Height 10.7 mm., diameter 19.3 nun.; 4-1/2 whorls. Type.
Height 10.3 mm., diameter 16.8 mm.; 4-1/3 whorls.
Genitalia (Fig. 151: 1, la). The penis is decidedly over one-third the diameter of shell and longer than the vagina (in hachitana between one- third and one-fourth the diameter of the shell, and shorter than vagina). It is very slender, with a short, stout basal sheath. Verge slender, tapering, over half the length of penis. Flagellum minute. Lower part of the vas deferens very little enlarged, narrower than the epiphallus. Length of penis 8 mm., verge 5 mm., epiphallus 5.5 to 6 mm., vagina 6 mm.; practically the same in three specimens.
Fig. 153. 1, Sonorella huachucana elizabethae. 2. S, huachucana mustang.
Arizona: Northwestern slope of Mt. Hughes, northern end of the Canelo Hills, Santa Cruz County, at about 5000 feet (J. H. Ferriss and Elizabeth Pilsbry), Type 120991 A.N.S.P.
The shells vary in diameter from 16.3 to 21. mm. It is smaller than S. hachitana with differently proportioned terminal male ducts and a very narrow brown band with broad white borders. The brown ground color is extremely pale. The photograph reproduced here is very much too dark. On account of the slender vas deferens I considered this a distinct species; unfortunately. I have now no material to confirm this point, and am ranking the form as a subspecies of S. huachucana.
Sonorella huachucana mustang Pilsbry & Ferriss Fig. 153:2.
Sonorella mustang Pilsbry & Ferriss. 1919. Nautilus, 33:20; 1923, Proc. Acad. Nat. Sci. Phila., 75: 65, pl. 1, fig. 2; pl. 4, fig. 5.
The shell resembles S. hachitana closely, differing by being slightly less depressed, the umbilicus somewhat smaller, contained nearly 7 times in the diameter; the last whorl descending less in front, and the aperture larger and less oblique. It is glossy, light pinkish cinnamon, fading to whitish around the umbilicus and on both sides of the chestnut-brown band above the periphery, which is visible above the suture on 1-1/2 to 2 whorls. The first
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