132 



Mr. Gray then proposed to divide the Saurians into the following 

 five sub-divisions : 



1. Pachyglosste, or thick -tongued Lizards, including, 1st. the Noc- 

 turnal, or family of the Geckoes ; and, 2nd. the Diurnal, as the 

 Chameleons and Agamas of the Old World, and the Guanas (Igua- 

 nidcs) of the New World. 



2. Leptoglossa, or slender-tongued Lizards, including three sec- 

 tions characterized by the form of the tongue, containing, 1 . the fami- 

 lies of Lacertidee, Zonuridce, Cercosaurida, Cherocolidce, Chamasaurida, 

 Helodermid(e ; 2. Monitor idee ; 3, Scincida. 



Mr. Gray then laid before the Society a catalogue containing a 

 list of the Slender-Tongued Saurians in the collections of the Bri- 

 tish Museum and the Zoological Society, and the descriptions of 

 many new genera and species. 



Mr. Gray afterwards exhibited from the collection of the Earl of 

 Derby a new Fox from Senegal, and a very young specimen of Ge- 

 netta Senegalensis, which he remarked corresponded exactly with 

 the adult animal in the peculiar form of the naked band on the soles 

 of the hind feet. 



The new fox he designated as 



C. Vulpes dorsalis, (the Senegal Fox). Fur greyish-white, va- 

 ried with black tips to the hairs ; face rather j^ellowish ; fore and 

 hind limbs rather pale foxy ; back with a dark brown dorsal streak, 

 varied with black ; chin and belly whitish ; tail rather slender, black 

 tipped : length of body and head 15, tail 8 inches. The black tips 

 of the hairs form indistinct spots on the sides of the back, a streak 

 on the upper part of the base, and a black tip to the tail, where there 

 are a few elongate white hairs. There is a very narrow black streak 

 on the front of the fore legs. This species is very like the small In- 

 dian fox, (V. Bengalensis, Gray,) and the C. Caama of Dr. Smith, 

 but it is smaller, and has a less bushy tail, and a distinct dorsal 

 streak, not found on either of them. It has not the black lips, nor 

 the black spot on the hinder edge of the thighs of the Cape species. 



The Earl of Derby having forwarded to the Society a number of 

 interesting birds, with a view to their exhibition at one of the sci- 

 entific meetings, Mr. Gould, at the request of the Chairman, re- 

 marked upon such of them £is were especially worthy of notice, and 

 pointed out one new species of Grouse belonging to Mr. Swainson's 

 subgenus Lyurus, which Mr. Gould characterized as 



Lyurus Derbianus. Lyu. vertice, collo, corporeque supra me- 

 tallice nigrescenti-cyaneis, nitide brmineo, fasciatis et irroratis; 

 tectricibus alee majoribus ad bases et apices albis; caudd nigra, 

 rectricibus extemis brunneo irroratis ; corpore subtiis nigrescenti- 

 brunneo, alho brunneoque irrorato; crisso albo ; femoribus albis ; 

 (arsis obscure brunneis; rostro digitisque brunneis. 



Long. tot. unc. 15; rostri, 1 ; ate, 9; cauda, 7; tarsi, 2. 



Obs. The subgenus Lyurus has been separated from Tetrao by 

 Mr. Swainson, and in this species the tail very closely approximates 



