12 University of California Publications in Zoology [ Vou. 17 
depressed; tongue attached to central pedicel only, free in front; 
digits half-webbed, 4-5; costal folds 12; color dark chocolate, mottled 
on back, sides, limbs, feet, tail and chin with gray. 
Material—Two adults from the type locality, as above: nos. 5693 
female, and 5694 male, Mus. Vert. Zool. 
Comparisons.—The free tongue, consolidated premaxillaries, ossi- 
fied parietals, and digits 4-5 place the present species within the genus 
Spelerpes. The half-webbed toes and character of the palatine teeth 
relate it more closely to the Mexican alpine forms of that genus than 
to those of the tropical and austroriparian regions of North America. 
In number of costal folds and style of coloration (see Broechi, 1882, 
pl. 19), it resembles S. leprosus Cope (1869, pp. 105-106), described 
from the ‘‘ Alpine region, in Vera Cruz, Mexico.’’ But it is distinct 
from leprosus because of its wider and longer head and shorter tail 
(see table of measurements). 
MEASUREMENTS IN MILLIMETERS OF SPELERPES 
S. platycephalus 
A 
no. 5693 ° 
no. S. leprosus 
in 5694 as 
alive alcohol 3 (oh 9 6sex?2 
MotallMleng Ghee cere eee 106.5 99.4 86.9 91 105 87 
Tail from posterior angle of vent 35.5 33.6 30.2 45 52 37 
lead! widthy fcc ncecccesceerccretse ese eee Haley) 10.3 10.2 8 9 8 
Snout to gular folde=s 15.3 14.2 12.6 3 —_ 
Slows ose Ll yee eee ee 20.7 18.4 2 ats 15 
STAG) Rea ON Seer ereeriereeersen Seca 54.2 47.8 ee ee 46 
de) cil De oe eseeceeer eee a eee ee ete 16 15.5 15.5 12 14 15 
OS Wes Ul hse 9 yes sec ee ecer cece: Heater 18 17.0 16.9 5) 17 18 
* Boulenger, 1882, p. 68. 
* Cope, 1869, p. 106. 
Description of type-——Parasphenoid teeth in two elongate patches, 
separated by a narrow interval from the palatine teeth which extend 
in two slightly arched series beyond the choanae; head depressed, 
wider than body at any point; no trace of canthus rostralis, subnarial 
protuberances or parotoid glands; naso-labial grooves barely dis- 
tinguishable ; nostrils minute; premaxillaries united, containing a fon- 
tanel; maxillary and mandibular teeth small and numerous, jaws not 
edentulous posteriorly ; body elongate, containing distance from snout 
to gular fold four and one-half times; limbs fail to meet by two costal 
interspaces, when appressed to sides; fore limb forward to middle of 
eye; hind limb forward over five costal folds; fingers and toes slightly 
