Mayhew 1961 June 8 Journal Mexico - Arizona - Calif. Trip Uma notata - 21 (18 more released) Uta weaveri - 4 Dipsosaurus dorsalis - 9 Crotaphytus collaris - 4 Crotaphytus wislizeni - 2 Urosaurus graciosa - 12 Sceloporus orcutti - 1 Xantusia henshawi - 28 Colonyx variegatus - 33 Saurornalus obscus - 6 Callisaurus draconoides - 4 I was impressed with the relatively small number of animals and tracks seen in the Gran Desierto in Sonora, & in the portions of Baja California that we visited. The same was true for the parts of Arizona that we covered. The lack of animals (Reptilia) that were seen might be explained by the fact that we were looking at the wrong time of the day. However, the tracks should have been visible at any time of day. Bird, insect & mammal tracks were seen at times when few, if any, reptile tracks were seen. No place visited compared with the Algodones Dunes for numbers of reptiles or of tracks. This area must be fantastically rich with reptiles.