48 5 mi. N Tehuacán, 1676 m. May 26 days and study jocoros rather than go up for a days' hunt at "La Puerta". (I learned yesterday that the local name for the top of the grade is El Puerto not La Puerta. Lomb is mistaken in calling the locality "La Puerta") Surrounding the valley of Tehuacán there is a ring of sloping hillsides covered with a uniform stand of desert vegetation including a yucca, a good sized tuna cactus and magueite + a few other small trees. The valley floor is farmed but patches of this desert vegetation are found between the farmed fields, such as at the place where we are camped. Around camp there are re- mains of several dirt huts in the center of dense stands of magueite and tuna and at the edges of several of the fields there are rows of tall yucca trees. At short distance from our camp there is a marshy hole formed by wells I imagine and also several irri- gation ditches, along which grow some tall trees of several types - one evergreen somewhat like the orange tree in leaf shape, another looks like an olive. These trees doubtless are dependent on the special cond- itions of good water supply found near the ditches and the marshy area. The region is definitely lower Sonoran and does not differ in any respect with possible exception of yuccas - from many desert areas in northern Mexico where bermsuicapillus occurs. C. jocoros is abundant here both on the desert slopes, in tuna, magueite, other trees, and