2 R. Lydekker — Aberrant Dentition of Felis Tigris. [No. 1, 



black at the base, but with a broad tip of ferruginous or rich chestnut, 

 lower rump and upper tail coverts the same. Quills black ; a broad white 

 band, formed by the whole of the median coverts, and the basal portions of 

 the greater coverts, together with the outer edges of the last 3 or 4 secon- 

 daries (tertiaries of some writers), traverses the wing longitudinally. Tail 

 black. Beneath, there is a white spot in the middle of the throat, in 

 contact with the rich ferruginous tint of the breast, abdomen and lower 

 tail coverts, which are the same colour as the rump ; axillaries white, 

 under wing coverts black and white mixed, inner margins of quills 

 dusky grey. Wing, 3-5 ; tail, 2*95 ; tarsus, 0-93 ; culmen, 0*62 ; bill from 

 front, 0-4. 



Female. Olive brown above, forehead, lores and sides of head paler 

 and more rufous ; rump, upper tail coverts and basal |)ortion of all the tail 

 feathers, except the middle pair, ferruginous ; central rectrices and terminal 

 portion of all the others black, rather browner than in the male however ; 

 quills brownish black with paler brown edges, and a white bar over the 

 wing as in the male. Chin, throat, breast, sides of abdomen and flanks 

 rufescent brown with an olive tinge ; a white spot, as in the male, in the 

 centre of the throat ; middle of the abdomen paler, lower tail coverts pale 

 rufous. Wing 3-2, tail 2-8. 



Of course I have no means of ascertaining certainly that the female 

 is correctly identified, as the birds were obtained by Mr. Mandelli's collec- 

 tors, but the white breast-spot leaves very little doubt on this head. As 

 regards the locality, the only information Mr. Mandelli can give me is 

 that these birds wex'e obtained in Tibet in the month of November 1875. 



II. — Aberrant Dentition of Felis Tigris. — B^ R. Lydekker, B. A. 



(Read 6th February, 1878.) 



(With Plate II.) 



In the accompanying plate (No. II), there is represented the right 

 ramus of a mandible of an individual of Felis tigris which was killed in 

 British Burma ; this jaw is remarkable in that it carries an additional 

 premolar. The normal number of lower molar teeth in the genus Felis is 

 three, namely, two premolars, which are respectively the penultimate and 

 idtimate of that series, and one true molar, which is the first of the latter 

 series, and which is often known as the " carnassial tooth." 



In the figured specimen, there is between the canine tooth and the pe- 

 nultimate premolar, a small and simple tooth, which is the ante-penultimate 



