LW014 1964 Journal August 31 Km 1812 16 mi N Navjoa, to 30 mi E Hermosillo, Sonora, Mexico Up at 0515. After breakfast Dub went out to collect Rufous- winged Sparrows while I tried some play-back experiments using a [illegible] song + a model of Aimophile semicincti. Although I tried the play-back three (for 10+ minutes each time) in territories of 2 singing & 2 I obtained no obviously positive responses. Both of 2 went to tops of trees + sang soon after I retreated from the area, but did not approach the recorder (or model). As other birds were singing actively in adjacent territories I consider the reaction of 2 tested birds to be routine + not prompted by the experiment. Then collected carpalis for <1 hour + obtained 12 birds- collecting 200+ yards of camp in semicircle. Others still left in same area when I stopped collecting - this gives some idea of the remarkable abundance of these birds in this mesquite woodland-shoals habitat. Together we collected 24 carpalis plumbea + [illegible] [illegible]. Then up 0830. Skinned until 1200 when packed car + headed north. Seen extremely hot, but carpalis sitting in exposed positions at tops of mesquite singing. North of Guaymas had tin trouble so drove slowly on foot fire back into Guaymas when bought a new fire for $37. Ate supper in Guaymas before driving on to Hermosillo when arrived about 0745. Bought gas then took gravel road - some 50 ft turn to E (toward La Colorado). Drove to near km 51 where camped for night.