-14 July and then went to a small oxbow pool beside the river to collect the frogs that were calling. Got the following: Hyla arenicolor; one from the mud bank. Only one heard or seen. No, John got a second. Both prepared in frozen tissue 09-235 Castorophryne: gets from in the water. The call is an introductory "wheep" followed by a longer high-pitched "braa" or trill. Compare with the microhylids heard calling on 9 July 14. 6 miles E. Mazocatrii. Many more were not collected. This includes the animals collected by Carl, Phylp [illegible] on the 9th and the 14th. The locality will be described more fully tomorrow after it is seen in daylight. 4 July Awoke about 8:20am - the latest of the trip so far. Sky clear. Coffee & peanut butter & jelly sandwich for breakfast; then off to collect liquid. Description of the locality: The area is basically two subareas. The road from Naco de Chico goes east up and over a steep oak-cored ridge and then down into a wide amphitheater-like canyon which faces east. At the bottom of this can [illegible] Bonita canyon is the Rio Bonita which drains into the Rio Naco which in turn drains into the Rio Yaqui. The Rio Bonita comes up in an amphitheater-like canyon from the north through a rather steep