Petelka 1946 Oct. 10 We left Mazatlán near noon time and proceeded northeastward to Pánuco, which was as far as the truck would take us. Pánuco is a small village nestled in a small bowl to one side of the Rio Pánuco at 2400 feet; it is the site of the gold mine run by the Patronos. Oct. 11 We were unable to leave Pánuco today because not enough pack animals were available. Observed Cathartes mexicanus, apparently resident, and Opornis tolmiei and Wiboria juquila, both migrants. Parrots, parakeets, and macaws flew overhead at various times during a stay in Pánuco; and Starker collected one magpie jay (Calocitta). Oct. 12 We left Pánuco at about 7 a.m. and followed the road to Santa Lucía and El Batel at approximately 1500 feet. On passing Santa Lucía, we approached El Batel, but turned up a draw through which the projected Durango-Mazatlán road has been laid out. We unpacked the mules at about 3 p.m., and spent the remain- der of the day establishing camp.