1915.| NATURAL SCIENCES OF PHILADELPHIA. 411 
oblong, contained between seven and eight times in the diameter 
of the shell. Avellaneous in color, paler around the umbilicus and 
slightly so on both sides of the chestnut-brown shoulder band. Sur- 
face glossy, lightly striate, the embryonic shell of 13 whorls with 
S. hachitana sculpture. 
Whorls 5, slowly widening, the last whorl very broad and capacious, 
rather strongly descending to the aperture. The aperture is very 
large, oblique, the peristome well expanded except near the upper 
termination; margins converging, joined by a thin callus. 
Alt. 15.7, diam. 28.4 mm.; umbilicus 3.7 mm.; aperture 16.4 mm. 
wide, 13.7 high. ; 
Cababi Mountains (about 75 miles west of Tucson), collected by 
Frank Cole, March, 1915. Type No. 112,253, A. N.S. P., cotypes 
in Ferriss collection. 
This is one of the largest species, very much resembling S. ashmuni 
Bartsch, from Richinbar, Yavapai Co., which has a slightly smaller 
aperture. As the localities are several hundred miles apart and 
separated by the depression of the Gila.River, they will probably 
turn out to be distinct when the genitalia of both are examined; 
but as no differences which could reasonably be called specific appear 
in a close comparison of the types, we rank the southern form as a 
eubspecies. 
The nine specimens collected measure 28.4, 27.9, 27.8, 25.5, 24.8, 
24.6, 24.5, 24, 23.9 mm. diameter, being therefore variable in size. 
Sonorella ashmuni ambigua n. subsp. Pl. X, figs. 6, 6a, 6b. 
The shell is smaller than S. a. capax (diameter 20.9 to 23.4 mm.) 
with the last whorl widening somewhat less, the aperture more 
rounded. 
Alt. 13.5, diam. 22.5 mm.; umbilicus 3 mm.; aperture 12.2 mm. 
wide, 11 high. Whorls 43. 
Cababi Mountains; No. 112,254 sent with the preceding, but 
whether collected in the same place is not known. They were 
taken in March, 1914, by Mr. Frank Cole, Mr. Ferriss’ guide in 1913. 
Thirty-two specimens measure as follows in diameter: 20.9, 
ar (2) sertet 21.3" (2), 21:4 (2); 21.5,'21.65(@2); 21.7 (2), 21.8, 22° (5), 
Beat Ame, 22.4, 22:5 (3) ,22.6, 22.7, 23, 20.2, 23.3, 23.4. 
We are in some doubt about the status of this form, but it is 
readily separable from S. a. capax in the series seen. The genitalia 
when examined will no doubt clear up the uncertainty. 
