P. sibynus (Jordan, 1925) .

Amealco, 6.24 km W: 1 male, 7/7/1982, ex Peromyscus levipes levipes (082 JCM) ; Camargo: 1 male, 26/2/1983, ex Peromyscus difficilis saxicola (532MQ); Maguey Verde: 1 female, 1 male, 22/5/1983, ex Peromyscus difficilis saxicola (762MQ, 764MQ); Pinal de Amoles, 1 km S: 4 females, 5/7/1982, ex Peromyscus levipes levipes (080 JCM, 080 JCM5) .