Mch 5. arroyo at Harlingen, Cameron Co., Texas - area of mosquito brushland SE of city - such ebony trees as are present are dwarfed - Opuntia clumps common - no large trees. Foggy day, calm, humidity high. I was in area 9:00-10:00 am, 2:45-3:30 pm, 4:30- 5:20 pm. Birds noted along streamcourse & in uplands: Spotted Sandpiper Bewick Wren Belted Kingfisher Curve-billed Thrasher Accipiter sp. Mockingbird Lentius aurifrons Green Jay (4) Dendrocolos scalaris Myrtle Warbler Verdin 1 ♂ Longspurred House Wren (1) Great-tailed Grackle mixed flock at 5:15-(on way to roost?)-Redwings and Cowbirds I searched for reptiles in sandstone area around Opuntia patches 2:45-3:30 and noted no activity. After 4:30 I followed a tributary to the arroyo, a brook a foot or so wide with heavy covering of algae in places - banks soft making approach to stream difficult. Many small, fast-swimming fish but no amphibians seen. At this time I noted 2 Sceloprus active, one on log beside stream and other in Opuntia patch but the sting of which my noose was made was too heavy to catch these active lizards.