CERASTES CORNUTUS. 331 
Males with horns. 
1 (J . Assiut. 
2 J . Suakin. Surgeon-Captain R. H. Penton, D.S.O. 
Hornless males. 
2 (J . Luxor. 
1 S ■ Wadi Haifa. Major Henry d' Alton Harkness. 
1 $ . Ras Gharib. Mr. James Robertson. 
Females with horns. 
1 $ . Desert east of Suez Canal. 
1 $ . Desert at Gizeh Pyramids. 
1 2 . Desert, Luxor. 
3 ?. Plain of Suakin. Colonel Sir C. Holled Smith, K.C.M.G., C.B. 
Hornless females. 
5 5 . Desert, Luxor. 
Hornless, sex unknown. 
1. Luxor. 
1. WaVli Haifa. Major Henry d' Alton Harkness. 
1. Ras Gharib. Mr. James Robertson. 
Snout broad and short, its length considerably less than the breadth between the 
eyes superiorly and anteriorly; rostral transversely linear, its height equalling about 
one-third of its breadth, deeply concave from side to side above its lower border; nasal 
plate small, separated from the rostral and first labial by generally two rows of scales ; 
nostril directed upwards and backwards ; a slightly enlarged scale above the nasal ; 
nasals separated by six or seven scales ; fifteen to twenty scales between the orbital 
margins superiorly ; eye moderately large, its diameter considerably less than one-half 
the length of the snout, separated from the upper labials by about five rows of scales ; 
fourteen to eighteen scales' round the eye ; an erect, furrowed, sbghtly backwardly 
curved appendage above each orbit, equal to about the length of the snout, present 
or absent ; usually a pair of juxtaposed enlarged rounded scales on the mesial line 
of the head slightly anterior to the eyes, and another similar pair on the occipital 
region, each scale with a strongly pronounced, central, tubercularly conical eminence ; 
scales on the upper surface of the head generally unequal, small, more or less round, 
with a short tubercular keel. 12-15 upper labials ; one pair of large oval chin-shields, 
separated by loose skin, in contact with three labials ; 28 to 35 rows of scales across the 
body. 130-165 ventrals (Egypt 140-151); anal single, rarely or partially divided; 
subcaudals 28-42 (Egypt 29-40), more or less obtusely keeled posteriorly, terminal 
scale conical. General colour sandy yellow, either nearly uniform or with 30 to 36 
rows of dark brown spots, either in four or six oblique or transverse series, frequently 
confluent and in some producing a checkered appearance, the pale interspaces in some 
2u2 
