2. OPHISAURUS. 283 
4, Ophisaurus gracilis. (Puare XV. fig. 1.) 
Pseudopus gracilis, Gray, Cat. p. 56. 
Dopasia gracilis, Gray, Ann. § Mag. N. H. (2) xii. 1858, p. 389; 
Giinth, Proc, Zool. Soc, 1860, p. 172. 
Ophiseps tessellatus, Blyth, Journ. As. Soe. Beng. xxii. 1853, p. 655. 
Pseudopus gracilis, Giinth. Rept. Brit. Ind. p. 75; Anders. Proce. 
Zool. Soe. 1871, p. 156. 
Lateral teeth conical ; one or two series of teeth on the pterygoids. 
Azygos prefrontal narrower than the greatest width of the frontal, 
usually separated from the latter by two or three prefrontals on a 
transverse series ; interparietal broader than the parietals, as broad 
as or broader than the occipital; three shields on a line from the 
nasal to the azygos prefrontal; five supraoculars. Ear-opening 
distinct, not larger than the nostril. Dorsal plates in fourteen longi- 
tudinal and one hundred to one hundred and ten transverse series, 
keeled; ventrals in ten longitudinal series, smooth. No rudiments 
of limbs externally. Tail about twice as long as head and body ; 
upper caudal scales keeled, lower less distinctly. Brown above, with 
a darker lateral band, and frequently with irregular transverse series 
of bluish, black-edged spots ; lower surfaces pale brownish or yel- 
lowish. 
From snout to vent 12 centim. ; tail 25. The largest specimen, 
with reproduced tail, measures 19 centim. from snout to vent. 
Eastern Himalayas, Khasia hills, Eastern Bengal, Burma. 
a. Ad, Khasia hills. East India Company [P.]. 
(Type. 
b. Ad. Khasia hills. Sir J. Hooker [P.]. 
c-e, Ad. Khasia hills. T. C. Jerdon, Esq. yah 
f-g. Ad. Darjeeling. W. T. Blanford, Esq. [P.]. 
5. Ophisaurus koellikeri. (Prarz XV. fig. 2.) 
Hyalosaurus koellikeri, Giinth. Ann. § Mag. N. H. (4) xii. 1878, 
p. 351. 
Lateral teeth conical ; two series of teeth on the pterygoids, one 
on the palatines. Azygos prefrontal large, quite as broad as the 
frontal, with the entire anterior border of which it forms a suture ; 
interparietal much broader than the parietals or the occipital; two 
shields on a line from the nasal to the azygos prefrontal; five 
supracculars. Ear concealed. Dorsal plates in fourteen longitu- 
dinal and one hundred and twenty transverse series, the median 
obtusely keeled, the laterals smooth; ventrals in ten longitudinal 
series, smooth. Rudiments of hind limbs, as in 0. apus. Upper 
and lower caudal scales keeled. Brownish above, with a darker 
lateral band and small dark-brown spots on the middle line of the 
anterior part of the back ; belly yellowish. 
From snout to vent 13 centim. 
Hab. ? 
. Agr. ? —P (Type.) 
