STBEPTOSTYLA. 151 



Mexico: San Cristobal, Chiapas, found inside of a large 

 Helix (E. W. Nelson, no. 107369 U. S. N. M.). 



Streptostyla nebulosa DALL, Proc. U. S. Nat. Museum, xix, 

 p. 364 (1896). 



"This species is nearest to S. bocourti Crosse and Fischer, 

 but has a more oval form, less pointed and less elevated spire" 

 (Dall). 



19. S. SUMICHRASTI Ancey. 



Shell cylindrie-oblong, thin, very glossy, obsoletely, flex- 

 uously substriatulate, bright fulvous-corneous, uniform or 

 with the obtuse apex paler. Spire gradate, conoidally taper- 

 ing. Whorls 6^/2, a little convex, separated by a channelled 

 suture, the last whorl elongate, slightly flattened on the right 

 side. Aperture subauriform, long and tapering above, some- 

 what dilated basally; columellar lamina thin, scarcely cal- 

 loused, long, spirally twisted, slightly truncate in front at the 

 base ; peristome slightly obtuse, flexuous, dilated forward in 

 the middle, receding at base. Length 29, diam. 13, alt. aper- 

 ture 19.5 mm. (Ancey). 



Isthmus of Tehauntepec (coll. Ancey, Dautzenberg, Jous- 

 seaume). 



8. sumichrasti ANC., Nautilus, xvii, p. 56 (Sept. 1903). 



"Related to the smaller S. lurida and S. bocourti, but much 

 more slender than the latter and of a more graceful oblong 

 shape than the former" (Anc.). 



20. S. CHIRIQUIANA v. Martens. PL 29, fig. 75. 



Shell ovate-conic, rather thin, yellowish. Whorls 7, sub- 

 plano-convex, at the suture margined, glabrous, glossy. Col- 

 umella short, arcuate and twisted. Aperture oblong, half the 

 total length. Length 22, diam. 11, aperture 11 x 4.5 mm. 

 (DaC.). 



Panama: Chiriqui. 



Streptostylus flavescens DA C., Proc. Malac. Soc. Lond., iv, 

 p. 66, pi. 7, f. 1 (August 1, 1900), not of Shuttl. 1852. 

 Streptostylus pallidus DA COSTA, t. c., p. 185 (March 19, 

 1901). Streptostyla chiriquiana MARTENS, Biologia Centrali 

 Amer., Moll., p. 615 (January, 1901). 



