P.K. Selander, 1954 2 March 11 Chihuahua to 4 mi. WSW Jimenez, Chil., Mexico. Left the Santa Rita route at 8:00 and drone south- east to a point 16 mi. SE Chihuahua, 4800ft., where I collected two Amphisiza hiliinata from a small flock of 5 or 6. Wind was blowing rather hard so I decided against further collect- ing and we continued along the highway. At Delicias the bolt holding the fan to the motor block broke and we spent most of the afternoon at the Ford garage having this repaired. The charge was 54 pesos for labor and a new fan belt. At 4:00 P.M. we again started south and drone southeast thru Camargo. The area between Chihuahua and Camargo is probably unsuited for cactus wreene - just low scrubby bushes or farm land. About 5 mi. SSE Camargo a few fairly tall challas appear, along with some thorny brush-trees. This habitat improves as you go south -- we noted the first cactus wren nest about 10 mi. SSE of Camargo. Between 10 and 4 2 mi. SSE we counted about 15 nests placed either in challa or in thorny bushes. Most of the nests were about 5 feet above the ground. None of 6 examined appeared to be occupied at present and we saw no birds. I found two nests placed about 5 feet above ground in brush which grew was about 7 feet tall. There were no flowers or leaves on these brushes -- they are not mesquite but the branches are