78. LYSTROPHIS. LoL 
g. Yg. (V.147; C. 41). Corumba, Mato  S. Moore, Esq. [P.}. 
Grosso, 
h-i. 8 (V. 187; C. 41) San Lorenzo, Rio Dr. H. vy. Ihering (C.]. 
& 2 (V. 147; C. 38). Grande do Sul. 
k. Yg. (V. 157; C. 47). Brazil. 
i-m. Her. ¢ (V. 1381; Asuncion, Para- Dr. J. Bohls [C.]. 
C. 36) & @ (V. 144; guay. 
C. 34). 
n. 2 (V. 146; C.39), SS. America. Zoological Society. 
o, Skull, Bahia. ; 
p. Skull. S. America. 
78. LYSTROPHIS. 
Heterodon, part., Dum. § Bibr. Erp. Gén. vii. p. 764 (1854) ; Giinth. 
oe Sn. p. 82 (1858) ; Jan, Arch. Zool. Anat. Phys. 11. 1864, 
inetaophis, Cope, Proc. Am. Philos. Soc, xxii. 1885, p. 193. 
Maxillary very short, shorter than ectopterygoid, with 4 or 5 
small teeth, followed, after an interspace, by a pair of strongly enlarged 
fangs; mandibular teeth subequal. Head scarcely distinct from 
neck; snout very short, projecting, cuneiform ; rostral very large, 
trihedral, with sharp A-shaped edge, produced posteriorly in a 
narrow branch separating the internasals ; eye moderate, with round 
pupil. Body subcylindrical ; scales slightly oblique, smooth, with 
apical pits, in 19 or 21 rows; ventrals obtusely angulate laterally. 
Tail short ; subcaudals in two rows. 
Southern parts of South America, east of the Andes. 
Synopsis of the Species. 
Eye usually separated from the labials 
by a series of suboculars ; scales in 
21 rows; ventrals 131-147; tail 
RT ee aregrt aie cet eb syeratchaie? ale isa 21 1. dorbignyi, p. 151. 
Eye in contact with two labials; scales 
in 19 rows; ventrals 133-144; tail 
MOMED ©, fates Vide eee wo canoe mesirecus, P. 152. 
Eye in contact with two labials; scales 
in 21 rows; ventrals 153-173; tail 
rounded off at the end ...........- 3. semicinctus, p. 153. 
1. Lystrophis dorbignyi. 
Heterodon dorbignyi, Dum. § Bibr. vii. p. 772 (1854); Giinth. Cat. 
p. 83 (1858); Jan, Arch. Zool. Anat. Phys. ii. 1863, p. 221 ; 
Hensel, Arch. f. Nat. 1868, p. 329; Jan, Icon. Gén. 48, pl. ii. 
figs. 3 & 4 (1876); Boetty. Zeitschr. f. ges. Naturw. lviii. 1885, 
p. 233. 4 
Lystrophis dorbignyi, Cope, Proc. Am. Philos. Soc, xxii. 1885, p. 193. 
