AMASTRA. 51 



slender with smaller aperture. The whorls are rather flat- 

 tened, as in typical flavescens, with the suture less impressed 

 than in the following form. 



Eastern form (pi. 9, fig. 13). A large series from Olaa, 

 2550 ft. elevation, collected by Mr. H. W. Henshaw, and a 

 number from Glenwood, Olaa, taken by myself, show that the 

 eastern form has slight racial peculiarities. The shell is in 

 the average more slender than flavescens from Newcomb, with 

 more convex whorls and smaller aperture. The last whorl 

 is everywhere rounded. The thin cuticle on the last 2i/ 

 whorls is cream buff, streaked on the last whorl with chamois, 

 and towards the end of the whorl often with ochraceous buff. 

 The upper part of the spire is cinnamon or sometimes nearly 

 as light as the later whorls. Specimens measure : 



Length 15.4, diam. 7.8, aperture 6.4 mm. ; 6 whorls. 



Length 15.8, diam. 7.8, aperture 6.9 mm. 



Length 15, diam. 8, aperture 7 mm. 



Length 13.1, diam. 7.7, aperture 6.5 mm. 



The last measurement is of the broadest shell in my series, 

 the individual possibly not quite adult. Mr. Henshaw has 

 found a less slender form, with similar coloration, at Hono- 

 mou, 13 miles north of his Olaa colony. 



While this eastern race seems separable from the flavescens, 

 of Newcomb and Gulick, I refrain from naming it at this 

 time, as I have no Hamakua shells with exact locality. 

 Further comparison of good series is needed to demonstrate 

 the value of the Olaa and the South Kona races, and their 

 relation to Hamakua flavescens. 



A. HENSHAWI Baldwin. PI. 9, fig. 14. 



Mr. Baldwin's description was reprinted in Vol. XXI, p. 

 318, but the specimen figured was a very different form 

 which he subsequently sent out as A. henshawi, and not the 

 original species. Mr. Thaanum, who put us right in the mat- 

 ter, kindly gave one of the original lot of henshawi, collected 

 by Mr. Henshaw near the Buchholz place, Kona. It is drawn 

 in fig. 14. 



It is distinct from A. flavescens by its far broader contour. 



