132 



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

 five sub-divisions : 



1 . Pachyglossa, or thick-tongued Lizards, including, Ist. the Noc- 

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

 Chameleons and Agamas of the 01d World, and the Guanas (Igua- 

 nidčB) of the New World. 



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

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

 lies oi Lacertida, Zonuride, Cercosauridce, CherocoUda, C/iam<Esaurid(E, 

 HelodermidtE ; 2. Monitoridce ; 3, Scincidce. 



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

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

 tish Museum and the Zoological Society, and the descriptions of 

 many new genera and species. 



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

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

 netta Senegalensis, 'vvhich he remarked corresponded exactly with 

 the adult animal in the peculiar fonn 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 Tvuth black tips to the hairs ; face rather yellowish ; 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 verj^ narrow black streak 

 on the frontof the fore legs. This species is very likę 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 onthe hinder edge of the thighs of the Cape species. 



The Earl of Derby having forwarded to the Society a niimber 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 as 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, colio, corporegtie supra me- 

 tallice 7iigrescenti-cycmeis, nitide hrunneo, fasciatis et irroratis; 

 tectricibus alce majoribus ad bases et apices albis; candd nigrd, 

 rectricibus externisbrunneo irroratis; corpore subtiis nigrescenti- 

 brunneo, albo brunneogueirrorato; crisso albo ; femoribus albis; 

 tarsis obscurė brunneis; rostro digitisgue brunneis. 



Long. tot. unc. 15; rostri, 1 ; al(B, 9; caudcB, 7; tarsi, 2. 



Ois. The subgenus Lyurus has been separated from Tetrao by 

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



