RANA. 199 
Head of moderate size, with the snout rather pointed. Tympanum nearly the size 
of the eye. Vomerine teeth between and not touching the choane, in two short more 
or less transverse series. The first finger extends beyond the second. Toes with the 
web distinctly emarginate and not extending to the tips. Only one (the inner) 
metatarsal tubercle, which is very small. Hind limb, without tarsus, as long as, fourth 
toe (from metatarsal joint) three-fifths of the length of, the body. Back with a narrow 
glandular fold on each side. Olive, or greenish or brownish above, with oval or 
rounded blackish spots edged with lighter; legs with cross-bars. 
Male with small internal vocal sacs which may be accompanied by a dilatation of the 
outer skin. 
Many specimens exhibit what is termed an external vocal sac: this is shown by an 
ovate space of the skin of greater or less extent above the shoulder-joint being dilated, 
thin, and rugose ; it admits of a greater distension of the vocal sac proper, which is 
present in all male specimens. A number of adult male individuals show no such 
modification of the outer skin, and for them the specific name “halecina” has been 
retained, while the others have been distinguished as Rana utricularia. I cannot 
discover any other constant distinctive character; and observing that male specimens 
from the same locality and of nearly the same size may or may not have this modification 
of the outer skin, I am disinclined to admit it as a specific distinction. 
Brocchi (Miss. Sc. Mex., Batr. p. 12, t. 3. figg. 1, 1 ac) describes and figures a 
Rana macroglossa from Guatemala. Until the typical specimen is re-examined and 
redescribed, it is not possible to form an opinion as to this frog. The figure certainly 
does not assist. According to the description this frog would be characterized by 
having a tympanum of about half the extent of the eye, but in the figure it is represented 
of the same size as in &. halecina. The two inner fingers, stated to be unequal in length, 
are represented as equal in the special figure (1@). No vomerine teeth whatever are 
shown in fig. 1c, and the tongue, “ légérement échancrée en avant,” is figured as pointed 
in front, &c. 
3. Rana forreri. (Tab. LX. fig. A.) 
Rana forreri, Bouleng. Ann. & Mag. N. H. 1883, xi. p. 343. 
Hab. Mexico, Presidio de Mazatlan and Ciudad in Durango (orrer). 
Head of moderate size, with the snout rather pointed; canthus rostralis rather 
obtuse, the loreal region slanting outwards and slightly concave. Vomerine teeth in 
two short, scarcely oblique series, between the choane *. The first finger is very little 
longer than the second when both are adpressed to each other. Toes with the web 
* In the typical example they extend a little behind the choane ; but this is not always the case, as in two 
of the specimens from Ciudad, which, however, are referred to R. halecina in the Natural History Museum. 
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