48 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV 
sweet potatoes, and there were hot biscuits, jam and peaches on 
Christmas day. 
The next day living Sonorellas were found at four stations. A 
diamond rattler, mountain sheep, black-tailed deer and small game 
were in evidence, here under the shadow of the chief city of the 
state, more than in any range visited in 1917-18. 
The Christmas reconnoiter was satisfactory. A few days were 
needed to finish up the Tucson hills and again we camped there. 
This programme was repeated a number of times, and the west 
side of the range during the months of January and February was 
well explored from Catt mountain on the south end to Relitto 
village on the north, about 35 miles. 
During the last week of February the newly paved county road 
was taken to Ajo. The machine ran as though on air. Some 
twenty-two miles west of the city, on the Robles ranch, small 
buttes of limestone capped by lava appear, not over 100 or 150 
feet above the desert floor; but we turned aside for a couple of 
miles and investigated. Sonorellas were very plentiful and alive. 
Heretofore the highest peaks of Arizona, at least from 8,000 to 
10,000 feet, have been our idea of snail prosperity. The species is 
a small form of S. ambigua, here at the eastern limit of its range. 
This discovery caused a deflection to the nearby Roskruge range 
where further good fortune awaited us, Sonorella berry, and others; 
and it was the 7th of March before we were again on the road to 
Ajo. These mountains are on the right of the county road, but the 
Coyote range on the left seemed much higher than when viewed 
from the Baboquivari peaks. Thus another deflection, and our 
tents were pitched in the main canyon, or cove of the Coyotes 
facing eastward. Here was a half section or more of level land, 
well-forested with mesquite and paloverde, long known for its 
ranch houses, mines, and good water. Four domes of granite 
tower on the southwest. There are thick groves of oak, and a 
wealth of snails and ferns, one of the most pleasing places in this 
region (see maps, Text-figs. 5 and 6). 
Sonorella ambigua grows larger in the Coyotes than elsewhere. 
It is also the prevalent Sonorella in Bobb’s Butte and the southern 
Roskruges, where S. berryi and an interesting small race of S. tu- 
mamocensis were taken in single colonies. 
On the 22nd of March the Coyotes, Kitt’s Peak and a spur of 
the Baboquivaris were left behind. Water was taken on at Indian 
