R.K.Selander, 1953 2 C. brunneicapillus San Telmo, 6 o'pt., Baja California 7eb.3 cactus about 10 feet from the first nest. Both were empty. The pairs activities seemed to center more or less around this "nest tree"; although they ranged 50-75 yds in all directions from it. I did not hear the staccato "cha" note that I heard guttatus give in northern Mexico. Cactus wrens are probably widely scattered in the San Telmo region -- i.e. sparsely distributed in local cactus associations. These birds appear to be feeding on or near the ground. Flight is direct and near the ground. 7eb.4 12-20 miles E El Rosario, 1000-1500 feet, Baja California. - Cactus wrens are present in this rather rich desert vegetation but are so wary that I cannot approach within gun range. Heard the "cha-we-cha-we-cha-we" call. Given very rapidly and rhythmic fashion. Carries a good distance. When approached the birds become silent and fly off 30-50 yds. Several nests seen in opuntia cactus. All empty. No attempt on part of birds to defend nest area. In fact I got the impression that the cactus wrens have no fixed "home" areas.