314 PROCEEDINGS OF THE ACADEMY OF [NoV.-DeC, 



men of Pupa hordacea seems to have been given to Mr. Binney; the 

 other species taken by Dr. Horn are in the collection of the Academy. 

 As Dr. Horn was also at Gila Bend, Yuma and other places in 

 western Arizona, the possibility of an erroneous locality label for 

 the specimen of M. praesidii is to be considered. That specimen was 

 not mentioned in Gabb's paper, but he would doubtless have con- 

 sidered it a small "H. strigosd". 



Sonorella rooseveltiana (Berry). PI. VI, figs. 9, Oa, 9&. 

 Nautilus XXXI, July, 1917, p. 14. 



Roosevelt, Gila Co., Arizona, 2200 ft. elevation. Figures of the 

 type, supplied by Dr. Berry, are here given for comparison with the 

 forms of adjacent counties. They are 1.6 natural size, the diameter 

 being 16.5 mm. 



S. rooseveltiana appears to belong to the hachitana group, but the 

 single specimen dissected was quite immature. It is, we believe, 

 the only mollusk reported from Gila County. 



Sonorella dslicata n. .sp. PL VI, figs. 6, 61, Qb. 



The shell is umbilicate (umbilicus contained slightly over 6 times 

 in diameter of shell), thin, somewhat translucent, light ochraceous- 

 buff with several pale or whitish oblique streaks on the last whorl, 

 and a cinnamon-brown band above the periphery. Glossy, having 

 the usual weak irregular growth-lines. The embryonic whorls are 

 nearly smooth, but short, protractive threads may be seen near the 

 suture. 



The last whorl is wide and descends rather slowly in front. The 

 aperture is strongly oblique, rounded-oval. Peristome thin, ex- 

 panded, with a dull brown edge. 



Alt. 10.5, diam. 18.3 mm.; 4^ whorls. 



Genitalia (fig. 10) remarkable for the small size of the male organs. 

 The length of penis is about one-fifth the diameter of the shell, very 

 slender, having a stout basal sheath, and containing a short, cylindric 

 papilla. The epiphallus is longer than the penis, terminating in 

 a short flagellum. 



Length of penis 3.5 mm. 



papilla 1.2 " 

 epiphallus 4.5 " 

 flagellum 0.4 " 

 vagina 5.5 '' 



Northern end of the Peloncillo Range, about 6 miles south of the 

 Gila River, on the toll road between Solomonsville and Chfton, 



