JESimpson/1938 44. 50ft., Cerro La Cholla, 6m. www. Punta Penasca, Sonora. April 5, 1938, continued. from a trap-line at dusk; I grabbed the 22 cal. rifle and crawled to within 50 yards of the nearest birds and tried to pick off a drake but, shamefully, I missed. The resulting chaos was an inspiring sight: literally hundreds of birds in full retreat with gulls and turns screaming, plovers crying, ducks beating the water white and whirring into formation. Set out 60 mousetraps in the sand and sage just off the bay shore. April 6, 1938 Caught 7 Dipodomys merriami and 2 Perognathus longi- memb. (f 129; the other eaten to almost nothing, probably by an Onychomys torridus) The kangaroo-rats of the party lumped together equalled 19(120fs and 7 fs [noemb]); the cheek-pouch contents were saved. A large percentage of this material consisted of small, white, onion-like tubers found once or twice before. Where I got the rats many small pits were dug into the sand, parbys and rock. in digging out these tubers. Shot a lizard in the sand (130). Cerro La Cholla is a small sierra of granite blocks in a series of six or eight steep peaks rising from the level sand and cut by many washes. It is located on the Gulf of California between the nw shore of the bay of Punta Penasca and the se shore of the smaller bay between Cerro La Cholla and Cerro Prieto. On and near the granite ochotillo, cholla, and soft succulents dominate.