Abstract
Reproduction was studied in a mountain population of the lizard Uta stansburiana hesperis situated at 1585-1829 m in the San Gabriel Mountains of southern California. Lizards were active 12 months of the year. Oviducal eggs were present from 12 April-1 August. Females laid a maximum of 3 clutches containing 1-6 eggs during 1974. Average clutch size was 3.5 eggs. Spermiogenesis began during November at 1829 m, was delayed until January at 1585 m and concluded during early August. Hatchlings appeared in early July; some of them reached adult size (42 mm SVL) by September. Fat bodies underwent a seasonal cycle showing enlargement in both sexes in autumn and in females during February-March prior to yolk deposition for clutch 1. It is postulated that winter activity allowed females to begin yolk deposition early enough to produce 3 egg clutches.
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