114 THE REPTILES OF EGYPT. 
than all the others, is still more pronouncedly like A. tournevillii, even although its 
scales are unequal and more or less mucronate, as its head is long and pointed, with 
the snout very gradually sloping, the lower jaw being decidedly underhung. It 
has also the markings of A. tournevillii. All the other specimens, however, have short, 
broad and cordate heads like A. Jiavimaculata, but in them also similar markings to 
those of A. tournevillii are present. Unfortunately there is only one example of the 
latter species in the British Museum, and I cannot with it only as my guide refer 
A. tournevillii to A. flavimaculata. In an adult male of the latter from Medina, 
longitudinal brown bands occur as in those of the young specimen I have described, 
and exactly resembling those of A. tournevillii, and moreover their continuation on 
to the sides of the body can be detected although much obscured by their increased 
breadth and the presence of pale yellow spotted scales. On the mesial line of the 
back also, as in the type of the species, there are five or six white spots, the remains, 
as it were, of the pale dorsal areas of the young. My impression is that with further 
materials it will be possible to lead directly from typical A. flavimaculata into 
A. tournevillii through these eastern Egyptian lizards, the proportions of whose digits, 
as in typical A. Jiavimaculata, are the same as in A. tournevillii. The latter will 
thus probably prove to be the Western Saharian modification of the Arabian lizard. 
A. tournevillii is provided with a single row of prseanal pores ; but while no pores 
have been present in any of the typical examples of A. flavimaculata examined by me, 
these Eastern Egyptian males, as has been mentioned, show a tendency, extremely 
feeble it is true, but still present in one or two, to the formation of callose scales. 
A. flavimaculata is closely allied to A. jayakari, but the latter is distinguished from 
the former by its large, regular, strongly keeled and mucronate scales, and by its less 
cordate head, which is considerably shorter than the tibia. 
Agama spinosa, Gray. (Plate X. figs. 2 & 3.) 
Agama spinosa, Gray, Griffith's An. King. ix. 1831, Syuop. p. 57, plate ; Blgr. Cat. Liz. B. M. i. 1885, 
p. 355; Ann. Mus. Civ. Genova, ser. 2, xvi. (xxxvi). 1896, p. 550; Parenti e Picaglia, Rett, ed 
Anfibi Mar Rosso, 1886, p. 18; Boettger, Kat. Rept. Mus. Senck. 1893, p. 51 ; Zool. Auz. xvi. 
1893, p. 114. 
Agama colonorum (non D. & Bibr.), Ruppell, Neue Wirbelth. 1835, p. 14, pi. iv.; Mus. Senck. iu\ 
1845, p. 302 ; Gray, Cat. Liz. B. M. 1845, p. 256 ; Blanford, Zool. Abyss. 1870, p. 449 
Agama mutabilis, Lefebvre, Abyss, vi. p. 198, pi. ii. fig. 2. 
6 J, 3 J 1 , and 1 juv. Hills behind Suakin. 
4 $ and 5 ? . Erkowit, Suakin. 
Body elongate ; head rather small, somewhat depressed ; nostril tubular, directed 
