278 CLASS XV. 



Trunk cylindric, covered above with smootli, imbricate scales. 

 Abdominal and subcaudal scutes narrow. 



Ilysia Hempe., Fitz., Lichtenst. [Tortrix 0pp., Cuv., 

 Mere.). Maxillarj teeth conical, thick, curved backwards; 

 palatine teeth less. Spurs at the vent, contained in a cavity open 

 by a small foramen on each side near the vent. Abdominal scutes 

 small, scarcely distinct from scales. Tail very short, below, with 

 scutes undivided. 



Cylinch'oplds Wagl., Dum. and Bibr. Eyes surrounded by scutes. 

 Intermaxillary bone edentulous. 



Sp. Ilysia maculata Lichtenst., Anrjuis maculata L., Mus. Ad. Fnd. Tab. 

 11, fig. 3, GUER. Iconogr., Rept. PI. 19, fig. i, Ceylon; Ilysia rufa 

 LiCHTENST.j Tortrix rufa Mere., Seba Thesaur. 11. Tab. 25, fig. i, &c., 

 Java, Borneo, Bengal. 



Ilysia Wagl., Tortrix Dum. and Bibr. Eyes in the middle of 

 scute. Intermaxillary bone furnished with teeth. 



Ilysia scytale Hempe., Anguis scytaJe L., Seba Thes. 11. Tab. 73, fig. 3, 

 Linn. Mus. Ad. Frid. Tab. vi. fig. 1, Schlegel Ahhild. Tab. 33, fig. i, 

 cranium, figs. 2 — 4, Diet. univ. d'Hist. nat., Rept. PI. 8, fig. i ; Surinam, 

 a very common species in collections. 



Note. — That the name Tortrix Oppel {Die Ordnungen, Familien und Gat- 

 tungen der ReptiUen, Miinchen, 18 11, p. 55) should be changed for Ilysia, 

 is recommended by the more familiar use of the same name in Entomology, 

 already authorised by Linnaeus. See above. Vol. i. p. 395. 



Xenopeltis Reinw. Head depressed, narrowed anteriorly, trun- 

 cated. A second vertebral scute interposed between the two occipital 

 scutes resembling large scales. Upper jaw protracted beyond lower. 

 Teeth setaceous, sharp, numerous, set upon intermaxillary bone, 

 both jaws and palate-bones (superior maxillary bone thin, styli- 

 form). Scales flat, broad, hexagonal, subimbricate. Spurs at vent 

 none. Tail short, conical, covered below by divided scutes. 



Sp. Xenopeltis unicolor Reinw. (and Xen. leiicocephala), Tortrix Xenopeltis 

 ScHLEG. Ahb. Tab. 35, Guer. Iconogr., Rept. PI. 21, fig. 3, (the head). 

 From the Sunda Isles. 



Family XIII. RJimopJies s. Hyperolia. Head scutate, not 

 distinct from trunk, small, with snout acuminate. Maxillary 

 teeth ; palatine teeth none. Eyes small, occupying the middle of 



