NEW SNAILS——PARODIZ 439 
Drymaeus abyssorum (d’Orbigny) 
Helix abyssorum d@’Orbigny, Magasin de Zoologie, vol. 5, p. 15, 1835. 
Drymaeus abyssorum Pilsbry, Manual of conchology, ser. 2, vol. 11, p. 192, 1897. 
Drymaeus abyssorum Parodiz, Nautilus, vol. 71, p. 24, 1957 
Type locality: Pampa Ruiz, between Rio Grande, Valle Grande, and 
Pescado, Bolivia. 
Ancey mentioned this species as occurring in the province of Jujuy, 
in northern Argentina; even if it is scarce in the south we can be sure 
now of the extension of its geographical range; I have seen two lots 
(MCZ and MACN) from Jujuy, and Hylton Scott (Acta Zool. Lillo- 
ana, vol. 10, p. 24, 1951) recorded the species for the same province, 
from the locality of San Pedro. 
Drymaeus oreades (d’Orbigny) 
Heliz oreades d’Orbigny, Magasin de Zoologie, vol. 5, p. 11, 1835. 
Drymaeus oreades, Pilsbry, Manual of conchology, ser. 2, vol. 11, p. 277, pl. 44 
f. 95-96, 1897. 
Drymaeus oreades Parodiz, Nautilus, vol. 71, p. 25, 1957. 
The type locality for this species is “near San Roque,’ Corrientes, 
Argentina, in a damp forest on the south bank of the Rio Santa Lucia 
(about 50 miles from Bella Vista on the Paran4 River). We did not 
find the species when collecting in that region, and it has not been 
recorded from Corrientes since d’Orbigny, so far as known. It is 
probably more abundant in southern Brazil, inasmuch as Pilsbry cited 
specimens from near Sad Paulo, and those examined in the U.S. 
National Museum are also from southern Brazil. 
Drymaeus lynchi Parodiz 
Drymaeus lynchi Parodiz, Comun. Zool. Mus. Hist. Nat. Montevideo, vol. 2, 
no. 27, pl. 1, 1946. 
Drymaeus lyncht Parodiz, Nautilus, vol. 71, p. 25, 1957. 
As I stated in the original description, the type locality ‘‘Pozo de 
Vargas” (collectors E. Lynch and EK. Holmberg 1908), in the zone of 
the “Oriental Cordillera of Bolivia” between Rio Grande and Parapeti, 
is very probably an old toponym no longer in use, inasmuch as it is 
not found in medern maps.! Recently I had opportunity to examine 
many other lots from Corumb4, on the right shore of the Paraguay 
River, Brazil-Bolivia border. All the specimens agree perfectly with 
the original description; this agreement shows that the species has 
an unusual constancy of characters, even in the young, which are so 
variable in other species of the same group. Following are the ten 
Sicgonioniaigeeil find the best map for distribution of this interesting malacological zone in: Lizer, C. A., 
Informe sobre la expedicion al Chaco boliviano, (Boletin Minist. Agricultura, Buenos Aires, vol. 24 p. 26, 
1919), 
