Newcomb’s tree snail (Newcombia cumingi), a member of the family Achatinellidae and the endemic Hawaiian subfamily Achatinellinae (Newcomb 1853, p. 25), is known only from the island of Maui (Cowie et al. 1995, p. 62). Newcomb’s tree snail has a sinistral (left-coiling) oblong, spindle-shaped shell of five to seven whorls that is coarsely sculptured (Cooke and Kondo 1960, p. 9, 278). Its shell is modeled with shades of brown that blend with the bark of its host plants. The adult reaches a length of approximately 0.8 inches (in) (21 millimeters [mm]; Pilsbry and Cooke 1912-1914, p 10 and plate 3). Baseline data on the life history of Newcomb’s tree snail in the wild is limited. The estimated age for maximum size is 4-5 years (Thacker and Hadfield 1998, p. 9). Adults and sub-adults appear to be outnumbered by juveniles in the wild (Thatcher and Hadfield 1998, p. 6). However, in the limited surveys conducted for Newcomb’s tree snail, largest snails were seen repeatedly, while smaller snails were often seen only once. While this certainly reflects the difficulty in finding the very cryptic small juveniles, it may also indicate high juvenile mortality or migration of juveniles from these populations (Thatcher and Hadfield 1998, p. 9). The absence of historical age-frequency distributions for most Hawaiian tree-snail populations provides little insight as to whether the observed situation is problematic or typical.