162 STREPTOSTYLA. 



strong, obtuse plicse, somewhat glossy ; corneous- whitish irreg- 

 ularly painted with chestnut streaks, vanishing in the middle 

 of the last whorl, subvaricose. Spire long, the apex acute; 

 whorls 9, a little convex, the last less than one-third the total 

 length. Columellar lamina thin, twisted, subvertical at the 

 base of the aperture, forming a squarish channel. Peristome 

 simple, the margins joined by a thin callus, the right margin 

 arching forward slightly, basal margin receding. Length 9.5, 

 diam. nearly 5, 'aperture 3.5x1.5 mm. (P/V.). 



Chiapas ( Ghiesbreght, in Cuming coll. ) . 



Spiraxis dubia PFR., P. Z. S. 1856, p. 378 ; Malak. Bl. 1856, 

 p. 232 ; Monogr., iv, 580. Streptostyla dubia Pf r., MARTENS, 

 Biologia, p. 90, pi. 5, f. 10. 



Von Martens' figure, copied here, is from the type, the ex- 

 act measurements of which are, length 9.33, diam. 4 mm. 



Subgenus PITTIERIA v. Martens. 



Pittieria v. MARTENS, Biologia Centrali Americana, Moll., 

 p. 617 (January, 1901). 



"In the scheme of coloration and the smooth shining sur- 

 face it agrees with various species of Streptostyla, e. g. 8. 

 nigricans and S. mitr&formis; but the columella is scarcely 

 twisted and at the lower end distinctly truncate. From Glan- 

 dina it differs in the very smooth shell, without granulation, 

 and in the columella not being concavely bent" -(Martens). 



51. S. BICOLOR v. Martens. PL 29, fig. 86. 



Shell turrite, rather solid, very lightly striatulate, glossy; 

 rufous-brown with -a wide sulphur-colored subsutural zone. 

 Spire long-conic, the apex rather obtuse. Whorls 7%, the 

 first minute, papilliform, the second globose, both uniform 

 brown, the following whorls regularly increasing, slightly 

 convex, with the suture appressed, margins with a groove; 

 the last whorl slowly tapering at the base, slightly convex, 

 not deflexed in front. Aperture subvertical, elliptical, but 

 angular above and below; peristome simple, obtuse, brown- 

 margined within, the throat gray-bluish; outer margin slightly 

 arcuate above, more so below; basal margin produced in a 



