286 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



CHONDROTHYRETES TENEBRATA ALBOLABRIS, new subspecies 



rr^TE 20, FiGUHE 3 



This race comes from the Sierra Guacamayas. 



This subspecies has the shell orange or pale broAviiish orange; it 

 has the dark band behind the peristome, which is white or almost so. 

 The expanded outer peristome is obsoletely rayed on the front side 

 and a little more strongly on the back. 



The type, U.S.N.M, no. 468816, has 5.0 whorls remaining and 

 measures: Length, 24.0 mm; greater diameter, 15.8 mm; lesser diam- 

 eter, 10.8 mm. 



This race approximates C. tenehrata ayuensis but is a little darker 

 in coloration and lacks the conspicuous raying of the peristome and 

 is also smaller. 



CHONDROTHYRETES TENEBRATA MONTALVENSIS, new subspecies 



Plate 19, Figltre 3 



This race comes from the Coral de El Montalvo, on the road to 

 La Palma from the Sierra San Andres. 



Shell dark orange or blackish brown with the peristome orange^ 

 unicolor or banded, with or without a dark band at the sunamit. The 

 dark axial band is present behind the peristome, which is but slightly 

 rayed on the back. The front of the expanded peristome is obso- 

 letely rayed, or if rays are present they are inconspicuous. 



The type, U.S.N.M. no. 468856, has 6.0 whorls remaining and meas- 

 ures: Length, 26.0 mm; greater diameter, 16.3 mm; lesser diameter, 

 11.3 mm. 



This race in general appearance approximates most nearly typical 

 C. tenehrata tenehrata but can at once be distinguished from that by 

 having the expanded peristome orange instead of pale yellow. 



CHONDROTHYRETES RETICULATA, new species 



Shell conic, turreted, exceedingly variable in coloration, even with- 

 in the same subspecies. The shell may be pure alabaster white, pale 

 strawcolor, yellow, orange, red, buff, brown, or even sooty brown; 

 unicolor or banded with continuous spiral lines or zones of darker 

 color than the ground color, or the spiral bands may be interrupted 

 and the elements composing them may be arranged in axial series, 

 the shell thereby appearing varicially streaked. There is usually a 

 narrow white line at the sunnnit. In some of the subspecies there 

 is a dark axial zone immediately preceding the expanded peristome, 

 which is usually white or may be faintly yellow. The raying of 

 the outer peristome is not marked in this species, only some of the 



