74 
REPTILIA. 
posterior oculars. Scales in lifteen series, on the anterior half of the back 
elongate, lanceolate, on the posterior rhombic, many with a single apical 
pore. They are smooth, with the exception of those forming the series next 
to the vertebral series j these are provided with a strong keel, the keels 
forming a pair of raised lines along the middle of the back. Anal bifid. 
The maxillary teeth become gradually stronger posteriorly j none are grooved. 
— i>. bUineata, sp. n., pi. 6. fig. B, Costa Rica. 
Hapsidophrys niger^ sp. n., Gunther, 1. c. p. 26, Gaboon. 
Gonyosoma margantatum (Ptrs.) figured in Ann. Mus. Genov, iii. Taf. 6. 
%. a 
Ti'opidonotus, A direct comparison of the typical specimens 
by Prof. Peters has shown that 
1. T, maculatus (Edeling, 1864) = T. sundanensis (Gthr. 
1865) == T. maculatus (Ptrs. 1871, and Ann. Mus. Genov, iii. 
p. 36) ; and that 
2. T. sarawacensis, Gunth. Proc. Zool. Soc. 1872, p. 596, 
also Zool. Rec. vii. p. 84, is a distinct species, which the 
Recorder has erroneously confounded with the former. 
Tropidoiiotus Jtaviceps (D. & B.) = T. leucomelas (Gthr.) = Amphiesma 
lindmanni (Blkr.) = A. rufotorquatum (Edeling). Gunther, P. Z. S. 1872, 
p. 690. 
Tropidonotus conspicillatus, sp. n., Gunther, 1. c. p. 696, fig. 4, Borneo. 
Tropidonotus. The snake noticed by Studer, and said to be new to Swit- 
zerland (see Zool. Rec. vii. p. 74), is described by Ratio under the name of 
Trcypidonotus fallax, Faiine Suisse, iii. p. 163. 
Tropidonotus tessellatus figured by Fatio, 1. c. p, 166, pl.l. 
Tropidonotus ferox (Gthr.) is not the T. mortuarius of Baudin. GUnther, 
A, & M. N. II. 1872, ix. p. 27. 
Tratanorhinus nigroluteus (Cope) = Ilelicops agassizi (Jan). Giinther, 
I, c. p. 27. 
Camastes quincundatus (Jan) figured by Jan and Sordelli, part 38, 
pi. 1. fig. 1. . 
Hydrops lubricus, sp. n.. Cope, Proc. Ac. Philad. 1871, p. 217, Mexico. 
Hydrcethiops^ g. n. Natric., GUnther, A. & M. N. H. 1872, ix. p. 28. Body 
stout, cylindrical \ form of the head as in Homalopsis. A single anterior 
and two posterior frontals. Nostrils on the upper surface of snout, narrow 
slits between two nasals. Scales keeled, sliort, in twenty-three series ) anal 
and subcaudals divided. Loreal present. Maxillary teeth in an uninter- 
rupted series, slightly increasing in length posteriorly, numerous and closely 
set, none grooved. — H. melanogaster^ sp. n., pi. 3. fig. G, Gaboon. 
Homalophis dori<$ (Ptrs.) figiued, Ann. Mus. Genov, lii. Taf. 5, fig. 2. 
Miralia alternans (Reuss) = Raclitia indica (Gray) = Rhabdion borneensis 
(Blkr.). Gunther, P. Z. S. 1872, p. 590. 
Psammophidcs, Messrs. Jan and Sordelli (1. c.) figure in part 34: — Cte/o- 
peliis oxyt'hynchus, C. insigmius, C.porrectus, ^QXi\^s=zWiamphiuphis rostratus, 
Ptrs.], and C, [.P] productus, Jan, Psammopkis sibilans, P. irregidaris, and 
P. crucifer. 
