78. LT8TROPHI8. 151 



y. Yg. (V. 147 ;C. 41). Corumba, Mato S. Moore, Esq. [P.J. 



G rosso. 



h i. rf (V. 137; C. 41) San Lorenzo, Rio Dr. H. v. Ihering[C.l 



& $ (V. 147 ; C. 38). Grande do Sul. 



k. YK. (V. i:>7:C.47). BrazU. 



/ m. \\ft. J (V. 1.31; .Asuncion, Para- Dr. J. Bohls TC.1 



C. 38) & $ (V. 144 ; guay. 



C. 8 



n. $ (V. 146; C. 30). S. America. Zoological Society. 



i'. Skull. Bahia. 



l>. Skull. S. America. 



78. LYSTROPHIS. 



Heterodon, part., Dum. Sf Bibr. Erp. Gtn. vii. p. 704 (1854) ; Giinf/i. 



Cat. Col. Sn. p. 82 (1858) ; Jan, Arch. Zool. Anal. Phys. ii. 1864, 



.p. 218. 

 Lystrophis, Copt, Proc. Am. Philot. 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 pita, 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 



pointed 1. dorbignyi, p. 151. 



Eye in contact with two labials ; scales 



in 19 rows ; ventrals 133-144 ; tail 



pointed 2. histricus, 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. 



Hefcrndon dorbignyi, Dum. $ Bibr. vii. p. 772 (1854) ; Gii*t*. Col. 



p. 88 (1858); Jan, Arch. Zool. Anat. Phys. ii. 1863, p. 221 ; 



Heruel, Arch. f. Nat. 1868, p. 329 ; Jan, Icon. Gin. 48, pi. iii. 



figs. 3 & 4 (1876) ; Boettg. Zeitschr. f. yes. Natwrw. Iviii. 18f >, 



Y. :>38. 

 Lystrophia dorbignyi, Cope, Proc. Am. Phtio*. Soc. xxii. 1885, p. 193. 



