INNOCUOUS SERPENTS. 
153 
the hot and temperate regions of both worlds, but they have 
not hitherto been observed in New Holland. They rarely 
attain a large size. 
1. PsAMMOPHis Lacertina. Size larger, and form 
more heavy than in the other species. It is easily recog- 
nised by its scales having a hollowed groove, and at the 
summit of the head being concave, and separated in the 
form of a casque. Vertical plate very narrow; anterior 
frontals and occipitals small ; above olive-brown or green- 
ish, ornamented with 5 ranges of spots ; below yellowish ; 
labial and mental plates with broad green spots. S. 
189 + 80. Inhabits most of the countries bordering on 
the Mediterranean. 
2. PsAMMOPHfs Moniliger. Of a less size, and less 
robust make than the preceding. Head less broad and 
more depressed ; greenish-brown or olive-green, with a 
yellow dorsal ray ; often two similar rays on the sides. 
The plates of the head ornamented with large obsolete spots. 
Varies extremely both in the form and the system of its 
colour. S. 136 to 170 + 62 to 125 : from 15 to 17 rows 
of smooth scales. Country, all Africa, even to the Levant. 
The southern point of that continent produces a great num- 
ber of varieties of this species, and an analogous race is 
found in the Isle of France. 
3. PsAMMOPHis PULVERULENTA. Of Very Small size; 
tail very short ; grooved teeth, extremely large ; head co- 
nical ; muzzle convex, and rather short ; vertical plate 
very narrow ; reddish-yellow, varying to brown and to 
black ; head rayed with black ; a dark-coloured dorsal ray 
accompanied by a row of alternate spots. The tints vary 
in different individuals. S. 153 + 54. Bengal, Sumatra, 
and Java. 
4. PsAMMOPHis Seychellensis. Head slender and de- 
pressed ; muzzle truncated ; 17 ranges of lanceolate and 
strongly carinated scales. Deep brown, varied with al- 
ternate black and white spots ; a pale ray bordered with 
black passes from the lips to the sides of the neck. S. 188 
+ 107. 
5. PsAMMOPHis Antillensis. Shape slender ; habit of 
Ps. Moniliger ; head broad and conical ; muzzle termi- 
