442 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 118 
stripes, but does always have a colored umbilicus. It is very doubtful 
that those referred to by Dall as var. minor, from Sierra Madre, 
Venezuela, belong to any form of poecilus. 
Drymaeus poecilus tricinctus, new subspecies 
PLATE 2, Figure 11 
Shell rimate, with shorter spire than in ictericus, diameter less than 
half of the total length, and last and penultimate whorls three-fourths 
and one-sixth respectively, of the same length. Six whorls, the 
first three yellowish roseate, the following white, with the suture, 
especially in the superior whorls, whiter. ‘Three dark chestnut bands: 
one starting in spots at the third whorl, becoming solid half-way to 
the lip; the second, fused with the suture, wider in the last whorl; 
another shorter, around the umbilical area; the edges of the bands are 
clearer chestnut to yellowish; the three bands are perfectly visible 
inside the aperture, which, like the rest of the shell, is white. A 
ridge or scar is strongly marked on the dorsal side of the last whorl, 
but does not produce divergence of the pattern as in ictericus. Aper- 
ture a little longer than half of the total length of the shell. The shell 
is more narrowly umbilicated than any other form of poecilus. 
Holotype (USNM 307436) from Bolivia (Henderson collection, 
ex R. C. Redfield collection). Another specimen (USNM 609318) is 
from Peru. The holotype measures: Height 26.6 mm., major diam- 
eter 12 mm., minor diameter 11 mm., last whorl 19.8 mm., penult. 
whorl 4.3 mm., aperture 14x4.5 mm. 
None of the many specimens of poecilus seen from Corumba are 
similar; the locality in Bolivia evidently is from the foot of the Cordil- 
lera Oriental to the north. The form has a slight resemblance to 
Drymaeus nigrofasciatus Pfeiffer, but the distinctive characteristics 
are evident. 
Drymaeus poecilus ictericus (Ancey) 
PLATE 2, FIGURE 10 
Bulimulus poecilus icterica Ancey, Journ. Conchology, vol. 7, p. 92, 1892. 
Drymaeus poecilus ictericus, Parodiz, Nautilus, vol. 71, p. 25, 1957. 
Type locality: ‘Province of Matto Grosso, Brazil.”’ 
Even though this subspecies is the most variable of all the forms, 
when the poecilus poecilus and minor have been separated, the problem 
of its identification is in a great part cleared up. It is possible to 
distinguish among specimens of this form some biotopic populations 
or clines which cannot be treated as taxonomic units because they 
present a character gradient. 
This subspecies represents Pilsbry’s ‘red variegated specimens,”’ and 
can be recognized by the pink or sometimes lilac subsutural band 
