R. Zweifel 1953 Journal June 23 Samalayuca, Chihuahua, where we camped in the sand dunes. No snakes were seen on the 37 miles of night driving to our campsite. Bright moon- light again. June 24 Collected 6 Cnemidophorus tigris in the sand dunes at our campsite before driving south to Chihuahua again. The ride from Guarez is monotonous in the extreme. Sometimes Yanea desert, most mostly just overgrazed country which shows little to indicate what it might look like under native conditions. Several Phrynosora cornutum were seen on the highway and one secured by the simple expedient of running over its head. This was 22 mi N Ahumada. The only snake seen was a DOR Mastrophis flagellum (not saved) at 5 miles S Ahumada. A Sceloporus undulatus was found in a well at a roadside park 14 mi NNE Chihuahua. After stopping in Chihuahua city to pick up mail, we drove west along the road to Cuantémoc (San Antonio on older maps). There is a new paved highway extending the 105 km from Chihuahua to Cuantémoc. Beyond that point a fairly well graded dirt road takes over.