78 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV 
other stations the sizes are intermediate. Altogether, they re- 
semble closely the Coyote group specimens. 
In 1916, Rehn and Lutz took specimens in rocky foothills, 
3700-38725 ft. elevation, 2 miles north by east of Kitt’s Peak. 
A specimen from Station 120 has the penis of S. ambigua, but 
the papilla appears smooth (Plate V, figs. 8,9). Flagellum want- 
ing or very minute. 
Length of penis 11.5 mm. Length of epiphallus 9 mm. 
os ‘“ papilla Aiea ¥ ‘retractor 4.5 “ 
The shells are typical ambigua. Elevated and depressed ex- 
amples are figured, pl. II, figs. 3, 4. 
Comovo Roap to Aso.—The last Sonorella station westward, in 
the expedition of 1918, was at a small group of hills where the sign- 
board reads ‘‘Tueson 101 miles.”’ Beyond that the basaltic rocks 
were covered with white dust, perhaps alkali, or the granite faces 
were sharp and dry.® Station 127, small hills with Indian picto- 
graphs on the point nearest the road; 129 is back of the pictured 
rocks, west side, and south of 127. Station 130 was made between 
the preceding hills and the Quijotoa Range. 
Specimens from Stations 127 and 130 are typical S. ambigua in 
shell characters, but they average rather large, the range being 
from 21 to 26 mm. diameter. 
The penis-papilla is rounded at the end, not slightly enlarged 
distally as usual in ambigua. It is slightly wrinkled or smooth. 
The flagellum is short or rather long, 1.8 mm. in one example. 
Museum No. 118097 118089 118096 (cyclostoma) 
Length of penis 14.5 7.5 12.5 mm. 
i “* papilla ie 6 Sie ia: 
‘ ** epiphallus 13 8 1 a 
“* vagina 9 mete vias 
Station 130 127 126 
Plate. VI, fig. 5 2 6 
Nariz Mountains —At Monument 163 of the International 
Boundary, at the summit of the mountain, Dr. Mearns took two 
dead specimens agreeing perfectly with S. ambigua. They measure 
20.5 and 21.1 mm. diameter. No. 187479 U.S. N. M. 
Sonorella ambigua cyclostoma n. subsp. Plate 2, figs. 5-7. 
Station 126 (1918). Small hills south of Comovo road to Ajo 
about 3 miles west of Comovo Church. Type no. 118096a. 
5 Nautilus XXII, 3-9. 
