K. Selander, 1954 Campylorhynchus brunneicapillus Jalquato to Mexico, P.F. March 14 Noted patches of habitat (tuna cactus formation) all along road from Jalquato % San Juan del Rio. Originally whole valley was covered with the tuna-cholla-mosquito formation but 95% of the lowland is now in agriculture. Made a stop around noon at a point 7 mi. E Queretaro, 5970 ft., Quer- etaro in a good hillside slope of tuna and cholla cactus. Cactus wrens were common - we heard them calling as we drove off the road. I found a nest with three fresh eggs placed in a cholla about 4 1/2 feet from the ground. Nest was in good condition and was lined with contour feathers of various birds + the saffron seeds [illegible] of some plant. The lining of the nest was less dense and thick than that of nests seen in Durango. Took photo of this nest and of the eggs. 2-6,17 I did not collect either bird of the pair I saw near this nest, but I took a bird about 30 yds away in a tuna cactus. This individual was carrying several pieces of dry grass - very fine. Only one nest was in the cholla bearing the eggs mentioned above but I found two other smaller nests in cholla about 25- 30 yds away. I examined 5 or 6 well-limult nests in the area without finding other eggs. All four specimens collected appear not to have reached breeding condition (see specimens examined). Bonine watched a bird sing several times from the top of a cholla and a tuna cactus near the car. The bird appeared