R. Zweifel 1953 Holbrookia texana Rio Nazas at San Salvador, Durango, Mexico July 6 236288 - chest yellow, throat gray centrally with lighter spots in the periphery. Lateral belly area gray. Sides of body with rust colored spots oriented in vertical lines. 236328 lateral ventral area from axilla 1/2 way to groin is bright orange. Center of throat orange, periphery grey, lighter spotted. Lizards were in sandy areas away from the river proper. Surrounding country is mosquito - arctillo desert.