170 
SOME ISTEUESTING liEI'TILES 
oraiige-coloni'oil. This marking seems to he dejjendent on colours prevailing in its habitat. 
At Wau there is a large <iiiantity of ferruginous rock of an orange-red tint, which is more or 
less covered with green grass and foliage. The lizards in (juestion delight to sit upon this 
rock, liasking in tlie sun or watching for an opportunity of licking up some fly that settles 
near. In this position the lizards are easily overlooked, for with their orange tails and 
posterior half of the body lying on the rock and tlie green anterior half of the body slightly 
raised, and perlia])s looking through some green grass, there is a very perfect illustration of 
protective resemhla)ice. Whether this colouring of the lizard is peculiar to Wau or not 
I cannot say, foi’ 1 have not seen the reptile elsewhere, hut in any case at this place the 
lizard seems to be distinctly protected on account of the resemblance between its own 
colouring and that of its surroundings.’’ 
Chantcrleon 
gracilis 
Ch.\MJ5LEONS 
('liiii)ifrle(in (jrarilia, Ilallowell 
A half-grown male of this species, which has not been previously recorded, from the 
Egyptian Sudan, though it is common at Gondokoro, likewise from Wau. 
Sn.\kes 
Triipidiiiidfus (ilinirriin, Peters 
Several specimens from Wau. 
Hoddiiii liiipiifiot, Dumeril and Bihron 
A young specimen from Wau, September 23rd, 1907 -belonging to the longitudinally 
striped form—body uniformly light brown aljove. This is the “.Taggar” snake, believed 
to be highly poisonous by the natives of many disti'icts of Africa. Perhaps this opinion 
has been caused by the very strong, but solid, fangs of the upper jaw. All specimens 
known to me from the Sudan are referable to the var. Cipmocuhiris, Gthr., especially 
distributed in East Africa, but the markings of the head are more as in the South and 
West African specimens. 
('Idarophis eiiiuii, Giinther 
Tw'o specimens from Barboi, Upper White Nile, November Cth, 1907. Ventrals, 189; 
subcaudals 90 pairs (tail incomplete), and ventrals 188; subcaudals 132 pairs. There is 
no longer any doubt on my part that this snake does not occur so far north as Khartoum, 
as l)elieved by Anderson. 
(iraijia tli(dhiui, Mocquard 
Mocquard, BhU. Hoc. Fhilom., Paris (8), IX., 1896-7, page 8. 
Boulenger, Ann. }Fhh. Hoikjo (I.), II., 1, page 9, Plate III., fig. 3. 
This species, originally described from the French Congo by Mocquard, afterwards 
from the Congo State (Lake Tanganyika), as G. faKciata by Boulenger, has since been 
found at Entebbe, Victoria Nyanza, and at Polkom, Sobat, but is new for the Egyptian 
Sudan. Dr. Wenyon got two specimens at Barboi, south of Taufikia, White Nile; both 
are males. Ventrals 135-170; subcaudals (?) (tail mutilated in both specimens, as 
frequently in the long-tailed species of Graijia). From snout to vent., 565 mm. 
Greyish-olive above, the scales edged laterally with white, most of the lateral scales 
with a black spot at the tip ; yellowish l)elow, the ventrals laterally with a black spot 
at their posterior margin. Labials broadly edged with black. Young with dark cross-bars. 
The number of ventrals varies, according to the communications of my friend 
Boulenger, from 135 (Entelibe, Barboi) to 143 (Tanganyika, Polkom) ; the number of 
