140 ACHATINELLA PULCHERRIMA. 



the main range, running from the summit down about three- 

 fourths of a mile along the ridge trail ; in axils of ieie (Spal- 

 ding, Merriam and Pilsbry). Types no. 108066 A. N. S. P. 

 Ootype in Bishop Museum. 



This charming shell has a great resemblance to A. abbreviata 

 of the eastern end of the range, from which it is separated by 

 about a fourth of the length of the island, wherein no re- 

 lated forms have been found. A. abbreviata is invariably 

 dextra'l, A. lila sinistral. There 'are also differences in the 

 patterns of the banded forms. It is likely that A. lila is more 

 closely related to A. nigricans, and therefore a derivative of 

 the byronii group of species, and not directly related to 

 A. abbreviata. The color-pattern 15c is -a "negative" of 15a, 

 the light and dark areas being reversed. In treating of the 

 genus Liguus I have noted similar instances. 



In the type 'lot the 'colors are in the following numbers: 

 Pattern of fig. 15, 1 specimen; figs. 15&, b, 8; fig. 15c, 5; 

 fig. 15d, 10. Four of the lot have the columellar fold white. 



A. lila is rather abundant on its misty peak, but soon be- 

 comes rarer and disappears as one descends the trail into less 

 cloud-hung levels. Near the summit only the black form is 

 found, the beautifully green-banded shells occurring lower on 

 the trail, where there 'are few of the black ones. The lateral 

 slopes of the ridge drop so precipitously that collecting is 

 almost restricted to what may be reached from the trail. On 

 the north side of the peak a poll of a couple of thousand feet 

 permits 'collecting only close to the summit. Named for L. L. C. 



6. A. PULCHERRIMA Swainson. PI. 27, figs. 2 (Ahonui), 5-5g, 

 6 (Wahiawa) ; pi. 31, figs. 13 (Kawaihalona), 14 (Hele- 

 mano) . 



"Shell ovate-oblong, subcylindacal ; white or yellow with 

 broad bands of chestnut; margin of the lip brown. Var. a, 

 golden yellow, suture chestnut. This very elegant species is 

 about 0.8 inch long, and is much more slender than any of the 

 preceding. It varies somewhat in form, some specimens being 

 more ventrdcose than others, and also in the number and color 

 of its bands. The ground color is a deep and rich chestnut, 



