144 COLUBKID^. 



-^ 76. CYCLAGRAS. 



Xenodon, part., Bum. ^ Bibr. Erp. Gin. vii. p. 753 (1854). 

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

 Cyclagras, part., Cope, Proc. Am. Philos. Soe. xxii. 1885, 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 ; suboaudals in two rows. 



South America. 



1. Cyclagras gigas. 



Xenodon gigas, Bum. ^ Bibr. vii. p. 761 (1854).__ 



Leiosophis gigas, Jan, Arch. Zool. Anat. Phys. ii. 1863, p. 820, and 



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



(1881). 

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



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

 uasals much shorter than the prsefrontals ; frontal as long as broad, 

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

 a prffiooular, 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 ; suboaudals 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. <S (V. 170 ; 0. 87). Para. 



h. S (V. 158; C. 81). Bolivia. M. Suarez [P.]. 



77. XENODON. 



Ophis, Wagl. in Spiv, Serp. Bras. p. 47 (1824), and Syst. Amph. 



p. 172 (1830). 

 Xenodon, part., Boie, Isis, 1827, p. 640 ; Schleg. Phys. Serp. ii. p. 80 



(1887); Bum. Si' Bibr. Erp. Gin. vii. p. 753 (1854); Gilnth. Cat. 



Col. Sn. p. 58 (1858) ; Jan, Arch. Zool. Anat. Phys. ii. 1868, p. 816. 

 Xenodon, Gunth. Ann. Sf Mag. N. S. (8) xii. 1868, p. 353. 

 Acanthophallus, Co2}e, 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 ; ventrals rounded or obtusely 

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



Tropical America. 



