206 DR. H, GADOW ON MEXICAN [June 6, 
Isthmus, B. coccifer and Bb, sternosignatus ; or they extend into 
the Atlantic hot-lands, canaliferus; or along the Western Sierra 
Madre into Jalisco, intermedius, with marmoreus peculiar to 
South-western Mexico; or they go as typical hot-country Toads 
into both the eastern and western Tierra Caliente, marinus, 
valliceps on the Atlantic side from Nicaragua to 'Texas, not on the 
plateau, but recorded from Jalisco and Presidio near Mazatlan ; 
lastly, B. stmus from Panama on to and over most of the Mexican 
plateau. 
3. Northerners, chiefly at home in the South-western United 
States and in the northern half of Mexico, eventuallly extending 
south over the Central plateau: B. punctatus, debilis, compactilis. 
Of the Bufonide which are found in the Greater Antilles all 
are now separate, insular species, except B. marinus, which has 
probably been introduced. 
Hytipa.—The creative centre of this family is decidedly South 
America, Every one of the 14 genera of Hylide is found in 
America, and it is only by the large genus Hyla (incl. the slightly 
modified Mylella) that this family has attained its world-wide 
range with the remarkable exception of the whole Paleeo-tropical 
region. From North-western South America they have spread 
through Central America into the Antilles (about 7 or 8 species, 
mostly peculiar), and through Mexico into North America. 
Concerning Mexico they fall into the following groups :— 
1. Genera peculiar to Mexico: Pternohyla, P. fodiens of 
Presidio near Mazatlan ; Zriprion, 7. petasatus of Yucatan; but 
Diaglena jordant of Ecuador and Corythomantis greeningi of 
Brazil point to the south as the old centre of these peculiar 
Mexicans. 
2. Genera with preponderating numbers of species in Central 
and South America, while comparatively few have reached, or have 
been developed in, Mexico: Phyllomedusa with only P. dacnicolor 
on the Pacific side, Agalychnis callidryas and Nototrema oviferum 
in the Atlantic Tierra Caliente. 
P. dacnicolor is saturated green, often with the same white 
temporary patches or spots as happen so frequently in the 
Australian Hyla cerulea, They were pairing at Rio Balsas in the 
month of June. During the nightly thunderstorms the males 
kept up an incessant noise like the snarling bark of little dogs. 
The couples were sitting in low shrubs or amongst herbs, a foot 
above the ground, overhanging little ditches which led into a dirty 
stagnant pool. During the daytime the ditches were absolutely 
dry. The eggs are very small, very numerous, and of a light 
grass-green colour. 
3. Hyla. About 15 species are recorded from Mexico, to which 
no less than 11 seem to be peculiar, but at least 8 of these have 
hitherto been found in single localities only. Our knowledge of 
the distribution of Tree-frogs is still very defective. Most of them 
inhabit the forest-regions of the Atlantic slope. They are dis- 
