RANA. 201 
5. Rana bonaccana, sp.n. (Tab. LX. fig. B.) 
Hab. Mexico, Island of Bonacca, off the coast of Yucatan (Gaumer). 
Form rather robust ; head large ; snout moderately pointed, with very distinct canthus 
rostralis, and high, concave loreal region. Nostril nearer to the end of the snout than 
to the eye. Tympanum as large, or nearly as large, as the eye, and equal to the distance 
of the eye from the nostril. Vomerine teeth in two oblique rows, placed between the 
hinder part of the choane, not close together. First finger but little longer than 
the second when both are adpressed to each other. ‘Toes broadly webbed, only the 
last phalanx of the fourth being free. Only one narrow metatarsal tubercle. Fingers 
and toes with rounded (not dilated or truncated) ends. Hind limb, without tarsus, 
rather shorter than, fourth toe (from metatarsal joint) half as long as, the body. A 
very narrow glandular fold on each side of the back; skin of the upper parts and sides 
covered with minute asperities, of the lower parts smooth. Greyish, irregularly marbled 
with brown and black, the spots on the legs being more or less transverse. Lower parts 
whitish, densely and finely marbled with brown; throat blackish-brown; no black spot 
in the temporal region, but one of oblong shape on the front part of the humerus; and 
a black stripe below the canthus rostralis. 
Several specimens agree in form and coloration; the measurements of an adult 
female are :— 
Distance between snout and vent . . . . . . . . 100 millim. 
Diameter of tympanum. . . . . . . .. 0.0. OQ » 
Length of hind limb to tibio-tarsal joint . . . . . . 89 ” 
Distance from heel to end of foot . . . . . . . . OS ” 
” of metatarsal joint from end of fourth toe . . 51 ,, 
Neither &. clamitans nor R. draytonii has so angular a canthus rostralis or so broad 
a forehead as this species. 
6. Rana maculata. 
Rana maculata, Brocchi, Miss. Sc. Mex., Batr. p. 13, t. 3. figg. 2, 2 a-c. 
Hab. Guatemaa, Totonicapam (Locourt). 
Form robust; head of moderate size; snout short and moderately pointed; canthus 
rostralis distinct. Tympanum two-thirds the size of the eye. Vomerine teeth in two 
oblique groups between the hinder part of the choane. The two inner fingers nearly 
of the same length. ‘Toes broadly webbed, the membrane extending to the penultimate 
phalanx of the fourth toe. A small inner metatarsal tubercle. Skin smooth (dorsal 
glandular folds apparently but little developed). Upper parts greenish-olive, with 
rather small, rounded black spots; hind limbs banded. Temple with a black band 
from the eye to behind the tympanum. 
