DRYM^EUS, MEXICO AND CENTRAL AMERICA. 37 



c. Unicolor : white, the columella only violaceous, peristome 

 yellow outside. 



Bulimulus (Drymaus) lilacinus var. /3, FISCH. & CROSSE, Miss. 

 Scient. Mex., Mollusca, i, p. 479. Bulimulus delattrei, schlanke 

 Lokalform, STOLL, Guatem. Reisen, p. 198 (1886). 



W. Guatemala: Cholhuitz (Stoll); Cerro Zunil 4000 feet; El 

 JReposo 1000 feet (Champion) ; Hacienda Buenavista and Hacienda 

 Helvetia, in virgin forest, at an elevation of from 3000 to 4000 feet, 

 descending in some localities to about 2000 feet (Stoll); Cuesta be- 

 tween Antigua and Escuintla (Stoll). 



d. Crossei (figs. 5, 6). White, with three narrow brown continu- 

 ous bands, the peristome whitish outside. 



Bulimulus (Drymaus) lilacinus var. y, FISCH. & CROSSE, loc. cit. 

 p. 479, pi. 24, fig. 5, 5a. 



N. Guatemala: Aha Vera Paz (Sarg). 



e. Jansoni (figs. 7, 8, 9). Fleshy, whitish, with 4 purple-brown 

 interrupted bands, and some narrow streaks ; peristome whitish out- 

 side, the throat roseate. Alt. 46, diam. 22, apert. 24 mill. 



Nicaragua (Janson). 



f. Ictericus (fig. 10). More slender, unicolored, yellow, the colu- 

 mella only violaceous. 



W. Guatemala, Cerro Zunil (Champion). 



D. SERPERASTRUM (Say). PI. 9, figs. 34-41. 



Shell umbilicate, oblong-ovate, thin but moderately strong ; white 

 or ochre tinted, with six blackish bands, the upper four or all of them 

 irregularly interrupted into oblong spots, bands iii and iv frequently 

 having the spots coalescent ; in some specimens all markings absent. 

 Surface shining, somewhat wrinkled and finely malleated, the degree 

 of rugosity very variable ; some fine interrupted spiral lines generally 

 visible under the lens. Spire long, conic, the apex rather obtuse, 

 with typical Drymaus sculpture. Whorls 6 to 6, moderately convex. 

 Aperture ovate, banded within ; peristome expanded, white, thin, 

 the columellar margin reflexed above. 



Alt. 38, diam. 18, length of aperture 18 mill. (Say's type.) 

 Alt. 35, diam. 16, length of aperture 16 mill. (Ticul.) 

 Alt. 33, diam. 16, length of aperture, 17 mill. (Ticul.) 

 Alt. 30, diam. 14, length of aperture, 15 mill. (Sitilpech.) 

 Alt. 33^, diam. 13, length of aperture, 15 mill. (Tekanto.) 



