1. ILTSIA. 133 



'-f- 1. ILYSIA. 



Tortrix {non Linn.), part., Oppel, Ordn. Rept. p. 55 (1811); Schleg. 



Phys. Serp. ii. p. 1 (1837). 

 . Anilius, part., Oken, Lehrb. Naturg. iii. p. 283 (1816). 

 Ilysia, part., Hemprich, Grundr. d. Naturg. (1820) * : Fitzing. N. 



Class. Sept. p. 26 (1826). 

 Torc[uatrix,'part., Haworth, Phil. Mag. Ixv. 1825, p. 372. 

 Torquatrix, Oray, Ann. Phil. x. 1825, p. 209. 



Ilysia, Wagler, Icon. Amph. (1828), and Syst. Amph.y. 193 (1830). 

 Tortrix, Dum. Sf Bibr. Hip. Oin. vi. p. 584 (1844) ; Oi-ay, Cat. Sn. 



p. 113 (1849) ; Jan, Icon. Qin. Ophid. p. 64 (1865). 



Teeth, moderate, subequal, 9 or 10 in each maxillary ; small teeth 

 in the praemaxillary. Head very small, not distinct from neck ; 

 eye extremely small, with round pupil, in an ocular shield ; large 

 symmetrical shields on the head ; nostril in a single nasal, which 

 forms a suture with its fellow behind the rostral ; no loreal, prae- 

 ocular, or postocular ; no mental groove. Body cylindrical ; scales 

 smooth, in 19 or 21 rows ; ventrals feebly enlarged. Tail extremely 

 short and blunt. ' 



South America. 



~V- 1. Ilysia scytale. 



Anguis scytale, Linn. Mus. Ad. Frid. p. 21, pi. vi. fig. 2 (1754), and 



S. N. i. p. 391 (1766) ; Laur. Syn. Eept. p. 70 (1768) ; Baud. 



JRept. vii. p. 302, pi. Ixxxvii. fig. 1 (1803). 



annulata, Laur. I. c. p. 69. 



fasciata, Laur. I. c. p. 70 ; Daud. I. c. p. 306. 



corallina, Laur. I. c. p. 71. 



cserulea, Laur. I. c. 



atra, Laur. I. c. 



-==^ Tortrix scytale, Oppel, Ordn. Mept. p. 56 (1811) ; Schleg. Phys. Serp. 



ii. p. 5, pi. i. flga. 4 & 5 (1837), and Abbild. p. 110, pi. xxxiii. 



figs. 1-4 (1844) ; Dum. ^ Bibr. vi. p. 585 (1844) ; Gray, Cat. Sn. 



p. 114 (1849) ; Jan, Icon. Gin. p. 55, pi. iii. (1865). 



coralinug, Oppel, I. c. 



Ilysia scytale, Liehtenst. Verz. Doubl. Mus. Berl. p. 104 (1823) ; 



Wagler, Icon. Amph. pi. v. fig. 2 (1828). 

 Torquatrix scytale, Gray, Ann. Phil. x. 1825, p. 209. 



A pair of very large praefrontals ; frontal rather small, longer 

 than broad, usually in contact with a nearly equally large occipital ; 

 supraocular and parietal subequal in size, and scarcely larger than 

 the scales on the back of the head ; five or six upper labials, third 

 and fourth in contact with the ocular. Scales in 19 or 21 rows. 

 Ventrals 210-244 ; anal entire ; subcaudals 9-14. Bed (yellowish 

 in spirit), with more or less complete black annuli ; the dorsal scales 

 sometimes edged with brown. 



Total length 830 millim. 



Guianas and Upper Amazon. 



* The author has not been able to refer to this work. 



