sebae (Dumeril, Birbron y Dumeril 1854) N X Oxybelis aeneus (Wagler 1824) N X X
Pituophis lineaticollis (Cope 1861) N Pliocercus elapoides Cope 1860 N X Pseustes poecilonotus (Gunther 1858) N Rhadinaea decorata (Gunther 1858) N X R.
maculata was similar to that reported by Goldberg & Parker (1975) for two colubrid snakes, Masticophis taeniatus and
Pituophis catenifer.
When searching for distant prey (e.g., [greater than]120 cm; Eichholz and Koenig, 1992), gopher snakes (
Pituophis catenifer) preferentially climb trees with active nests where breeding western bluebirds (Sialia mexicana) provision their nestlings.
Funnel traps were first described by Imler (1945) in his effort to control populations of bullsnakes (
Pituophis sayi) and have since been modified to reduce cost (Hall, 1967), and for use in capturing aquatic (Calef, 1973; Casazza and Wylie, 2000) and arboreal species (Vogt, 1987).
margaritiferus was similar to that reported by Goldberg & Parker (1975) for two colubrid snakes, Masticophis taeniatus and
Pituophis catenifer.
Bullsnakes (
Pituophis melanoleucus says) and prairie rattlesnakes (Crotalus viridis viridis) were occasionally sighted in the shelterbelts.
We observed Crotaphytus nebrius and
Pituophis catenifer as high as 1,978 m and 1,856 m elevation, respectively, and Crotalus cerberus as low as 1,182 m elevation.
Testicular histology was similar to that reported by Goldberg & Parker (1975) for two colubrid snakes, Masticophis taeniatus and
Pituophis catenifer (= P.
Species that were associated primarily with grasslands were: Gastrophryne olivacea, Pseudacris triseriata, Ophisaurus attenuatus, Lampropeltis triangulum,
Pituophis cantenifer, Tantilla gracilis and Tropidoclonion lineatum.
Testicular histology was similar to that reported by Goldberg & Parker (1975) for the colubrid snakes Masticophis taeniatus and
Pituophis catenifer (= P.
Variation in diet between subspecies was found in the northern water snake (Nerodia sipedon) by King (1993) and the gopher snake (
Pituophis catenifer) by Rodriguez- Robles (1998).
Testicular histology (Table 1) was similar to that reported by Goldberg & Parker (1975) for two colubrid snakes, Masticophis taeniatus and
Pituophis catenifer (= P.
Pituophis - bull snakes