Zoological Miscellany. 
65 
2. Homalopsis australis, n. s. Slate black, in spirits : under lip and be- 
neath white ; throat with 2 oblong black streaks, underside with 2 series of 
large, square, black spots, united by a rather broad, black, central streak : 
tail black beneath : anterior frontal small, triangular, hinder rhombic: ver- 
tebral moderate, ovate ; occipital small, scale-like ; loreal square. 
Inhabits North Coast of New Holland; Port Essington, Mr. Gilbert. 
The hinder scales of the lower series next the abdominal plates and on 
the side of the vent smooth, with a very strong elevated keel. Loreals 2 : \ or 
2 rudimentary scales under the eyes : anterior frontal divided : loreals small : 
1 rudimentary inferior ocular : 2 anterior f rentals P 
3. Homalopsis Hardwickii. Olive, with black-edged, pale, narrow, often 
interrupted cross bands : head pale, with an anterior triangular spot, and a 
broad streak up the side of the face enclosing the eyes : chin and beneath 
yellow: sides black dotted: the 16 or 17 hinder scales of the lower series 
keeled, and marked with a brown ring near their tip on the front half of the 
disk, and. the three scales on each side of the vent with a similar transverse 
ridge. 
XVI. Helicops. Head ovate, indistinct, shielded: anterior frontal tri- 
gonal, between the nasal plates; superciliaries small; occipital elongate ; 
upper labial entire ; loreal distinct: body fusifoim ; scales (19 rows) trun- 
cated, keeled : tail tapering. American. 
* Scales truncated and keeled on the ends. 
1. Helicops carinacaudus, Wagl. Amph. t. 7. Col. ceneus, Lechst. MSS. 
Pseuderyx, Fitz. Homalop. carinacauda, Schlegel, Phy. Serp. 350, t. 13, 
fig. 18, 19. 
Inhabits Central America. Mus. Leyden. 
** Scales sharply keeled, end truncated and nicked. 
2. Helicops angulatus, Wagler. Col. angulatus, Lin. Homalopsis angu- 
iatus, Boie. Natrix aspera, Wagler. Col. Surinamensis, Shaw. 
Inhabits Brazils. Mus. Leyden. 
XVII. Dimades. Head indistinct; crown shielded; anterior frontal 
small ; loreal none ; vertical superciliaries and occipital plates large ; 
mental small ; upper labial plates entire, the third and fourth under the eye : 
body thick ; scales keeled ; tail conical, American. 
* Scales keeled, in \9 rows ‘ anterior frontal plate transverse. Tail short. 
\. Dimades plicatilis. Col. plicatilis, Lin. Homal. plicatilis, Schle- 
gel, Phy. Serp. t. 13, fig. 21, 23. 
Var. Col. serratus, Merrem. 
Inhabits Central America. Mus. Leyden. 
** Scales truncated and keeled at the end, in \9 rows : anterior frontal 
plate triangular, between the nasal. Tail long. 
2. Dimades Leopardina. Homal. Leopardina, Schlegel, 359. 
Inhabits ? Mus. Leyden. 
The two latter genera are nearly allied to Tropidonotus ; they are sepa- 
rated from it by the form of the nostril. 
