21(} 



paler or darker chestnut, more or less conspicuously or iucouspi- 

 cuously lightened with goldeii cinnamon-rufous (hazel), the latter tinge 

 being sometimes restricted to the centre or the posterior portion of 

 tlie mantle, or to the centre of the crown, or represented only by 

 a distinct brighter "wash" of the general chestnut colour of the 

 mantle and crown (Big Tambelan, 101,649, '50, paratypes ; Tioman, 

 8.1.25.2, 8.2.25.2; Great Kedang, 11.1.30.4, 5. 6, 7, 2,060; Perhentian, 

 2,048, "50). When even this remnant of a lirighter tinge has nearly 

 or entirely disappeared, we arrive at specimens with nearly or quite 

 uniform dark chestnut-seal-brown mantle and crown (Big Tambelan, 

 101,651, paratype; Perhentian, 11.1.30.1, 2, 2,047). 



AKE ALL THE SPECIMENS REFERABLE TO ONE RACE? 

 The question must Ije answered decidedly in the affirmative. In 

 the case of a form so variable in colour as that have under consider- 

 ation it would, of course, require a very large series of specimens from 

 each of the six islands represented to give the actual proof that the 

 variations in colour are precisely the same in each place. But, 

 although the series from this point of view is wholly inadequate, there 

 is still ample evidence that the specimens are representatives of one 

 indivisible race. In order to give the reader an idea of the variations 

 of colour exhil)ited, in the present series, from each island, the 

 following method has been adopted (the single alcoholic specimen 

 from P. Aor is, in this connection, left out of consideration, because 

 it is not before me at the moment of WTiting these lines) : 



(1) Colour of back.- — The darkest-backed extreme (least ad- 

 mixture of grey) in the whole series of specimens, irrespective of 

 locality, is called 1, the lightest-backed (largest admixture and 

 lightest tinge of gi*ey) 15, the intermediate stages 2-14. It will be 

 found, then, that the following stages are represented : 



From Big Tambelan Islands : 1, 6 and 13 ; 



From P. Tioman : 6 and 8 ; 



Fi'om Lantinga : 10 (unusually strongly suffused with pale mars- 

 brown) . 



From Great Kedang : 2, 3, 6, 8, 9, 10, 11, 11 and 15 ; 



From Perhentian : 2, 2, 2, 4, 4, 6 and 7. 

 The Redang series, it will be noticed, gives an approximately 

 complete view of all the stages of the colour of the back. In the 

 smaller series from Perhentian (situated nearest Great Eedang) 

 only the darker half of the scale of modifications happens to be 

 represented. The single specimen from Lantinga and the two from 

 Tioman show three different medium stages, the three from Tambelan 

 the extremes (approximately) and one of the medium stages. There 

 cannot be much doubt, therefore, that a longer series from each island 

 would show an identical series of modifications of the colour of 

 the back. 



(2) Colour of under-parts. — No. 1 indicates the lightest. No. 15 

 the darkest colour of the under-parts, Nos. 2-14 the intermediate stages. 



