H. uvasana is also compared with H. tejonis and H. carpenteri . Thin, delicate, depressed, with a narrow umbilicus, and moderately flattened outline. Pale pinkish-tan under a yellowish olive periostracum. Compared with both H. traskii and the newly described H. uvasana . Vasquez Rocks, Los Angles County, California.
Color is pale brown.
Apertural dentition includes two basal teeth, a single broad palatal tooth, and a prominent tooth on the parietal wall with a small callus within the aperture above the main tooth. The author relates the new species to the Chiricahuan Ashmunella species of Arizona based on some anatomical similarities. Named for Dr. Charles D. Miles, a prolific land snail researcher and field collector. Known only from type locality, but the author states that the Sierra Mariquita has not been thoroughly searched. The periphery is rounded, with a narrow umbilicus slightly covered by the reflected white peristome.