OXYSTYLA, MEXICO, ETC. 127 



Ario (Uhde); Cuernavaca in the State of Morelos (Boucard). S. 

 Mexico: State of Oaxaca (Boucard). 



Localities for forms referred to 0. boucardi: S. W. Mexico: Villa 

 Aha in Oaxaca, on the slope of the central elevated plateau towards 

 the Rio San Juan, copiously (Hoge); Oaxaca (Hb'ge); Mountains 

 of Betaza, 20 leagues from Oaxaca (Boucard); Cerro Negro, Tehuan- 

 tepec (Suinichrast); Tehuantepec (Strebel, Richardson, Dr. J. H. 

 Streets). 



Bulimus zebra var. p PFR., Monogr. Helic. Vivent. ii, p. 144 

 Orthalicus longus PFR. Malak. Blatt. xii, p. 39 (1865). FISCH. & 

 CROSSE, Miss. Scient. Mex., Mollusca i, p. 450, pi. 18, f. 4. STRE- 

 BEL, Beitr. Mex. Land- und Siissw. -Conch, v, p. 43, pi. 6, f. 1 a, b, 

 c, d. Ortalichus longus v. MARTENS, Biol. Centr. Amer., Moll., pp. 

 181, 189. 



Orthalicus boucardi PFR., P. Z. S., 1860, p. 138, pi. 51, fig. 7; 

 Malak. Blatt. viii, p. 16 (1861). v. MART. Malak. Blatt. xii, p. 37 



(1865). PFR. Monogr. Helic. Vivent. vi, p. 200 FISCH. & CROSSE, 



Miss. Scient. Mex., Mollusca i, p. 451, pi. 18, f. 3, 3 a, b. STREBEL, 

 Beitr. Mex. Land- und Siissw.-Conch. v, pp. 40, 41 (forms A B), pi. 

 1, f. 1 a, 2 a-g (form C) pi. 1, f. 1 b, c. Ortalichus boucardi v. MAR- 

 TENS, Biol. Centr. Amer., Moll., pp. 181, 187, pi. 11, f. 4, 5, 11. 



The solidity of the shell, boldness of the dark and rather straight 

 streaks on a white or in part rusty ground, and numerous broad vari- 

 ces, as well as the rather short aperture with broadly black-edged lip, 

 distinguish this species when typically developed. It is, however, 

 extraordinarily variable, and I am compelled to unite 0. boucardi as 

 one of its satellite forms. 



In Pfeiffer's type of longa (pi. 21, fig. 34), which has been photo- 

 graphed and described by Strebel, the stripes are but little angulated 

 but are mostly forked on the upper fourth of the last whorl, and are 

 grayer there, giving the zone below the suture a paler tone, the 

 suture being also bordered below with white. The color of the stripes 

 is not so vivid as in 0. boucardi, and especially on the last whorl 

 becomes grayish ; they are mostly chestnut-edged, or there are also 

 handsome chestnut-brown growth-streaks besides the black variceal 

 streaks. The nuclear point of the apex is brown, and on the third 

 or third and fourth whorls a submedian band, though sometimes in- 

 terrupted, is distinctly developed. There are no bands on the last 

 whorl, and the longitudinal streaks continue to the base. 



