K.Selander, 1952 Compylorhynchus megalopterus nelsoni La Puerta, 7000 ft., 31 mi. SW Orizaba, Veracruz, Mexico. August 2 Four near comp at 9:15, calling loudly. While undoubtedly giving the "angh" call, I note that, from a distance, the sound is "cha". "Cha-cha-cha-cha" very common. "Cha-cha-cha" most frequent. Once a bird gave "che-de-dit, chi-de-dit, chi-de-dit" very rapidly. Also a nasal, low "luudtt - luudtt - uuuddtt" given. Heard the "shree" call again, but a Steller Jay was in the area. Still, I believe this is a call given by the wren. The notes of this species are not at all distinct. Sound a little like the note of the White-breasted nuthatch, i.e. has the same tonal quality. Birds very wary this time. Hard to find since there is a dense fog around comp. Birds frequenting the higher portions of the oaks. August 13 15 mi. N Cuernavaca, 8900 ft., Morelos, Mexico. Found several bands of wrens in oak-pine forest today. Discovered first group by hearing their loud chatter. Located a flock of about 8 birds feeding in an oak tree and a large pine tree. Saw one bird running along the limb of the pine tree about 20 feet above the ground. Bird moved fairly rapidly, sometimes turning sharply and flitting from branch to branch. Seemed to be searching along the smaller branches and at the bases of the needle sheaths. Noted other birds searching over epiphytic moss & small ferns on an oak tree. They are very agile and sometimes O. m. megalopterus