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Centruroides franckei, n. sp. and Centruroides rodolfoi, n. sp. are described from Oaxaca, Mexico. These species belong to the "striped" group within the genus. Thirteen species of the genus are reported for the state, six of them belonging to the "striped" group (infamatus-nigrovariatus subgroup). Both new species are compared to their most morphological similar species. A map with the six "striped" (infamatus-nigrovariatus subgroup) species in the state is also provided.

A new species of Vaejovis is described from the Mexican state of Aguascalientes. It is assigned to the "mexicanus" group and compared with similar species from Jalisco, Guanajuato, and San Luis Potosí. A map with their known distributions is provided.

Vaejovis coalcoman sp. n. from Sierra de Coalcomán, in the northwestern part of the state of Michoacán, Mexico, is described. It belongs to the "mexicanus" group and it is compared with related species from the states of Jalisco and Guanajuato. A map with the known distribution of the related taxa is provided.

Taxonomy and systematics Redescription of the velvet worm Oroperipatus eisenii (Onychophora: Peripatidae), through DNA sequencing, scanning electron microscopy and new collection records from Western Mexico Redescripción del gusano terciopelo Oroperipatus eisenii (Onychophora: Peripatidae), a través de secuenciación de ADN, microscopía electrónica de barrido y registros nuevos del occidente de México