PRONESOPUPA. 15 



more near the peristome than in the typical form. Length 

 2.32, diam. 1.35, aperture (diag.) 0.92 mm. Holotype 11034 

 Bishop Museum; paratypes 38785 Bishop Museum and A. N. 

 S.P. 



E. Maui: Puunianiau at 7,000 ft. (type loc.), Ainahou and 

 Halemau (Cooke). 



All the specimens of this subspecies were taken living in 

 moss on the bark of trees. It appears to be an extremely rare 

 form, but will probably prove to be widely distributed over 

 the mountain of Haleakala. 



In an immature specimen with 3% whorls, the surface 

 structure of the embryonic whorls is fairly well preserved. 

 The surface is minutely granulose, the granules being indis- 

 tinctly arranged in transverse rows; near the beginning of 

 the second whorl there are faint indications of the rib-striae 

 as low blunt ridges. The initial portion of the first whorl is 

 immersed with the upper portion of the second whorl form- 

 ing a distinct blunt ridge bordering the suture. 



9. PRONESOPUPA MOLOKAIENSIS n. sp. PL 1, fig. 5. 



The shell is very like that of P. frondicola but slightly 

 smaller, darker colored and narrower in proportion to its 

 length. The aperture is vertical, not slightly diagonal. The 

 surface of the two lower whorls is covered by somewhat 

 coarser costulation, the riblets about 0.07 mm. apart. There 

 is a minute, deeply situated swelling near the middle of the 

 inner face of the columella, as in a few of the specimens of 

 P. frondicola. Length 1.96, diam. 1.04, aperture (diag.) 

 0.73 mm. 



Molokai: Kawela, at about 3,500 ft. (type loc.), and Wai- 

 kolu, about the same elevation; on the leaves of low plants 

 (Cooke). Holotype 41806 Bishop Museum. 



Only two examples of this species are known at present, 

 one from each of the localities mentioned above. It is with 

 some hesitancy that we separate the above species from P. 

 frondicola of East Maui, under which it might not improperly 

 be placed as a variety. The coarser and more distant costae, 

 as well as its geographical distribution, are the most impor- 

 tant reasons for considering them specifically distinct. 



