136 ACHATINELLA BYRONII. 



verse lines. Length fourteen-twentieths, diam. eight-twen- 

 tieths inch " (Newc.). 



Oahu: Ewa (Newcomb) ; Waimalu, Waiawa, Waipio (Gu- 

 lick). 



Achatinella rugosa NEWC., P. Z. S., 1853, p. 138, pi. 22, f. 

 22, 22a, 1854. PFB., Monogr., iv, 521. SYKES, Fauna Ha- 

 waiiensis, p. 309. THWING, Orig. Descript, pi. 1, f. 24. 

 Bulimella rugosa LYONS, Hawaiian Almanac and Annual for 

 1892, p. 104, pi. 1, f. 2. 



Newcomb 's original figures are reproduced, pi. 29, figs. 22, 

 22a. They are like the shells collected by G-ulick in Waiawa 

 valley (pi. 27, fig. 8), which is probably what Newcomb meant 

 by" Ewa." 



This race inhabits valleys and ridges mainly southeast of 

 those occupied by ~byronii. It differs from that by having the 

 last whorl usually more strongly corrugated, the lip-callus 

 thinner, the whole lip of a brownish flesh-tint, at least typi- 

 cally, and the shell has the gloss of fresh varnish. 



There are, of course, specimens which taken by themselves 

 could hardly be classified correctly; occasional individuals 

 may be smooth or nearly so. The occurrence >of almost black 

 (brown-black or green-black) shells in most colonies of rugosa 

 is 'characteristic, since byronii is rarely if ever so dark. The 

 embryonic whorls are grayish-buff, flesh-colored or white. 



The color-patterns are: (1) greenish-yellow, profusely 

 streaked with green, or yellow streaked with brownish-olive, 

 either plain or with two spiral brown bands and a subsutural 

 band, (2) last whorl black or nearly so. There are also inter- 

 mediate specimens connecting the darkest and lightest. 



In a lot from Waimalu there are no banded shells (pi. 27, 

 figs. 9, 9a) . This place must be at or near the extreme south- 

 eastern limit of the species. Waiawa shells are very often 

 banded, and with a small proportion of the blackish form ( pi. 

 27, fig. 8). In a lot from Waipio the blackish-chestnut form 

 predominates (pi. 27, figs. 10, 10&). All the preceding are 

 from the Gulick collection, and probably all of them were 

 taken at rather low elevations. 



Length 19.3, <Mam. 10,2, aperture 9 mm. ; G 1 ^ whorls. Wai- 

 pio. 



