114 A MONOGRAPH OF THE PHEASANTS 



Two species of Argusianus are certainly known, and a third is suspected on the 

 evidence of a single feather in the British Museum : 



Malay Argus Pheasant Argusianus argus (Linne). 



Bornean Argus Pheasant Argusianus gray i {E,\X\o\). 



Double-spotted Argus Pheasant Argusianus bipunctatus (Wood). 



KEY TO THE FORMS OF ARGUSIANUS 



I. Central tail-feathers enormously elongated ; a speckled reddish band on the primaries (males). 

 a The primary band on inner web only. 



a' Lighter plumage markings buff ; upper breast dull chestnut argus. 



b' Lighter plumage markings white ; upper breast orange rufous .... grayi. 



b The primary band on both webs ........... bipunctatus. 



n. Central tail-feathers not greatly elongated ; no speckled band on primaries (females). 



a Collar dull chestnut ; ventral plumage rufous ........ argus. 



b Collar bright rusty red ; ventral plumage buff grayi. 



