An annotated checklist of the type specimens in the Herpetological Collection of the Escuela Nacional de Ciencias Biológicas (ENCB, I. P. N.), Mexico, is provided, which includes 6 holotypes and 37 paratypes of 6 species and 2 subspecies: Pseudoeurycea boneti Álvarez and Martín, 1967 (holotype); Bipes caniculatus multiannulatus Álvarez, 1966 (holotype, 23 paratypes); Dipoglossus legnotus Campbell and Camarillo-R., 1992 (holotype); Sceloporus torquatus mikeprestoni Smith and Álvarez, 1976 (8 paratypes); Anolis alvarezdeltoroi Nieto-Montes de Oca, 1996 (holotype); Lepidophyma chicoasensis Álvarez and Valentín, 1988 (holotype, 3 paratypes); Lepidophyma lowei Bezy and Camarillo-R., 1997 (2 paratypes); and Lepidophyma tarascae Bezy, Webb and Álvarez, 1982 (holotype, 1 paratype).