282 PROCEEDINGS OF THE ACADEMY OF [Nov.—Dec., 
MOLLUSCA OF THE SOUTHWESTERN STATES—IX, THE SANTA CATALINA, RIN- 
CON, TORTILLITA AND GALIURO MOUNTAINS. X, THE MOUNTAINS OF 
THE GILA HEADWATERS. 
BY HENRY A. PILSBRY AND JAS. H. FERRISS.! 
The Santa Catalina, in Pima County, north of Tucson, is one of 
the large ranges of Southern Arizona, about forty-five miles in length, 
including its Tanque Verde and Rincon outliers, with an extreme 
width of twenty-five miles. Mount Lemon with an elevation of 
9,150 feet is heavily forested with yellow pine, quaking asp, cork 
bark fir (Abies arizonica), Douglas spruce (Pseudotsuga mucronata), 
cypress (Cupressus arizonica), other coniferous trees, large oaks 
and an alder as tall as a pine. The male fern and the brake stand 
here four feet in height. The Douglas spruce are eight feet in diam- 
eter. There is a forest gloom at mid-day, and a ground covering 
indicating a timber growth of many years without interruption by 
fires or lumbering. Winter often brings ten feet of snow. With 
numerous trout streams, it has the attractions, summer and winter, 
of the deep forests along the Canadian border without their annoying 
insects. 
In quantity and number of species of the smaller snails the north 
slope of Mount Lemon has the best record so far. The odor- 
shooting, rough-coated Sonorella also is here in large numbers under 
the fallen bark of the Douglas spruce and the dead poles of the quak- 
ing asp and cork bark fir. Unlike his brethren with a polished coat, 
this snail seeks food and cover similar to those used by the Polygyras 
of timbered areas in the Mississippi valley and eastward. 
The humid forest conditions of the region around Lemon Mountain 
prevail at Soldier Camp, Kellogg’s Peak, Alder Canyon, Alder 
Springs. The Spud Rock Ranger Station and other high peaks of the 
Rincon section, except in lacking cork bark fir, also follow Mount 
Lemon closely in forest conditions. They have the large oaks and 
conifers, the quaking asp, and the heavy floor of humus underfoot, 
but not quite as many snails. 
In the valleys of Bear Wallow and Sabino creeks, at the heart of 
the Santa Catalinas, the Arizonians of lower and hotter levels have 
a The field work covered by this report was by Ferriss, assisted in the Blue 
River region and the Mogollon Mountains by the late L. E. Daniels, 
