302 
THE REPTILES OF EGYPT. 
there is only one shield, divided only below the nostril. In the nasals of the Suakin 
snakes the loreal, so to speak, is projected into them, so that there is an emargination 
of the posterior border of the hinder nasal for its reception. 
Analysis of portion of table referring to P. schokari, Forskal. 
VentralB. 
Subcaudals. 
177-194 
110-138 
Sind to Persia. 
168-185 
129-149 
Maskat, Hadramut, and Aden. 
168-179 
103-119 
Vicinity of Suez. 
173-177 
113-123 
Lower Egypt. 
192 
116 
Island of Shadwan. 
176 
114 
Ras Gharib. 
195 
111 
Assuan. 
188 
113 
Oasis of Kbargeh. 
162-174 
93-106 
Suakin and Durrur. 
190 
120 
Khartum. 
179-183 
119-131 
Duirat and Biskra. 
Examples of this species from Aden have a greater number of subcaudals, and those 
from Suakin and Durrur a smaller number, than is present in those from other localities. 
I have included in the foregoing table, in order to bring out their differences, the 
two Asiatic species P. leithii and Taphrometopon lineolatum, which have not 
unfrequently been mistaken for P. schokari. 
Psammophis sibilans, Linn. (Plate XLIII. and fig. 12 in text.) 
Serpens africana, Seba, Thes. ii. 1735, p. 57, tab. 56. fig. 4; Lacep. Serp. ii. 1789, p. 246, 
pi. xii. fig. 1. 
No. 30 Anguis scutis abd. CLIX vel CLX, sq. caud. C, Linn. Amceu. Ac. i. 1749, p. 302. 
Coluber sibilans, Linn. Syst. Nat. ed. x. 1758, p. 222; part., Syst. Nat. i. 1766, p. 383. 
Coluber moniliger, Daud. Hist. Rept. vii. 1803, p. 69. 
Coluber (Natrix) sibilans, Merr. Syst. Amph. 1820, p. 114. 
Couleuvre, Savigny, Descr. de l'Egypte, Rept. Suppl. pi. iv. (1813 ') figs. 5 i-5 3. 
La Couleuvre oreillard, Is. Geoff. St.-Hil. Descr. de l'Egypte, Hist. Nat. i. 1827, p. 145, pi. viii. 
figs. 4-4/. 
Coluber auritus, Is. Geoff. St.-Hil. op. cit. p. 151, pi. viii. figs. 4-4'. 
Psammophis sibilans, Blgr. Cat. Snakes B. M. iii. 1896, p. 161 ; id. Ann. Mus. Civ. Genova, (2) 
Although the fourth Suppl. plate of Reptiles bears the date 1813, no reference is made to it by 
Is. Geoff. St.-Hilaire, whose description of C. auritus was written after 1820, as is gleaned from the scattered 
references in his text to Merrem's work before and after his account of O. auritus. In Merrem there is no 
reference under C. (N.) sibilans to the ' Descr. de l'Egypte.' 
