1. ILYSIA. 133 



1. ILYSIA. 



Tortrix {non Linn.), part., Oppel, Ordn. Rcpt. p. 65 (1811); Schliy. 



J'/ii/s. 8erp. ii. p. 1 (1837). 

 Aiiiliiif, part., Oken, Lvhrh. Natury. iii. p. 283 (ISK!). 

 Ilysia, part., Ilcnipn'ch, Grimdr. d. Nutury. (1820)*: Fitziny. N. 



Class, livpt. p. 2(5 (182(i). 

 Torquatri.x, jiart., Ilmrortli, Phil. May. Ixv. 1825, p. 372. 

 Torquatrix, (iray, A>ni. I'/iil. x. 1825, p. 209. 



Ilysia, IVayh'i; Icon. Amph. (1828), and Syst. Amph. p. 193 (1830). 

 Tortrix, Dum. ^- Jiibr. Erp. Gen. vi. p. 584 (1844); Gray, Cat. Sn. 



p. 113 (1849) ; Jan, Icon. Gen. Ophid. p. 54 (1865). 



Toetli modenUc, subcqual, 9 or 10 in cacli maxillary ; small teeth 

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

 eyo extremely small, with ronnd pupil, in an ocular shield ; lar<ie 

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

 forms a suture with its follow behind the rostral ; no loreal, pra)- 

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

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

 short and blunt. 



tSouth America. 



1. Ilysia scytale. 



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



S. N. i. p. 391 (17G0) ; Laur. 8yn. liept. p. 70 (17U8) ; Laud. 



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



aunulata, Laur. I. c. p. G9. 



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



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



cserulea, Laur. I. c. 



atra, Laur. I. c. 



Tortrix scytale, Oppel, Ordn. liept. p. 56 (1811); Schley. Phys. Serp. 



ii. p. 5, pi. i. figs. 4 & 5 (1837), aiid Abbild. p. 110, pi. xxxiii. 



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



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



coraliiuis, Opj>el, I. c. 



Ilvsia scytale, Lichtenst. Verz. DouU. Mus. Berl. p. 104 (1823); 



' Wayle'r, Icon. Amph. pi. v. fig. 2 (1828). 

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



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

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

 supraocular and parietal subcqual in size, and scarcely larger than 

 the scales on the back of the head ; five or six u])pcr labials, third 

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

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

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

 sometimes edged with brown. 



Total length 830 mUlim. 



Guianas and Upper Amazon. 



* Tho iiutlior has not been ablcto refer to this work. 



