Erichson, 1933 Catherpes mexicanus concolor (Canyon Wren) Palm Canyon, Riverside Co., California Dec. 27, 1933 9:00 Single individual heard rustling the dry leaves surrounding the base of one of the palm trees; came nearer to the surface of the dry leaf mass when I squashed; flew a few feet into a mesquite clump and went into another palm tree shelter. 11:25 Another individual located 1/8 of mile up canyon from where first was seen; first detected by rustling sounds as it moved about under the sheath of dry leaves enclosing the palm tree trunk; heard here for 5 mins. then came to surface about four feet above ground, within 4 feet of me; flew behind me toward ground and into another palm sheath through a small opening at ground level; was seen here momentarily then lost behind leaves; two palms were 11 yards apart. Uttered a clear call note as it left first palm and again briefly when it reached second tree. In both cases trees were in dense clumps in open part of canyon. No evidence of these Wrens were found in the narrower draw higher up the canyon.