Listed below are thirteen species that have not been found in southern
El Peten but that probably occur there.
=_Dermophis mexicanus mexicanus_= (Dumeril and Bibron).--Natives
at Chinaja know caecilians, which they call _dos cabezas_.
This species has been taken in Tabasco and northern Chiapas.
Its occurrence in southern El Peten is expected. Less likely,
the caecilian known to the natives at Chinaja is _Gymnopis
oligozona_, which is known from Finca Volcan on the southern
slopes of the valley of the Rio Cahabon in Alta Verapaz.
=_Gastrophryne elegans_= (Boulenger).--This small fossorial frog
is known from Piedras Negras (Taylor and Smith, 1945:604), 12
miles east of Yaxha (Stuart, 1934:7), and Tikal (Stuart,
1958:18), all in northern and central El Peten. Two specimens
in the collection of the University of Kansas are from 28
kilometers northeast of Campur, Alta Verapaz. Probably the
species ranges throughout the forested lowlands of northern
Alta Verapaz and El Peten.
=_Mabuya brachypoda_= Taylor.--The absence of this widespread
lizard in our collections cannot be explained. Probably it
occurs in southern El Peten, for it is known in northern and
central El Peten and in Alta Verapaz.
=_Dendrophidion vinitor_= Smith.--This snake is known from
Piedras Negras, El Peten and from various localities in Alta
Verapaz; it is an inhabitant of humid forest and should occur
in southern El Peten.
=_Elaphe triaspis mutabilis_= (Cope).--The subspecies _E.
triaspis mutabilis_ is known from Alta Verapaz and _E.
triaspis triaspis_ from the Yucatan Peninsula, British
Honduras, and Uaxactun in northern El Peten. Because of the
much higher degree of resemblance between the faunas of
southern El Peten and Alta Verapaz as compared with southern
El Peten and Yucatan, _E. triaspis mutabilis_ would be
expected to occur in southern El Peten.
=_Ninia diademata nietoi_= Burger and Werler.--This snake is
known from Tikal and from Alta Verapaz; it is a small
cryptophile that probably occurs in southern El Peten.
=_Oxyrhophus petola aequifasciatus_= Werner.--This snake, which
probably is conspecific with _Oxyrhophus baileyi_ in southern
Veracruz, Mexico, is known from Tikal, British Honduras, and
Alta Verapaz; it is expected in southern El Peten.
=_Pliocercus elapoides salvini_= Mueller.--This species is
widespread in the Atlantic lowlands of southern Mexico and
northern Central America; the subspecies _P. elapoides
salvini_ occurs in Alta Verapaz and probably in southern El
Peten.
=_Rhadinaea decorata decorata_= (Guenther).--This is another
small cryptophile that is widespread on the Atlantic lowlands
from Mexico to Panama; it definitely is expected at places
like Chinaja in southern El Peten.
=_Scaphiodontophis annulatus_= (Dumeril and Bibron).--Three
subspecies of _Scaphiodontophis annulatus_ are recognized in
northern Central America: _S. annulatus annulatus_ from Alta
Verapaz, _S. annulatus hondurensis_ from northern Honduras,
and _S. annulatus carpicinctus_ from Piedras Negras and Tikal
in El Peten and from British Honduras. This rare and highly
variable species probably occurs in southern El Peten.
=_Tantilla schistosa schistosa_= (Bocourt).--This widespread
species in Central America is known from several localities in
Alta Verapaz and almost certainly occurs in southern El Peten.
=_Tropidodipsas sartori sartori_= Cope.--This fossorial species
has been collected in northern El Peten and in Alta Verapaz.
The natives at Chinaja described to me a _coral_ having orange
rings on a black body that likely was this species.
=_Micrurus elegans veraepacis_= Schmidt.--This species has been
collected at various localities in Alta Verapaz and in
Chiapas, inhabits areas like those in southern El Peten, and
probably occurs there.