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1915.] NATURAL SCIENCES OF PHILADELPHIA. 391 
colonies were found near by. Our second camp was at the cabin in 
the saddle at the head of Agua Caliente Canyon, somewhat above 
7,000 feet and close to collecting Station 6 of map. There is a good 
spring. The best collecting is in Walnut Canyon, Station 5, where 
three species of Sonorella live. From above this camp there is fine 
timber, but no land shells worth mentioning up to the summit of 
Mt. Hopkins. Good collecting stations were found in Madera 
Canyon which would be an excellent place to camp. “We also reached 
the head of Josephine Canyon from this camp. <A two-day excursion 
was made, via Brandt’s mining camp, over the 8,500-foot saddle 
north of Old Baldy, and down Camperel Canyon® to perhaps 7,000 
5 1-14 67 8 15 
eS 
Fig. 3—Collecting stations in the Santa Rita Mcuntains. Contour interval, 
1000 feet. 
feet. There is fine pine on the top and extending some distance 
down. Also some huge spruce and hemlock trees. We _ passed 
through aspens, then small-leaved maples, to walnuts, in the bed 
of the canyon. Sonorella clappi occurs here, and a few specimens of 
a Sonorella (occidentalis), which we provisionally rank as a subspecies 
of the Huachucan S. granulatissima. It will be seen that our work 
extended nearly across the middle of the highest part of the range 
in a rather narrow band, the collecting stations being marked on the 
accompanying tracing simplified from the U. 8. G. 8. topographic map. 
_> This canyon is not named on the topographic map. On it Stetson’s dam is 
situated, lower down. 
