78. LTSTEOPHIS. 151 



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



Grosso. 



A-i. d (V. 137 ; C. 41) San Lorenzo, Rio Dr. H. v. Ihering [C.]. 



& $ (V. 147 ; C. 88). Grande do Sul. 



k. Yg. (V. 157 ; C. 47). Brazil. 



i-»i. Hgr. cJ (V. 131; Asuncion, Para- Dr. J. JBohls [C.]. 



C. 36)& 2 (V. 144; guay. 



0.84). 



n. 2 (V. 146; C. 39). S. America. Zoological Society. 



o. Skull. Bahia. 



p. Skull. S. America. 



78. LYSTROPHIS. 



Heterodon, part., Dam. ^ Bibr. Erp. O&n. yii. p. 764 (1854) ; Giinih. 



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



p. 218. 

 Lystrophis, Cope, Proc. Am. Philos. Soe. xxii. 1885, p. 193. 



MaxiUary 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 



pointed 1. dorUgnyi, p. 151. 



Eye in contact with two labials ; scales 



in 19 rows ; ventrals 133-144 ; tail 



pointed 2. Jiistricus, p. 152. 



Eye in contact with two labials ;• scales 



in 21 rows; ventrals 153-173; tail 



rounded off at the end 3. semicinetus, p. 153. 



r^ 1. Lystrophis dorbignyi. 



Heterodon dorbignyi, Dum. Sr Sibr. vii. p. 772 (1854) ; Giinth. Cat. 

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

 ilmsel, Arch. f. Nat. 1868, p. 329 ; Jan, Icon. 06n. 48, pi. iii. 

 figs. 3 & 4 (1876) ; Boettg. Zeitschr. f. yes. Naturw. Iviii. 1885, 



p. 238. 

 Lystrophis dorbignyi, Cope, Proc. Am. Philos. Soc. xxii. 1885, p. 193. 



