R. K. Selander, 1954 March 11 4 mi. WSW Comargo to Jimenez, Chih., Mexico lined with short thorns. One nest was large and well-constructed, with the "tunnel" bending at an angle as it left the main portion of the nest. The opening faced south. The other nest was smaller and lacked a "tunnel" for the most part. Another nest [illegible] in the same general area but in another brush (about 30 yards from the first) had the opening cov- ered with twigs and apparently had not been occupied for some time. None of the nests showed later any evidence of having been repaired; all of the material was dry and old. From the number of nests seen from the road I would judge that there is a fair-sized population of wrens wrens nesting in the area - at least to a point about 10 mi. SSE Camargo. Cholla cactus is rather sparsely distributed but the thorny brush is fairly common and apparently serves well for nesting sites. The wind was blowing rather hard from the west - which may account for our not finding the birds - but I suspect that there are no wrens in the area at the present time. Near Jimenez we noted several nests in cholla. The habitat is similar to that 10-40 mi. SSE Camargo with perhaps more cholla. We pulled off the highway at a point 4 mi. WSW Jimenez, 4500 ft., and made camp. Wind blowing hard and dusty.