166 PUPILLA, AMERICAN. 



Length 2.7, diam. 1.65 mm., 6% whorls. Rucker Co., Chiri- 

 cahuas. 



While P. hebes occurs near the eastern boundary of Ari- 

 zona in Apache and Graham counties, it has not been found 

 in New Mexico. The Utah localities are in the southeastern 

 angle of the state. It has been reported from Tecumseh and 

 Lawrence counties, Kansas, in river drift (Hanna, Nautilus, 

 vol. 23, p. 94), but I have not seen these specimens, and their 

 identity should be confirmed. 



An albino form, mut. albescens Ferriss, was taken among 

 aspens at the Betatakin ruins in northern Arizona, small 

 numbers being associated with many specimens of the usual 

 chestnut-brown color. Similar albinos were taken in one 

 place on Mt. Lemon, in the Santa Catalina range, also with 

 brown specimens, 6 albinos to 122 brown shells. 



Form kaibabensis P. & F., from the Kaibab Saddle, north 

 of the Grand Canyon, Arizona, was distinguished from hebes 

 by its shorter form, length 2.7 to 2.8 mm., diam. 1.5 mm., 5^ 

 whorls. While all of the specimens from the northern en- 

 virons of the Canyon were of this form, similar short ones 

 also occur in other lots from south of the canyon in northern 

 Arizona, sometimes associated with larger ones ; also in Eucker 

 Canyon, in the Chiricahua Mts., where all are small. I now 

 regard kaibabensis as a stunted or hunger form, the dimin- 

 ished stature being probably traceable to locally unfavorable 

 conditions which affect all individuals of a colony. It is 

 probably not of racial significance. 



Pupilla muscorum idahoensis H. & D. (pi. 19, figs. 18, 19) 

 resembles closely the hebes of Nevada, and does not seem to 

 be racially distinct. It is not, in my opinion, a form of mus- 

 corum. The crest is often strongly developed, as in muscorum, 

 but very weak in other specimens. The lip is thin, as usual. 

 It is from St. Charles, southern Idaho. Two measure : 



Length 3.3, diam. 1.47 mm. ; 6% whorls. 



Length 3.1, diam. 1.5 mm. ; 6 whorls. 



P. hebes nefas Pilsbry & Ferriss. PL 18, figs. 5 to 8. 



The shell is sinistral, usually with a small parietal lamella ; 



