28 



having the fourth (Hf;;it of each foot longer thau the third, so it 

 cannot possibly fall under that division of the genus with the 

 oci-ipital not enlarged, in which the third digit is longer than the 

 fourth. On the other hand, the Agama sinaita, Ileyden, has the 

 third digit on both fore and hind limbs longer than the fourth. 



It seems probable that plate 5. figs. 3 and 4, viz. Merrem's 

 A. mutahilis, may be the lizard described by Reuss, from Upper 

 Egypt, under the name of A. inennis, which, I believe, is the 

 species Mr. Blanford ' bad in view as the one to which be also 

 would restrict the use of Merrem's name onutahiJis. 



I have examined the types of A. sinaita, Heyden, and A. are- 

 naria, Heyden, preserved in the Prankfort Museum. The type 

 of the former is a male with no gular pouch, and with ?ix large 

 prgeanal pores, i. e. wath the same number as occurs in the spe- 

 cimens in the British Museum referred to A. arenaria. The 

 dorsal scales are small and imbricate, but feebly so, of very uni- 

 form size but very regularly decreasing in dimensions towards 

 the sides, where they are very small, yet still feebly imbricate. 

 They are quite smooth on the anterior part of the body, but the 

 scales on the limbs and sacral region appear to have beeu keeled, 

 but only feebly so. The features of tliis individual are the small 

 size of the dorsal scales, the regularity of their arrangement, their 

 little imbrication, and their generally hexagonal form. The 

 scales on the ventral surface are almost as large as the central 

 line of scales on the back, and are smooth, or feebly keeled, here 

 and there. The scales ou the outsides of the limbs are con- 

 siderably larger thau any of those on the body, are strongly 

 imbricate, and markedly keeled. The limbs are long and slender, 

 and the third digit of both limbs is the longest. The scales on 

 the top of the head are large, juxtaposed, and smooth, aud there 

 is a spine at the posterior margin of tlie ear. The nostril is 

 placed slightly above the canthus rostralis, and looks upwards 

 and backwards. The naked ear is larger than the eye-opening. 

 The tail is laterally compressed, and the scales are strongly 

 keeled. The coloration is completely faded. Habitat : Arabia 

 Petrsea. 



A. arenaria, Heyden, is represented in the Frankfort Mnseum 

 by the two types from Upper Egypt presented by Eiippell. 

 They do not appear to me to differ from A. sinaita, except iu 



1 Eastern Persia, ii. Zool. k Geol. ISTCi, p. .TIG. 



