55. LYTORHYNCHUS, 415 
IL. Rostral shield separating the internasals; one pair of chin- 
shields ; no lubial entering the eye. 
NS DS rere tie Cee 4, decurtatus, p. 417. 
1. Lytorhynchus diadema. 
Heterodon diadema, Dum. § Bibr. vii. p. 779 (1854) ; Gervais, Mém. 
Ac, Montpellier, iii. 1857, p. 511, pl v. fig. 1. 
. Simotes diadema, Giinth. Cat. p. 26 (1858); Strauch, Erp. Aly. 
p- 53 (1862); Boettg. Ber. Senck, Ges, 1878-9, p. 6). 
Lytorhynchus diadema, Peters, Mon. Berl. Ac. 1862, p. 272, pl. —. 
fig. 1; Be . Tr. Zool. Soe. xiii, 1891, p. 145. 
Chatachlein diadema, Jan, Arch. Zool. Anat. Phys. ii. 1863, p. 228, 
and Icon. Gén. 10, pi. vi. fg. 2 (1865). 
Catachlena diadema, Blanf. Proc. Zool. Soc. 1881, p. 678, fig. 
Snout moderately long; rostral angularly bent, with straight 
horizontal edge, detached on the sides, the portion visible from 
above as long as its distance from the frontal; no lateral cleft in 
the rostral; suture between the internasals much shorter than that 
between the prefrontals ; frontal nearly as long as its distance from 
the end of the snout, slightly shorter than the parietals; a small, 
squarish loreal ; one or two preoculars, with or without a subocular 
below; two postoculars; temporals 1+2 or 2+3; seven or 
eight upper labials, fourth, fifth, or fourth and fifth, entering the 
eye; three lower labials in contact with the anterior chin-shields ; 
posterior chin-shields as long as or a little longer than the anterior, 
and separated from each other by two series of scales. Scales smooth, 
in 19 rows. Ventrals 160-188; anal divided; subcaudals 36-46, 
Pale buff or cream colour above, with a series of large transversely 
rhomboidal dark spots; a dark median band along the head and 
nape, sometimes confluent with an interocular transverse band; an 
oblique dark band from the eye to the angle of the mouth; lower 
uniform white. 
Total length 450 millim. ; tail 60. 
Algerian and Tunisian Sahara, Egypt, Nubia, Arabia, Syria, 
Persia. 
a. ¢ (V. 162; C. 44). = Algeria. 
b. & (V. 165; C, 40), Pyramids of Gizeh. Dr. J. Anderson [P.). 
e. Yg.(V. 164; C.42). Abou-Roash, W.of Dr, J. Anderson Py 
d. 2 (V. 182; C. 43). Muscat, Arabia. a SO aaaehas, Esq. 
e. 2 (V.188; C.36).  Bushi, S, Persia. Fe 
2. Lytorhynchus ridgewayi. 
Lytorhynchus ridgewayi, Bouleng. Ann. § Mag. N. H. (5) xx. 1887 
pala. Boettg. Zool. Jahrb. iii. 1888, p. 924 ; Boule. Tr. Line. 
. (2) v. 1889, p. 102, pl. xi. fig. 1. 
4S 
’ Hy. 
y= yy 
