Stopped on the west face of Sierra de l Abra mean the crest along the road. They had removed a lot of flagstone-type rocks from the area and there were many other such rocks scattered around. The soil is black and the whole face was hot. Saw Sceloporus variabilis(?) in the trees and on the ground and saw a couple of Cnemidophorus sp. in the road out at the crest. Continued east to the Ocampo road (Mex Hwy) where it crosses the Rio Comandante. Worked along the north side of the river collecting and observing the following: Cnemidophorus Saw six, Jim got one and I got one. They were in the brush along the road above the river along the river. Very hot and very fast. Holbrookia I saw one along the river in fine gravel. Ctenosaura I saw two individuals - one large one in the wash at remains of a cement bridge and a smaller one in vegetation along the river. Both had well developed whorls of spines on the tail. Sceloporus variabilis In the brush and trees above the river on the crest of the bank.