132 ACHATINELLA T^NIOLATA. 



collected by Gulick. A recently collected Waialae lot from. 

 Thaanum consists of (a) white shells with brown spire, (b) 

 white shells with numerous brown bands, as in Palolo tcenio- 

 lata, and (c) greenish-yellow shells with chestnut-olive streaks, 

 sometimes cut by white bands. There are various blends be- 

 tween a and c patterns. This colony is probably a siibvirens 

 X t&niolata hybrid. 



A small lot from Niu (Gulick) consists of well-colored 

 banded shellsi (t&niolata) , or streaked (rubiginosa), with 

 white ground: 



From Kuliouou (Thaanum) the specimens have the pattern 

 of Keawaawa form (&), see below. 



In a set of 9 from Keawaawa, 'coll. by Gulick, some have a 

 few faint bands, others being white, peristome and parietal 

 wall yellowish. The shape varies, as in Palolo shells : length 

 19, diam. 10 mm., to length 17, diam. lO^ mm. A lot from 

 the Thaanum collection, recently collected, there are (a) 

 shells variously banded with chestnut on a yellow ground ; ( & ) 

 the same with many oblique streaks or lines added, and (c) 

 others of rubiginosa pattern, the streaks blended. The yellow 

 ground shows probable hybridism with rutila or subvirens. 



On the northern side of the main range Gulick obtained a 

 few specimens in Kailua rather an indefinite locality. They 

 have streaked rubiginosa coloring, with paler spiral bands. 

 One has a greenish tone. They are transitional between rubi- 

 ginosa, tceniolata and subvirens. Size rather small, length 17 

 mm. It occurs also in Maunawili, on the northeastern slope 

 of Mt. Olympus, a place exploited by Messrs. Kuhns and 

 Wilder. Here the shells are white with dark or light-brown 

 upper whorls, paler (sometimes 1 white) embryonic whorls, the 

 last whorl either banded or with rubiginosa pattern cut by one 

 or more white bands. PI. 24, figs. 17, 18. 



(Species of the northwestern two-thirds of the Main Range.) 



SERIES OF A. BYRONII. 



What forms of the byronii group may occur upon the crest 

 of the main axis of the range between the known areas of 

 byronii and decipiens are not known to me. For this reason,, 



