Hanken, James 1975 Journal Mexico trip - Brownsville area 30 April 0800 hrs One other Natrix rhombifera and three more (cont'd) thamnophis. All snakes were found within 20' of the road (which crosses the canal); none were seen along the rest of the canal examined (several hundred yards) despite the apparent abundance of small (~1/2-1 1/2") fish in the water. I saw two Cnemidophorus gularis at the edge of the grass-scrub thicket, but was unable to capture any. Time of observation was ~1130-1230 hrs. In the afternoon we stopped at Villa Nueva, 1.5 mi. W Brownsville City limits, Cameron Co. This area was similar to the usual arrange- ment of agricultural fields and canals, but in addition there were several fence rows between cattle yards fringed with acacias and other thorned trees. There was also an extensive thorn forest with adjacent grassy clearings with scattered live oaks. Cnemidophorus gularis were extremely common along the fence rows and clearings with scattered oaks. Sam collected nine, Allen two, and myself three. Dan chased a Cnem into a wood rat nest and while picking it apart he found a large (~5') Philodryas melanoleucus. I saw a Sceloporus