144 COLUBRID. 
76. CYCLAGRAS. 
Xenodon, part., Dum. § Bibr. Erp. Gén. vii. p. 753 (1854), 
Lejosophis, part., Jan, Arch. Zool. Anat, Phys. ii. 1863, p. 320. 
Cyclagras, part., Cope, Proc. Am. Philos, Soc. 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; subcaudals in two rows. 
South America. 
1. Cyclagras gigas. 
Xenodon gigas, Dum. § Bibr. vii. p. 761 (1854). 
Leiosophis gigas, Jan, Arch. Zool. Anat. Phys. ii. 1863, p. 320, and 
jaye 48, pl. ili. fig. 6 (1876), & 50, pl. ii. figs. 25-27 
Gyalintins 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 prefrontals ; frontal as long as broad, 
much shorter than the parietals; loreal nearly as long as deep; 
a preocular, two postoculars, and three suboculars, separating the 
eye from the labials ; temporals 242; 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, 6 (V..170; C. 87). Para. 
b. o (V. 158; C. 81). Bolivia. M. Suarez [P.]. 
77. XENODON. 
Ophis, Wagl. in Spix, Serp. Bras. p. 47 (1824), and Syst. Amph. 
p- 172 (1880). 
Xenodon, part., Bote, Isis, 1827, p. 540; Schleg. Phys. Serp, ii. p. 80 
(1837); Dum. § Bibr. Erp. Gén, vii. p. 753 ( 1854) ; Giinth. Cat. 
Col. Sn. p. 53 (1858); Jan, Arch. Zool. Anat. Phys. ii. 1863, p. 316. 
Xenodon, Giinth. Ann. § Mag. N. H. (8) 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 
angulate. Tail short or moderate ; subcaudals in two rows. 
Tropical America. 
