63 



like the same sex of C. calcarifer, and other allied species, it has 

 a tarsal spur. 



There can be no doubt that this species is very closely allied 

 to G. calcarifer, Peters, which is found at no great distance to the 

 south of Temen, viz. in the neighbourhood of Aden. The leading 

 characters distinguishing the present species from C. calcarifer, 

 Peters, are the great vertical elevation of the creat posteriorly, the 

 little development of the occipital lobe, and the backward, but 

 little upward, prolongation on to the crest of the supraorbital 

 ridge. The crests and occipital lobes, however, of chameleons 

 vary considerably, and C. vulgaris, Daud., is a very good illus- 

 tration of this. In the other features the two are practically 

 the same. The occurrence, therefore, of two so closely related 

 forms in such near geographical relationship suggests the possi- 

 bility, in view of the variations just mentioned, that, as the areas 

 they inhabit are better explored, links connecting the one with 

 the other may ultimately be discovered, but until this has 

 happened the two must be kept distinct. 



Meptiles from Aden collected hy Captain O. G. Nurse. 



Captain C. G-. Nurse has lately presented four species of 

 Eeptiles from Aden to the British Museum, and I am indebted to 

 Mr. Boulenger for permission to enumerate them here. They 

 are the following : — Semidactylus yeriurii, Anders. ; Uromastix 

 (Aporoscelis) lenti, Anders. ; Chamceleon calcarifer, Peters ; 

 and Glaucoma nu/rsii, n. sp. 



The Hemidactylus and Chamteleon call for no remark. 



LAOEETILIA. 



TJeomastix (Apoeoscelis) benti, Anderson. 



One c? and one juv. 



These two lizards have a wonderful resemblance at first sight 

 to Uromastix ornatus, Heyden, but they are at once distin- 

 guished from it by the absence of prseanal and femoral pores. 

 In those species which have these structures they are always 

 present even in very young individuals, but although in these 

 two specimens there are no traces of them, both have a line of 

 enlarged scales along the thighs in the position occupied by 

 these structures, and more or less callose, but structurally quite 



