collared lizard

GNU Webster's 1913

1. n. any of several species of lizards of the genus Crotaphytus and the family Iguanidae, of the central and western U.S. and northern Mexico, having long tails and usually bearing markings on the neck appearing like a collar of two black bands.

WordNet 3.0

1. n. any of several robust long-tailed lizards with collars of two dark bands; of central and western United States and northern Mexico