Koford, Rolf R. 1974 Journal 9 Dec. 5665 Hardy Ave, San Diego, San Diego Co., Calif. Dr. Lidicker, Larry Riggs, Pete Escherich, and I left U.C. Berkeley at 0930 in the MV2 pickup and camper. We got gas in Berkeley, went east via Hwy 580 to Tracy, where we got some cringed oats and chicken scratch to use as nice bait. From there we went south on Hwy 5, stopping for lunch for 1/2 hr., dinner for 1 hr., and arriving at San Diego (IBP Project House, 5665 Hardy Ave) at around 2120. We had arranged to stay at the house gratiz through Bill Glanz. The main purpose of the expedition is to gather blood and chromosome samples from the Microtus californicus subspecies in Baja. Also, though, we want to survey the Sierra de Juarez and Sierra San Pedro Mártir in general. I hope to find Tamiasciurus in the conifer zone. Apparently, too, Sciurus carolinensis were introduced in the San Pedro Mártir in the mid-40's, and Huey (1962) suggested that they may endanger the local chickaree. The main party (the other 3 plus Dave Krohne, who will come down later) will cross the border coming back on the 18th, planning to be back in Berkeley by the 19th of Dec. I may stay in Baja several more days with Bill Glanz. The valley was foggy most of the way down, with cool temperatures and light wind. We saw many American kestrels, rock doves, meadowlarks, coots, and Brewer's blackbirds. Also a mountain blackbird, turkey vulture, loggerhead shrike, redwinged blackbirds, ring-necked pheasant, and a marsh hawk. Also several Beechy ground squirrels.