R.K.Selander 1952 Sitta pygmaea Aug. 31 Cuernavaca highway, 8700 ft., near la Cima, Distrito Federal, Mexico. -- Encountered a flock of 5 or 6 individuals in company with several Parus sclateri and Periclimenes olivaceus in a pine tree. The particular pine in which the linds occurred was located at the lower edge of a rather extensive pure pine forest covering several rolling hills which surround a depression. The depression is heavily vegetated with "lumbel-grass". The nut-hatches were foraging on the smaller branches and twigs near the top of the tree (=about 30 feet above the ground). Their mode of foraging was similar to that of the Chickadees. On several occasions, I noted a nut-hatch hang momentarily beneath a small twig. One bird flew down to the trunk of the tree and perched head-down. I shot this individual, but could not recover it as it fell into a space between two large boulders. The other nut-hatches were not disturbed by the shot, but continued feeding actively. Seemed intent on working over the needle sheaths. Collected two (an adult ♀ and an ♂? adult). Both in fresh plumage -- some tail feather overheathed. -- As to vocal sounds, none were given which I could transcribe -- but a constant soft chatter was heard frequently. This species is seemingly is rather rare in this area, as I failed to locate it during my stay at 15 mi. N Cuernavaca, 8900 ft., Morelos.