PRONESOPUPA. 13 



Altogether four specimens of this species were taken on 

 two trips to Puukolekole, Molokai. They agree very closely 

 in form, color, structure and size of costa? with the Luakaha 

 form. The only material difference is the aperture is larger, 

 with the outer margin of the peristome having a darker 

 tinge. The largest specimen with 4 whorls measures : length 

 1.53, diam. 1.07, aperture (diag.) 0.8 mm. 



A single specimen in the Aucey collection from Hilo, 

 Hawaii, agrees almost perfectly with the Luakaha specimens, 

 the only difference being that the apex is slightly more acute. 



Up to the present time no specimens of this species have 

 been reported, as far as is known, from either Lauai or Maui. 

 This species, as determined by us, has not been collected in 

 large numbers in any locality except on Tantalus, Oahu. 



Undoubtedly it may sometime prove to be a fairly abun- 

 dant and widely distributed species on all of the islands, when 

 it is looked for under proper conditions. 



Section Sericipupa new section. 



Pronesopupffi of 5-5% whorls, closely and evenly costulate, 

 the costa? without membranous margins; embryonic whorls 

 convex, not flattened, very minutely granulose, the granules 

 much finer than in the preceding subgenera. Aperture usu- 

 ally edentulous, occasionally a minute swelling or fold ap- 

 pearing deeply seated on the columella. Type: P. frondicola. 



Distribution: on the highlands (above 3,000 feet elevation) 

 of Kauai, Molokai, East Maui and Hawaii. Specimens of this 

 section are extremely rare. As far as known all living ex- 

 amples were taken on the leaves of ferns and low-growing 

 shrubs and under the bark and moss of trees. 



The sculpture suggests possible descent from Nesopupilla. 



8. PRONESOPUPA FRONDICOLA n. sp. PI. 1, fig. 4. 



The shell is perforate (umbilicus minute, deep, circular), 

 conic, dresden brown, closely and evenly costulate, rather 

 glossy, thin, subtranslucent. Spire conic with obtuse, rounded 

 summit; whorls convex, separated by a rather deep suture, 

 apex less obtuse than in the preceding forms. Whorls nearly 



