Abstract
The snakes of the genus Gyalopion are distributed from the southern United States to Zacatecas and Nayarit. In addition to the standard morphological characters usually utilized in snake systematics, I examined measurements of head plates, dorsocaudal scale reduction, subcaudal scale fusions, place of origin of the hemipenial retractor muscle, and many new characters of the hemipenis, skeleton, and scutellation. The genus Gyalopion has the rostral in contact with the prefrontals and the retractor muscle originates near the terminus of the tail. Gyalopion quadrangularis has internasals and an entire anal plate and is distributed in the lowlands of western Mexico and Arizona from southern Arizona southward into Nayarit. Gyalopion canum has internasals and a divided anal plate and is distributed from southern Arizona and New Mexico, southward through southern Texas and the Mexican plateau to Durango and San Luis Potosi. Gyalopion atavus is removed from the genus Gyalopion, and synonymized with Conopsis nasus. Females of Gyalopion canum have hemipenes. Hemipenial muscles without hemipenes are
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