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PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 85 



not fixed for isolated mogotes but appear to be present in each of 

 them, that is, definite subspecific characters associated with definite 

 mogotes are not present. 



The specimen figured, U.S.X.M. no. 367761, comes from Mogote 

 Capon. It has lost most of the nuclear turns; the 5 whorls remain- 

 ing measure: Length, 20.3 mm; greater diameter, 13.4 mm; lesser 

 diameter, 10.0 mm. 



HENDERSONINA (HENDERSONIDA) DISCOLORANS BICOLOR. new subspecies 



Pl^vtb 13, Figure 10 



Shell averaging smaller than //. [H.) discolorans dlscolorans and 

 having the last whorl much oftener adnate than that subspecies. The 

 base in this is also always darker than the rest of the last whorl. 



/IS^^"- 





^ 

 ^ 



iO. 



F.nt« 



Figure 81. — Distribution of the .sub.species of Hrntlcrxoniua (Hendcrsonida) discolorans: 

 (1) discolora7is ; (2) bicolor; (3) decolor. 



The type. U.S.N.M. no. 492715, comes from the south side of the 

 Sierra San Andres. It has 5 whorls remaining and measures: 

 Length, 17.0 mm; greater diameter, 11.8 mm; lesser diameter, 8.3 mm. 



This subspecies we know from the south side of the Sierra San 

 Andres and some of the mogotes to the south and southeast of this 

 ranire. 



HENDERSONINA (HENDERSONIDA) DISCOLORANS DECOLOR, new subspecies 



Platr 13, Figure 8 



A large series of specimens from the Mogote de Fonte, southeast 

 of the Sierra Guacamayas look as if they were partial albinos; they 

 are uniformly pale yellow with white peristome. They are also 

 smaller than the other two races. The extreme tip has a dark spot. 



