R.K. Selander, 1952 Troglodytes brunneicollis August 1 La Puerta, 7000 ft., 31 mi. SW Orizaba, Veracruz, Mexico. Obtained a specimen in - fairly open brush beneath oak tree near a dirt road. Two birds were seen together, one of which was collected. I am not certain of the niche preference of this wren but it is apparently similar to that of T. adelon of the western U.S. (Utah). August 13 15 mi. N Cuernavaca, 8900 feet, Morelos, Mexico.- One individual came to a squeak in low brush beneath fine-oak tree and was obtained. Saw another in similar situation. Both birds frequenting semi- open places - edge of thicket. August 14 Pair squeaked up in thicket beneath a very large pine tree. Very active and excited. Notes a soft "cha-cha-cha" not unlike that of C. megalopterus but much softer, less harsh; more "house-wren-like". August 15 Four different pairs observed - all in dense thickets. "Cha-cha-cha ...." notes given frequently, ofter quite loudly. Very inquisitive.