The Amphibians and Reptiles of Sinaloa, Mexico - Smithsonian ...

182 UNIVERSITY OF KANSAS PUBLS., MUS. NAT. HIST.
out the year; specimens were collected in every month. Phyllomedusa
dacnicolor and Hyla smithi have been found in stomachs.
These snakes are extremely wary; when captured they will expand
their neck vertically, thereby displaying blue skin. The mouth is
held wide open and the head moved from side to side. When the
snakes bite they imbed their rear fangs in a fast chewing movement.
A mild sting, attributed to poison, persists for some time at the
location of the bite. A specimen collected on August 1 and two
taken August 10 exhibit umbilical scares and are presumably
hatchlings.
Distribution in Sinaloa.—Throughout the state below about 2000
meters. See Fig. 73.
Specimens examined,—9.6 km. NE El Fuerte ('KU 77977); 9.4 mi. S
Escuinapa (LACM 6977); Isla Palmito del Verde, S end (* KU 73566, 73651);
Labrados (CAS 64975); La Cruz (LACM 6970-71); Mazatlan ("KU 63425;
LACM 6972, 6980; UAZ 16300); 4 mi. N Mazatlan (LACM 6969); 6.8 mi. N
Mazatlan (UAZ 16301); 8 mi. N Mazatlan (LACM 6974); 42 mi. NW Mazatlan
(JRM 1101); Plomosas, 760 m. ('KU 73563-65); Rosario, 150 m.
(•KU 73559-62; LACM 6975); Rosario, Rfo (JFC 62:50); 30 mi. N Rosario