Murrey 1948 Cnemidophorus tessellatus May 18. Juinifo, 1700 ft., Baja California Shot 1 today and have found them quite common around here. This is a canyon with a sandy wash and dense growths of ramajo ceniza and other bushes. Mesquites are scattered about. Rolling rocky hills are all around with dry brush, mostly limboi. Several live along brush fences and may be chased a long way up them, the lizard rushing several feet at a time and feringly breaking out across open ground to a bush. A few appeared on the hillside. I have shot at several only to have them run rapidly for cover with a resounding crash, being very large. The one taken today behaved in this manner, as though untouched, but I found him about 10 feet away in a small hole in the bank, shot enough to knock over most lizards and by then very weak. When undisturbed, these walk most of the time or make an occasional short rush. They often bob their heads and seem to poke them into leaves or bushes with jerky movements, perhaps searching for food. Their heads seems to be characteristically held at