_ but differs in its
somewhat larger size, smaller finger and toe discs, the obsolete
canthus rostralis; the loreal region concave and the choanae larger."
Duellman (1966a:270) compared adults, tadpoles, and mating calls of
_dulcensis_ and _elaeochroa_ and concluded that a single species was
involved.

_Hyla elaeochroa_ can be easily confused with the closely related _Hyla
staufferi_. Although the durations of the calls are similar, the call
of _elaeochroa_ has only about one third the number of pulses per
second, a much lower fundamental frequency, and a lower dominant
frequency than that of _staufferi_. _Hyla elaeochroa_ is larger and has
a less pointed snout than does _staufferi_. Although the skulls of the
two species are similar, that of _elaeochroa_ differs in having broad
palatines and comparatively larger nasals that are truncate anteriorly.
In _staufferi_ the nasal is rounded anteriorly and the palatine is
absent.

_Distribution._--_Hyla elaeochroa_ occurs on the Caribbean lowlands
from western Panama through Costa Rica to eastern Nicaragua, and on the
Pacific lowlands of southeastern Costa Rica and extreme western Panama.
Most localities where it has been collected are below 800 meters, but
the species has been found at two localities above 1000 meters (El
Silencio and Pacuare, Cartago Province) on the Caribbean slopes of the
Cordillera de Talamanca, Costa Rica (Fig. 6).

_Specimens Examined._--Nicaragua: _Zelaya_: El Recreo, UMMZ 79721 (9).

Costa Rica: _Alajuela_: Laguna Monte Alegre, KU 64499. _Cartago_: 2 km E
Chitaria, KU 107058; El Silencio, 14.4 km NE Turrialba, KU 107059-60;
4.6 km ENE Pacuare, KU 64451-75, 64628-37; 4 km S Pavones, KU 64500;
Turrialba (Instituto Interamericano de Ciencias Agricolas), KU 30305-26,
24616-57, 30337-54, 31776-91, 31803, 31807-15, 64413-50, 68283-87
(skeletons), 68390-1 (young), 35042 (eggs), 25207-8 (skeletons), 25221
(skeleton), 41073-83 (skeletons). _Guanacaste_: 2 km E Tilaran, KU
86356-77, 87667-8 (young). _Heredia_: Puerto Viejo, KU 36696, 46466,
64501-17, 68288-91, 68387, 68388-9 (young), 91803 (young), 91688-9,
104134 (tadpoles), 104135 (young), 104354-6 (skeletons); 1.5 km N Puerto
Viejo, KU 64518-23, 68386 (tadpoles); 1 km S Puerto Viejo, KU 84985-6
(skeletons), 87669 (young), 87772-3 (skeletons). _Limon_: Bataan, KU
30327-36; La Lola, KU 64478-98, 68281-2 (skeletons); Los Diamantes, KU
31800-02, 64476-7; Peralta, KU 31816-21; Puerto Limon, KU 31792-99;
Sure