NO. I ACHATINELLA APEXFULVA DIXON WELCH I99 



vertical variation between two areas is usually more marked than 

 the horizontal variation. In studying the patterns of any area or 

 locality in relation to other forms, not only must the shells in areas 

 on adjacent ridges on either side be considered, but also those above 

 and below the area on the same ridge. 



The color patterns of the Koolau Range can be divided into light 

 and dark. The light patterns are : i , white strongly banded with 

 reddish brown ; 2, white lightly banded or lined with reddish brown ; 

 3, white banded with yellow or tan ; 4, pink or flesh color, which may 

 be banded with white. The dark color patterns are : i , gray mixed 

 with pink ; 2, brown ; 3, grayish brown or gray ; 4, reddish brown ; 

 5, reddish brown banded with yellow ; 6, yellowish or tan ; 7, gray 

 mixed with yellow. 



The division of color patterns into light and dark forms in the 

 Koolau Range, while very close to the division of patterns between 

 zones II and III, is not the same. A dotted line has been drawn 

 (fig. 7, p. 194) showing the boundary between highland light color 

 patterns, usually present in zone III, and lowland darker patterns not 

 dominantly banded with white, which exist below the line in zone II 

 and lower zone III. With the exception of areas 30 and 33 

 (fig. 7, p. 194), which contain dominantly yellow patterns, all forms 

 above the dotted line are white forms banded with various colors, 

 usually reddish brown or yellow. In all areas below the dotted line, 

 with the exception of area 97A ? ?,^ not only are the shells darker in 

 color but also the patterns are axially streaked. Area 70, below the 

 dotted line, has white color patterns which are distinct from the 

 highland forms in being tinted with gray and in not having the white 

 ground color found on shells above the dotted line. Pink shells from 

 lowland areas {Z7^, 83b??) diflfer from pink shells found above the 

 dotted line in not being banded with white and in lacking white color 

 patterns. 



Therefore, the color pattern of shells coming from areas of high 

 humidity (most of zone III) tends to be dominantly white and 

 banded, while shells with darker patterns which are banded and 

 streaked occur in dryer situations (lower zone III, zone II, and zone 

 I). Although banded patterns are not characteristic of highland or 

 lowland forms, streaked patterns with the exception of area 97A??, 

 seem to be characteristic of shells inhabiting dry situations. This cor- 



^ Area 97A ? ? contains white color forms lightly lined and banded and not 

 markedly axially streaked. This locality is an exception to the general rule 

 concerning the color pattern of lowland color forms. 



