Marshall, 1939 Otus trichopsis Patagonia, Ariz. July 16 in Sycamore as we passed under it. We lay down under this tree in order to listen. I gave a few screech owl calls & presently Woody heard some answering notes. As I remember them they were They were in series, and ascending in pitch, as I remember. They were rather high, and who were of similar quality to the harsh early-morning notes of screech owls. "Quirt-quirt-quirt-quirt-quirt". I imitated these notes & proceeded down to the gate. The first individual was now silent, but beyond the gate, two more answered, with similar unmusical series of cries - also higher-pitched screeches & yaps. They retreated calling a while when I approached. Presently, I heard from low in the trees close at hand, a series of very low whistled notes - as low as I could whistle (middle C). They couldn't be told from my own whistle at middle C. "who-who- who - whoo - whoo - whoo - whoo." 7 syllables, all same pitch, all of