ACHATINELLA STEWABTII. 209 



cinnamon over an ochraceous buff or naples yellow 

 ground, sutural border paler, not streaked; often with 

 black band ii, or ii and iii ; columella white. 



3. Bilineata pattern, pi. 38, fig. 10. Having the upper dark 



band split, ground-color as in producta; or there may 

 be two dark bands on the producta ground (fig. 8). 



4. Melanistic forms, pi. 43, figs. 10, 10a, 10&, in which the 



dark bands occupy most of the surface. 



So far as I know, none of these patterns occur as pure 

 colonies. The common association is producta and dunkeri. 

 Figs. 7 to 7c were found by the writer on the base of a guava 

 bush, within a few inches of one another, together with several 

 young ones. Figs. 8, 8a were lodged side by side on an ad- 

 jacent bush, on the east rim of Tantalus bowl. As the guava 

 bushes here are isolated, singly or by small groups, in a knee- 

 high growth of Hilo grass, there can be no doubt that the 

 shells on each bush or group of bushes are an intergenerant 

 group. 



While most lots can be assorted by patterns, blends are 

 rather common. The dunkeri streaks may be excessively faint, 

 or they may be well developed in the early neanic stage, but 

 disappear in the later whorls, as in pi. 38, fig. 8a. 



The bilineata and melanistic patterns are not properly ele- 

 mentary patterns. Bilineata is of sporadic occurrence. The 

 split band is usually the upper, sometimes the lower. It oc- 

 curs also on shells with green ground (fig. 11) and on those 

 with dunkeri pattern, but is rather rare. 



The melanistic forms, such as pi. 38, fig. 13, Cooke coll., and 

 pi. 43, figs. 10, 10a, 10&, Thwing coll., Bishop Mus., are ex- 

 tremely rare, perhaps now extinct, and probably all from the 

 Pauoa side of Tantalus. 



PL 38, fig. 9 was found on the base of a kukui tree, con- 

 cealed by the high grass, in upper Makiki valley. Higher up 

 Tantalus they are found in similar situations on guava and 

 other shrubs and trees. They often rest in groups of three 

 or more on the lower side of the trunk or branches, concealed 

 by grass or other herbage. 



