Hoffmeister 1942 Itinerary May 17 Walker Cr., 4 mi. SW Olancho, Inyo Co., Calif. within 1/2' and 2' feet of my head, much like Brewer Blackbirds do when the nest is approached. May 18 Trap line of 50 mouse trap set among the grass and willows along Walker Creek and the adjacent rocky Artemisia grown sides yielded 24 mammals: 19 Peromyscus boylii (10 ♂, 9♀), 4 Peromyscus maniculatus (1♂, 3♀), and 1 yg ♂ Neotoma lepida; and 1 Bufo. One trap had the tail only of a Lerognathus (similar to the tail of P. penicillatus). This is the first evidence of any heteromyda. This morning I hunted in the next small canyon east of Walker Cr. Canyon (actually 1/2 mi. S junction of Falls and Walker creeks) for a Sciurus griseus that both W.C. Russell + F.A. Pitelka said they had heard in this canyon ([not seen]). I spent about an guy Pitelka hour in the canyon, going down the bottom of it. Oak grow rather densely in this small canyon and at its lower end there is a very small creek. There is also willow and a limited amount of underbrush. The only mammal I saw was a Lupus californicus. There was also abundant sign of Odocoileus hemiconus. Pitelka saw and heard the grey squirrel, he informs me, not in this canyon, but in the next canyon east. Saw 1 adult Citellus beechyi and several young. Saw numerous Cutanias and shot 1 out of an oak. Set 15 traps during the day in selected localities to catch chipmunks but got none. New birds seen today included Sage Sparrows and Green-tailed Towhee. Russell and I went owl hunting last night. Went into the canyon 2 mi. S junction Falls + Walker creeks. Russell called up and shot a brooding female Screech Owl. The wind was blowing quite hard and made hunting difficult. One the way up to the above locality is