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In southern New Mexico, males of Holbrookia maculata, H. texana, and Phrynosoma modestum were reproductive from at least May through July; male Crotaphytus collaris were reproductive only in May and June. The latter apparently had a short breeding season and produced a single clutch (x̄=5.3 ± .35 eggs). All-female Cnemidophorus tesselatus were gravid from late May to mid-July, and possibly produced more than one clutch. Males of Cnemidophorus tigris were reproductive for 5 months in Arizona, 4 months in New Mexico, and 3 months in Utah. Oviducal eggs had a similar pattern of 3, 2, and 1 month respectively. Clutch size followed previously described trends, averaging 4.0 ± .42 in Utah and 2.03 ± .12 in New Mexico. Abdominal fat bodies in females of Crotaphytus collaris, Sceloporus graciosus (Utah), Cnemidophorus tesselatus and Cnemidophorus tigris decreased in length during …