220 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



CHONDROPOMETES (CHONDROTHYROMA) SAGEBIENI DISJUNCTUM, new subspecies 



I'late 11, FiGtmE 2 



The sliell of this subspecies is pale red; the peristome white. It 

 is also inconspicuously spirally banded. 



The type, U.S.X.M. no. 385118, was collected by Bartsch on the 

 mogote off the tip point of Punta de la Sierra. This has 4 whorls 

 remaining and measures : Length, 16.0 mm ; greater diameter, 15.2 

 mm; lesser diameter, 10.7 mm. 



CHONDROPOMETES (CHONDROTHYROMA) CONCOLOR, new species 



Shell small or very small, nnicolor, white or yellow, marked by 

 varicial axial streaks due to the fusion of several riblets, or without 

 these, Nuclear whorls about 2, smooth, inflated, well rounded, finely 

 granulose. The early postnuclear whorls distantly ribbed and the 

 later ones more closely so. Peristome white or yellowish; operculum 

 red. 



This species is closely related to C. {C.) scopuloriim but differs from 

 it by the red or reddish operculum. It ranges from the Mogotes de 

 Fonte southeast of the Sierra de San Andres and Sierra Guacamayas 

 to the Sierra GalahSn and some mogotes south of these mountains. 

 It occurs therefore west of C. (C.) scopidorum. 



We recognize five subspecies in the material before us, wdiich the 

 following key will help to differentiate : 



Distribution of the subspecies of C {€'.) concolor is shown iii 

 figure 76. 



KEY TO THE SUBSPECIES OF CHONDROPOMETES (CHONDROTHYROMA) CONCOLOR 



Shell pale orange concolor 



Shell straw-color. 



Spiral threads in umbilicus obsolete magister 



Spiral threads in umbilicus not obsolete. 



Greater diameter less than 12 mm fontei 



Greater diameter more than 13 mm spe 



Shell not straw-color. 



Shell flesh-color carnicolor 



CHONDROPOMETES (CHONDROTHYROMA) CONCOLOR CONCOLOR, new subspecies 



Plate 11, Figure 6 



Shell pale orange: peristome white; operculum red. Axial ribs 

 rather distantly spaced; spiral threads in the umbilicus rather feeble. 



The type, U.S.N.M. no. 468723, a complete specimen from the low 

 land of the eastern part of the Sierra Guacamayas, has 5.6 whorls and 

 measures: Length, 17.0 mm; greater diameter, 15.7 mm; lesser 

 diameter, 10.8 mm. 



