57 



1891, p. 210 ; Boetl ger, Ber. Senck. Ges. 1879-80, p. 194; Boutan, 

 Eev. Biol, du Nord de la Prauce, v. 1893,p. 336, fig. 1. 



Ptyodactylus oudrii, Lataste, Le Natural. 1880, p. 299 ; Boutan, 

 Eev. Biol. Nord France, v. 1893, p. 343, fig. 2. 



Ptyodactylus lacazii, Boutan, Arch. Zool. Exper. (2) x. 1892, 

 p. 17. 



Ptyodactylus UscJioffsheimi, Boutan, Eev. Biol. Nord France, 

 V. 1893, p. 340, pi. iii. fig. 1. 



Ptyodactylus montmahoui, Boutan, I. c. p. 369, pi. iii. fig. 2. 



Ptyodactylus harroisi, Boutan, I. c. p. 375, pi. iii. fig. 3. 



Ptyodactylus puiseuxi, Boutan, I. c. p. 379, pi. iii. fig. 4. 



Ptyodactylus lohatus, snbsp. syriacus, Peracca, Boll. Mus. 

 Torino, ix. 1894, no. 167, p. 1. 



Ptyodactylus lohatus, var. oudrii, "Werner, Verh. zool.-bot. G-es. 

 Wien, 1894, p. 76; Boettger, Zool. Centralblatt. June 1894,p. 376. 



2 <S . Hadir el Kabir near Medina. 



1 juv. Dar Tadda between Medina and El Wisb. 



These two males present some resemblances in their general 

 form to the indi^ iduals of this species found on the plains of Suez, 

 but differ from them in their much more pointed snouts, in the 

 presence of enlarged tubercles on the tWghs and on the tibiae, 

 and in their tails being distinctly depressed. Two types of 

 nostril are met with in this species in the Nile Valley — one in 

 wliich it is so much raised above the snout as to merit the term 

 tubular being applied to it, and another in which the scales 

 defining the opening are only distinctly swollen. In the former 

 type, the nostril is surrounded by the first labial and three nasals, 

 while, in the simply swollen kind, it is enclosed by the rostral, 

 first labial, and three nasals. The individuals from the Hejaz 

 have nostrils of the latter type, but not so swollen as to entitle 

 tbem to be called semitubular. In the geckoes of the Plain of 

 Suez (2 specimens only), the nostrils are semitubular, and are 

 formed by the first labial and three nasals. Individuals in the 

 Nile Valley proper, with the nasal formula, rostral, labial, and 

 three nasals, have more or less depressed tails like the Hejaz 

 geckoes, while those in the former region, with the formula 

 L.3N., have rounded tails. There is, however, another important 

 character distinguishing them, and it is this, that tlie granules 

 of the body are more or less carinate wbile those on the snout 

 are distinctly keeled. 



