220 AMASTRA, OAHU. 



essentially with the color pattern of A. spirizona. It seems 

 to us to represent a pallid form or race of that species, or 

 perhaps of the similar narrow-banded form of nigrolabris. 

 It can hardly be "a variety of A. intermedia Newc.," as Dr. 

 Newcomb claimed (Ann. Lye., vi, 320). The var. b was sub- 

 sequently referred to A. albida by Pfeiffer. 



48c. A. s. chlorotica (Pfeiffer). PI. 35, figs. 19, 20. 



Shell subperf orate, ovate-conic, solid, rugulose-striate, whit- 

 ish, variegated in streaks with greenish epidermis ; spire conic, 

 rather acute. Whorls 6, the upper a little convex, the penul- 

 timate swollen, the last whorl about two- fifths the total length, 

 rotund. Aperture oblique, truncate-oval, white within. Colu- 

 mellar fold very slight, almost none. Peristome simple, un- 

 expanded, the columellar margin dilated, somewhat free. 

 Length 18, diam. 10.5, aperture 8x5 mm. Oahu, Frick in 

 Mus. Cuming (P/>.). 



Oahu, Main Range: Kalaikoa, Ahonui, Wahiawa (Gulick) ; 

 Kahana (C. M. Cooke). 



Achatinella rudis var. &,, PFR., P. Z. S., 1855, p. 5. Aclia- 

 tinella chlorotica PFR., P. Z. S., 1855, p. 203; Monogr., iv, p. 

 563, no. 4. A. albida PFR., t. c., p. 203, no. 6. THWING, 

 Orig. Descript, etc., pp. 154, 155 (Mt. Kaala). 



The shells from the localities mentioned above are referable 

 to A. albida, which seems to be not separable from clilorotica 

 Pfr. Typical clilorotica we have not seen. It appears to 

 differ from "rudis var. b" => albida by lacking the tawny 

 band or streak coloring; whether as a race or only as an in- 

 dividual mutation we have at present no means of knowing, 

 though material to decide the question is probably extant in 

 some of the great collections in the islands. 



These shells are merely A. s. nigrolabris in which the 

 purple-brown pigmentation is wanting, leaving the rusty-red 

 coloring and all other features unchanged. A. chlorotica is 

 the blond, A. nigrolabris the brunette. The series before us 

 shows no actual intergradation, yet the relationship is so inti- 

 mate that it seems proper to rank chlorotica as a variety of 

 the other. Such mutations are often observed where a single 



