Marshall, 1939 4. Otus trichopsis Patagonia, Ariz. July 16 of oaks.) It was now about midnight & dark (no moon), a slight wind. Woody & I went down to the gate to work out our plan. He was under a sycamore near the gate & I stayed under some oaks near the side of the canyon. In both these trees, the cries had been heard. After a few minutes of utter silence (- to calm the owls down), Woody began to call; presently I began to answer him. After about 10 min, the cries were heard again, far away. Then in 5 more min, the hoots were heard from a solitary tree in the valley floor & about 25 yds. from Woody. He & I both continued to call. These notes were of same pitch & intensity & less-whistled quality as before but they were uttered in a rhythm: too-too toooo too too; too-too too', too too; etc. [music notation] rolled more like tootle middle C. given over & over again. The bird moved to the tree directly above Woody's head &