the spawn, and there was not 
a single frog to be heard or seen in the neighbourhood. 
Hf, copei, known as ‘‘ Sapo blanco” or white toad, is a hill form. 
Known already from Texas, Chihuahua, Guanajuato, and Jalisco, 
I found it plentiful on the whitish calcareous terrain south of 
Chilpancingo, not in the trees but sometimes on rather barren 
and dry fields. Decidedly typical of the western and southern 
plateau and its Pacific slope, and very abundant, is H. eximia. 
Result.—Mexico has many Hylide in common with Central and 
even South America; but the majority are now peculiar to Mexico, 
and only two, H#. cope: and H. baudini, extend northwards into 
Texas. 
CysTiGNATHIDA, like the Hylide, of decidedly South-American 
origin, Of the 15 or 16 genera of this family only Leptodactylus *, 
Paludicola, Syrrhopus, Hylodes*, and Borborocetes occur also in 
Mexico, altogether with some 23 species. Those marked * are also 
Aoneilleen. ‘Not one reaches the United States : ; in fact the most 
northern record is made by H. calcitrans at Zacatecas. B, meai- 
canus is peculiar to the Central plateau and the high mountains of 
Jalisco, Colima, and Guerrero. Of the 9 or 10 species of Hylodes 
6 are restricted to Mexico, but their recorded localities are still 
too few and scattered, The same applies to the six species of 
Syrrhopus ; the others range far south to Nicaragua and Costa 
Rica : H. palmatus is Pacific, HH, melanostictus Atlantic Mexican ; 
HT. rhodopis on either side. The last is the commonest species and 
seems to be an instance of a southerner which, although not going 
on to the plateau itself, ascends the high mountains on its eastern, 
southern, and western borders, e. g. Citlaltepetl up to 10,000 feet, 
Cerro de Oaxaca, Nevado de Colima; it also inhabits the hot low- 
lands of Agua fria in the State of Vera Cruz. Mostly of dark 
brown and reddish tints and living on or near the ground; how- 
ever, some specimens in the epiphytic Tillandsias, or on green 
