x ‘ 
Gope.] 38 ‘ {May 4, 
This species is one of those forms which is near the boundaries of the fami- 
lies of Hylide and Cystignathide. It agrees with the other species of the 
genus to which I have referred it in essential respects ; ¢. ¢., in the free toes, 
the fronto-parietal fontanelle, and the small and separated prefrontals. The 
last two characters distinguish it from Hylodes to which it bears a super- 
ficial resemblance, as also the terminal phalanges, which lack the trans- 
verse limb of that genus. The sacral diapophyses are but little dilated. 
It is noteworthy that this frog is the first one which presents these charac- 
ters, known from South America, all the species of Chorophilus, five in 
number, being North American. 
22. CyCLORHAMPHUS ANGUSTIPES, Sp, NOv. 
A species of medium size, remarkable for the small extent of the palma- 
tion of the toes. The muzzle is short and rounded, its profile retreating 
backwards to the superior, rather elevated plane. Canthus rostrales obso- 
lete ; nares one-third nearer to the border of the orbit than to that of the 
upper lip. The orbits look somewhat upwards and forwards, the tympanic 
membrane is not visible in the derm, but exists as a small vertically oval 
membrane whose long diameter is one-third the vertical diameter of the 
eye. The skin is everywhere perfectly smooth. The thumb and second 
finger are of equal lengths. The web of the hinder foot is deeply notched, 
the edge marking the middle of the first phalange of the fourth toe ; that 
between the first, second and third toes joining the adjacent longer toe at 
a still lower point. The wrist of the extended fore limb exceeds the end 
of the muzzle, while the heel reaches to the nostril; the tibia equals the 
foot without the tarsus. The choane are larger, and the ostiapharynge: 
very small. The vomerine fascicles are small and close together ; they fill 
the narrow space between the inner borders of the choane. The tongue 
is nearly round, entire, and has the posterior fourth free. 
Rent of head amdapodiy=c5 =: oi. <mi-)- ce iemin eis eine ee 
Length of head to posterior line of tympana........... .011 
Width of head at a es se Weld oelaeneee SOLD 
Lengthvot fone dim), = 5: -.ciopsincic Siecle = ich ee 
ot SPOOL FEUE ATES) ae teceterdelacnenetere aiciie she te eevee tieeeRa OO 
a OF Hil Mima Sa e & score arevetershecoshenevate tclerole «fete Peeeme CO! 
ae Of Him efoOOts sc center rasrens oraciiaerietete tee cette rea ee 
3 OF Dub ais eis ro. seusvetelelers a tokatol epee aeasen ed aon ate neces Se eal 
Color above, dark plumbeous ; below, a light lead color. 
No. 136, from Juliaca ; altitude 12,550 feet. 
The characters which distinguish this species from the C. w@maricus, are, 
the greater length of the limbs, the closer approximation of the choane ; 
the absence of dermal margins to the toes, the absence of cuneiform tuber- 
cle, and the close union of the metatarsal bones in the sole. This arrange- 
ment gives the sole a narrow form, without the expansiveness seen in C. 
emuricus, where the grooves between the metatarsals are distinct. 
