Zweifel Aug 4, 1950 If a stone is thrown near one of the foraging Cnemidophorus tigris oethops, the lizard takes off after it at a great rate and does his stupid best to cough it down. Holbrookia maculata and Urosaurus ornatus were also collected at this locality. An LOR Coluber flagellum queens was found at 8:00 AM 47 miles N of Guaymas, 0.1 mile farther on a DOR Chionactis. Micrurus [illegible] (seems to be "palm" previously not been recorded north?) of Mazatlan A DOR Hypsiglena chlorispha was collected 3.3 miles further on. In Guaymas we visited the "Instituto Pesca" and then went back to Borochimpo [illegible] where we swam, drank beer, and tagged specimens for about three hours before moving on. Our next stop was a camp about four miles past C. Oregon. Nothing spectacular happened here. Aug. 5, 1950 The road is paved for about 52 miles past Empalme. Our next stop was at a wash 12.9 mi NW of Navajon. Here we collected Cnemidophorus sarabii, Urosaurus