104. AMPHIBIA—HYLIDA. 
ponds in order to copulate, the male seizing the female just behind the 
arms. A short time after he noticed the pond to contain a great number 
of dead animals, which he explains on the supposition that the males 
while mounted upon the females, pressed the latter under water so long 
as to cause death from drowning, and this view was corroborated by his 
finding, in some cases, the male still clasping the dead female. 
DIN MENA NE Let NC Uy EID apg AU es I Jt | tO) AN ID) IS) 
Head short; parotoids none; tongue attached in front, free and usually notched 
behind; ear well developed, with s distinct tympanum; maxillary and vomero-pala- 
tine teeth present in upper jaw; abdominal integument areolate, or with tubercular 
granulations; toes palmate, with the tips of the digits dilated, forming disks or pellets ; 
vertebra procelian; sacral diapophyses dilated or undilated ; arboreal or aquatic. 
This family are most abundant in the Neotropical, but absent from the Ethiopian 
region, and our North American genera may be divided as follows: 
*Toes distinct or slightly webbed at base; fingers nearly or quite distinct; disks 
small. : : Bl are ‘ : . 6 : ; : 6 5 CHOROPHILUS, 
* Toes webbed nearly to tips; fingers nearly or quite distinct; disks small. Acnis. 
* Toes prominently webbed ; fingers partially palmate; disks large; body often short 
and thick. : : s ; ; : 6 . 6 6 5 : : HYLA. 
GENUS CHOROPHILUS. Baird. 
Body slender and very delicate, smooth or granulated above ; tongue nearly orbicular, 
emarginate behind ; vomerine teeth posterior to or between the inner nares ; fingers and 
toes distinct or with basal web reaching to phalanges; tips slightly dilated; sacral 
diapophyses expanded ; males with a vecal vesicle, vomerine teeth between the inner 
nares; skinabove granulated. . . . . . ale PDR C. TRISERIATUS. 
Vomerine teeth posterior to inner nares; skin above smooth or warty, not granu- 
lated ; web entirely wanting between the two outer toes; color above black, with spots 
or stripes. : ; : ; : : 6 6 : 4 6 5 ©. NIGRITUS. 
CHOROPHILUS TRISERIATUS Wiedman. 
Little Wree Frog. 
Hyla triseriatus, MAX. PRINZ von WIEDMAN. 
Helocetes triseriatus et feriarum, BAIRD. 
Chorophilus triseriatus, JORDAN, COPE. 
General color above, bluish ash to black, with a vertebral and two lateral lines, often 
with five distinct stripes in front; spots wanting, or present only upon the head; femur 
about as long as, or somewhat shorter than, the tibia; toes with a slight trace of web 
at the base of each; second toe very long, fifth short; hind legs long, about two and a 
half to three times the anterior; skin granulated above and below, without warts; 
vomerine teeth in two elevated circular patches, between the inner nares. 
Length, l inch; hind leg, 18 inches; head to axilla, 5 lines; transverse diameter of 
head, 2+ lines; vertical diameter of head, 12 lines; transverse diameter ef body, 3 
lines. 
