Quest 1948 Journal 60 May 11 Pozo Grande 25° ft 25°46'N 112°02'W Baja California what appeared to be a light radiation fog this morning. The pond is frequented by many Barn Swallows and Olive-green Swallows. About five Citellus atricapillus were seen along the road just as the arroyo started opening into the Magdalena Plain. May 12 24.3 mi by road SE of El Refugio 100° ft 24°33'N 111°35'W Baja Calif Minimum last night was 53° 47 live traps set on plain among Colli Pitiaya, and Cardones caught nothing. Dipodomys signs were apparent everywhere, however. Saw two bats flying at dusk last night Perognathus arenarius ab and Baileyi and Dipodomys merriami and agilis were caught by Dr. Benson. A very desolate landscape - a rolling plain with dirty plants growing in the dust and sand. Pitiaya "dulce" and "agua", Cardones, Opuntia cholla and Zumboi growing quite densely with intervening circular patches where ponds evidently stood during heavy rains. Most of the specimens were caught on the periphery of these circular mud flats devoid of vegetation - my traps were set in the denser growth and caught nothing. May 13 Santa Ana Arroyo de Los Viejos 25° ft 24°03'N 110°8'W Baja Calif Stopped here overnight for breakfast and dinner.