NEW SNAILS—PARODIZ 443 
and umbilical region; the other spiral bands are brown and very 
narrow. ‘This variety is more solid and heavy than any other; young 
specimens are yellowish. All are from Matto Grosso at Corumba, 
and are never found in eastern Bolivia or northern Argentina. Many 
specimens agree perfectly with Ancey’s description, but some popu- 
lations are very variable in color; these variations seem to be the 
result of gradation between two extremes, as follows: 
(a) Typical ictericus, always with sutural bands pink and the other 
bands pale brown. No black bands, and the pink-lilac umbilical area 
is not margined with black. 
(b) Atypical form, with the sutural band very dark, sometimes 
black, which continues to the umbilicus edging the pink area. Other 
spiral bands are often very dark, too, with pink, yellow, or light-brown 
zones in between. 
Between the two extremes we can find all kinds of combinations. 
Probably there is interbreeding not only among these populations, but 
also with those of form minor at the extreme eastern range; d’Orbigny’s 
figures 5 and 9 are among these variations. 
There is one lot (CM 62.1070) which resembles D. lynchi in pattern 
(only two individuals), but they are shorter and solid and are tinted 
with pink outside, inside, and over the umbilical area. 
A peculiar feature, more evident in ictericus than in any other sub- 
species, is the strong scar on the last whorl, behind the aperture, that 
looks like an anomaly or fracture of the shell. This scar is a perma- 
nent characteristic in 75 percent of the specimens of typical ictericus, 
and in 50 percent of the populations. This scar produces a divergence 
in the colored pattern; in poecilus poecilus it is rare, and when present 
only slightly noticeable. 
Drymaeus poecilus percandidus Dall 
Drymaeus poecilus percandidus Dall, Smithsonian Misc. Coll., vol. 59, no. 14, p. 3, 
1911. 
Specimens (USNM 250245) are from north of Santa Ana and 
Ollantaytambo, Peru. Larger form, with more convex whorls; en- 
tirely white and different from those of Matto Grosso (Dall distin- 
guished also 10 ‘‘mutations,”’ all from Peru, very difficult to identify). 
Never found with the other southern subspecies; inasmuch as its 
author did not mention any comparisons, it may be a different species. 
Drymaeus andicola (Pfeiffer) 
Bulimulus andicola Pfeiffer, Proc. Zool. Soc. London, pt. 14, p. 115, 1846. 
Bulimulus (Bostryx-Lissoacme) andicola Pilsbry, Manual of conchology, ser. 2, vol. 
10, p. 166, 1896. 
Type localty: “Andes of Bolivia.” 
