Abstract
Mesocestoides larvae are reported from the lizards Gerrhonotus coeruleus ,Sceloporus occidentalis and Eumeces fasciatus: and from the snakes Thamnophis elegans and Crotalus viridis. Adult Mesocestoides variabilis are recorded from the carnivores Vulpes macrotis, Canis latrans and Lynx rufus; also from the opossum Didelphis virginiana, Mesocestoides sp. was found in the small intestine of the fox Urocyon littoralis. All above records are from California. Descriptions of the tetrathyridia are included.

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