X44 COL0BRID.E. 



76. CYCLAGRAS. 



Xenodon, part., Bum. ^ Bibr. Erp. Gen. vii. p. 75.3 (1854). 

 Leiosophis, part., Jan, Arch. Zool. Anat. Phys. ii. 186.3, p. 320. 

 Cyclagras, part., Cope, Proc. Am. Pkilos. Son. xxii. 1885, p. 185. 

 Maxillary teeth 18, the last two very strongly enlarged and 

 separated from the others hy a short interspace ; mandibular teeth 

 snbequal. 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 ; veutrals rounded. Tail 

 rather long ; subcaudals in two rows. 

 South America. 



1. Cyclagras gigas. 



Xenodon gigas, Dm?h. ^- Bibr. vii. p. 761 (18o4).__ 



Leiosophis gigas, Jan, Arch. Zool. Anat. Phys. ii. 186.3, p. 320, and 



Icon. Gen. 48, pi. iii. fig. 6 (1876), & 50, pi. ii. tigs. 25-27 



(1881). 

 Cyclaoi-as gigas, Cope, Proc. Am. Philos. Soc. xxii. 188.5, p. 185. 



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

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

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

 a prteocular, 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 

 1.53-170 ; 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 lono-itudinal series of brown dots or small round spots. 



Total length 2050 millim. ; tail 550. 



Argentina, Brazil, Bolivia. 



a. ^ (V. 170; C. 87). Para. 



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



77. XENODON. 



Ophis, War/l. in Sjn.v, Serj). Bras. p. 47 (1824), ajid Syst. Ainph. 



p. 172 (1830). 

 Xenodon, part., Boie, Isis, 1827, p. 540 ; Schley. Phys. Serp. ii. p. 80 



(1837); Dim. %■ Bibr. Erp. Gin. vii. p. 753 (1854); Giinth. Cat. 



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

 Xenodon, Giinth. Ann. Sr May. N. If. (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 ; ventrals rounded or obtusely 

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



Tropical America. 



