260 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



CHONDROTHYRA (CHONDROTHYRA) TOSTA AURANTIA, new subspecies 



Plate 15, Figuije 1 



Ground color yellow or orange, with a conspicuous dark axial 

 zone behind the peristome. The early whorls are always darker 

 red than those immediately succeeding them. In most instances 

 there is a broad zone of almost confluent spots at the summit. This, 

 however, may be absent. 



This race comes from the Sierras la Penitencia and Infierno and 

 the mogotes near there. 



The type, U.S.N.M. no. 468734, comes from El Cuajani between 

 la Penitencia and El Infierno. It has 4.0 whorls remaining and 

 measures: Length, 25.0 mm; greater diameter, 16.1 mm; lesser diam- 

 eter, 11.3 mm. 



CHONDROTHYRA (CHONDROTHYRA) TOSTA PERTOSTA, new snbspeciei 



Plate 15, Figuke 8 



This race comes from the Hoyo de Jaruco at the summit of the 

 southeastern part of the Sierra de la Chorrera. In it we have the 

 shells much more brilliantly colored than in the typical race; that 

 is, the early postnuclear whorls are yellow and the last one gradually 

 changes to deep orange and finally to the purplish-black banding 

 behind the peristome. There may be also faint axial streaks or 

 stronger markings of dark. 



The race is also somewhat smaller than the typical one. 



The type, U.S.N.INI. no. 367837, has 3.8 whorls remaining and 

 measures : Length, 23.0 mm ; greater diameter, 15.6 mm ; lesser diam- 

 eter, 11.2 mm. 



This subspecies, while it resembles in a way G. {G.) tost a auran- 

 tia, is easily distinguished from this by its less orange coloration and 

 the concentration of the red color to the last part of the last whorl. 



CHONDROTHYRA (CHONDROTHYRA) TOSTA LACTEA, new subspecies 



Plate 15, Figxjee 5 



This subspecies, which comes from the Sierra del Abra, is pure 

 white. There is not the faintest indication of a dark band behind 

 the peristome. 



The type, U.S.N.M. no. 492726, has 4.5 whorls remaining and 

 measures : Length, 24.8 mm ; greater diameter, 17.6 mm ; lesser diam- 

 eter, 11.4 mm. 



