144 



COLUDUID.E. 



76. CYCLAGRAS. 



Xenodon, part., Dum. $ Bibr. Erp. Gen. vii. p. 753 (1864). 

 Leiosophis, part., Jan, Arch. Zool. Anat. Phys. ii. 1863, p. 320. 

 Cyclagras, part., Cope, Proc. Am, Philos. Soc. xxii. 1886, p. 185. 



Maxillary teeth 18, the last two very strongly enlarged and 

 separated from the others by a short interspace ; mandibular teeth 

 subequal. Head distinct from neck ; eye moderate, with round 

 pupil ; a series of suboculars. Body moderately elongate, cylindrical ; 

 scales smooth, with apical pits, in 19 rows ; ventrals rounded. Tail 

 rather long ; subcaudals in two rows. 



South America. 



1. Cyclagras gigas. 



Xenodon gigas, Dum. fy Bibr. vii. p. 761 (1854). 



Leiosophis gigas, Jan, Arch. Zool. Anat. Phys. ii. 1863, p. 320, and 



Icon. G6n. 48, pi. iii. fig. 6 (1876), & 60, pi. ii. tigs. 25-27 



(1881). 

 Cyclagras gigas, Cope, Proc. Am. Philos. Soc. xxii. 1885, p. 185. 



Rostral nearly as deep as broad, just visible from above ; inter- 

 nasals much shorter than the praefrontals ; frontal as long as broad, 

 much shorter than the parietals ; loreal nearly as long as deep ; 

 a praeocular, two postoculars, and three suboculars, separating the 

 eye from the labials ; temporals 2 + 2 ; eight upper labials ; four or 

 five lower labials in contact with the anterior chin-shields, which 

 are a little longer than the posterior. Scales in 19 rows. Ventrals 

 153-170 ; anal entire ; subcaudals 60-87. Yellowish or reddish 

 brown above, with broad black cross bands or rings ; a black stripe 

 from the eye to the side of the neck ; anterior part of belly with 

 three longitudinal series of brown dots or small round spots. 



Total length 2050 millim. ; tail 550. 



Argentina, Brazil, Bolivia. 



a. J (V. 170-; C. 87). Para. 



b. d (V. 158 ; C. 81). Bolivia. M. Suarez [P.]. 



77. XENODON. 



Ophis, Waff 1. in Spix, Serp. Bras. p. 47 (1824), and Syst. Amnh. 



p. 172 (1830). 

 Xenodon, part., Bote, Isis, 1827, p. 540 ; Schleg. Phys. Serp. ii. p. 80 



(1837); Dum. $ Bibr. Erp. Gen. vii. p. 753 (1854); Gilnth. Cat. 



Col Sn. p. 53 (1858) ; Jan, Arch. Zool. Anat. Phys. ii. 1863, p. 316. 

 Xenodon, Gilnth. Ann. fy Mag. N. H. (3) xii. 1863, p. 353. ' 

 Acanthophallus, Cope, Am. Nat. 1893, p. 482. 



Maxillary short, with 6 to 15 teeth, followed, after an interspace, 

 by a pair of very strongly enlarged fangs ; mandibular teeth sub- 

 equal. Head distinct from neck ; eye large, with round pupil. 

 Body cylindrical or depressed ; scales disposed obliquely, smooth, 

 with apical pits, in 19 or 21 rows ; veutrals rounded or obtusely 

 angulate. Tail short or moderate ; subcaudals in two rows. 



Tropical America. 



