b MR. J. LEWIS BOXnOTE ON 



mai^k bordering the white of the back of the thighs. Forehead 

 a darker and richer colour than the neck and cheeks, a few white 

 hairs betAveen the horns. The whole of the upper side of the 

 nose from the preorbital glands to the nostrils snow-white like 

 the chin. The glands themselves and the area round the eye 

 creamy white or very pale fawn. No black on the legs or feet ; 

 the glandular tufts below the knees present as in all the examples 

 of G. rvjifrons that had been exhibited in the Gardens. 



Text-fiff. 



Head of Red-fronted Gazelle, G-asella rujifrons liasleri. 



This Gazelle differed from all previously described specimens of 

 G. rujifrons in the whiteness of tlie upper side of the nose. 



Mr. J. LE^^as BoxHOTE, M.A., F.L.S., F.Z.S., exhibited living 

 specimens of Rats {^Mus i^attus) which he had bred in the course 

 of his experiments and which showed the "waltzing" character 

 well known in a variety of the domestic mouse, but which had 

 not hitherto been recorded in rats. 



The oiiginal stock from which these rats had been bred was 

 caught wild at Giza near Cairo (see P. Z. S. 1910, p. 664), and the 

 experiments were being conducted to study heredity in two 

 varieties found in a wild state, namely, Mus ratt'us tectorum with 

 pure white underparts, and Miis raitus alexandrinus, in which 

 the hairs of the underpai'ts were entirely slate-colovired or 

 had slate-coloured bases. The expeiiments were also being 

 conducted to test the inheritance of a fawn-coloiued individual 

 which had appeared as a "sport" in the first generation from 

 pure wild parents (P. Z. S. 1910, p. 638). With regard to the 

 heredity of the two normal varieties the white-bellied form {M. r. 

 tectoruin) was found to be apparently a simple Mendelian 

 dominant to the dark-bellied form (il/. r. uhxandrhms). the 



