. Bulletin. Natural history; Natural history. November, 1961 Smith: Amphibians and Reptiles of Illinois 163 Crotaphytus Holbroolc This strictly North American genus con- tains four species, according to some au- thors, five, according to others. Two or three, the number depending on the point of view of the specialist, species occur in the United States, and one of these is known from the Mississippi River bluffs in Mis- souri but is not known in Illinois. Crotaphytus collaris collaris (Say) Eastern Collared Lizard Agama collaris Say 1823:252 (type locality: Verdigris River near its union with
. Bulletin. Natural history; Natural history. November, 1961 Smith: Amphibians and Reptiles of Illinois 163 Crotaphytus Holbroolc This strictly North American genus con- tains four species, according to some au- thors, five, according to others. Two or three, the number depending on the point of view of the specialist, species occur in the United States, and one of these is known from the Mississippi River bluffs in Mis- souri but is not known in Illinois. Crotaphytus collaris collaris (Say) Eastern Collared Lizard Agama collaris Say 1823:252 (type locality: Verdigris River near its union with the Arkansas River, Oklahoma). Diagnosis.—A large iguanid lizard with a broad head distinctly set off from the body by a narrow neck; tail approximately twice as long as snout-vent length; granular scales above, slightly larger scales below; femoral pores present; a distinct black nuchal collar, which is interrupted medially. Distribution.—A colony of eastern col- lared lizards at Pevely, Missouri, which is on the Mississippi River bluffs opposite Val- meyer, Monroe County, Illinois, was known to Hurter (1897). This population still ex- ists. I have thus far been unable to find the species on the Illinois side of the river, but there is a slight possibility that a small colony may occur somewhere in the Monroe County bluffs. ANGUIDAE Opinion is divided among American her- petologists on the number of anguid genera in the United States, some authors recog- nizing two and others four. The family is predominantly New World in distribution, but a few genera occur in Eurasia and Africa. Ophisaurus Daudin Three species of Ophisaurus, one with two subspecies, occur in the United States. Other species are found in the Old World. The nominate race of the polytypic species occurs over most of Illinois. One other spe- cies may be found in the state, although it is as yet unrecorded here. Ophisaurus attenuatus attenuatus Cope Western Slender Glass Lizard Joint Snake Opheosaurus ventra
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