Duration of attachment was determined for the mites Neotrombicula californica and Geckobiella texana and the tick Ixodes pacificus on the iguanid lizards Sceloporus graciosus and Uta stansburiana from southern California. Neotrombicula californica infestations lasted approximately 1 wk. Attachment of Ixodes pacificus larvae and nymphs lasted approximately 8 days on S. graciosus and 16 days on U. stansburiana. Geckobiella texana remained attached to S. graciosus for 5 days and to U. stansburiana for 28 days.