OXYSTYLA, MEXICO, ETC. 181 



ker); Tepic (Richardson); Culata, near Manzanillo, State of Colima 

 (Lloyd, June, 1889); Colima (Rolle); Dos Arroyos, 25 miles N. E. 

 of Acapulco, State of Guerrero, at an elevation of 1000 feet above the 

 sea (H. H. Smith). S. W. Mexico: Tehuantepec (Strebel). 



Orthalicus ponderosus STREBEL, Beitr. Mex. Land- und Siissw.- 

 Conch. v, pp. 35, 36, pi. 7, f. 1, 5, 8. ROLLE, Nachrbl. D. M. Ges., 

 1895, p. 130. Orthalicus boucardi-ponderosus STREBEL, ibid., p. 39, 

 pi. 1, f. 4 a, b (corrected on p. 132 to ponderosus-boucardi). Orthal- 

 icus lividus-princeps STREBEL, ibid., p. 31, pi. 1, f. 6 Ortatichus 

 ponderosus v. MARTENS, Biol. Centr. Amer., Moll., pp. 181, 190, 

 pi. 11, f. 9, 10, 10a. 



" Strebel did not know the exact locality of the specimens which 

 he described ; but the collection of Dunker and the materials placed 

 in my hands by Messrs. Godman and Salvin show that this remark- 

 able species belongs to the western coast of Mexico, where it is some- 

 what widely distributed. In the Berlin Museum there is a shell 

 much resembling this species, received from Dr. H. Dohrn, and said 

 to have been found at Juraty, on the Amazon river. A similar shell 

 is also stated to have been found in Colombia, in the holes of trees, 

 by Wallis (see Mousson, Malak. Blatt. 1869, p. 179). 



The apex is generally dark chestnut-brown, but in some appar- 

 ently fresh specimens it is pale. The broad black lip inside the 

 aperture is to be seen in young specimens measuring 43 mill, in 

 length. The aperture is all around of a shining black, only the colu- 

 mellar edge itself is pinkish-white, with the base of the aperture black, 

 the white forming a more or less narrow streak on the columella. 

 The general color of the shell is yellowish-brown ; the dark streaks 

 are more distinct on the upper whorls, confluent and often very in- 

 distinct on the last." (Martens.) 



O. DECOLOR (Strebel). PI. 54, figs. 43-47. 



Shell ovate-conic, thick and ponderous. First whorl black, second 

 and third yellowish or pink, small brown streaks appearing on the 

 third whorl ; on subsequent whorls of the spire the ground is whitish, 

 with broad dark-brown angular stripes, usually forked above, and a 

 super-median interrupted dark band. Stripes sometimes continue 

 upon the first half of the last whorl, angulated at positions of the upper 

 and peripheral bands, and terminating at an interrupted basal band; 

 the latter half of the whorl reddish- or orange-brown, longitudinally 



