DIVERS AND GREBES 297 



with greyish-white ; the upper parts blackish- 

 brown, the feathers margined with ash grey. The 

 tail and quills brownish-black, glossed with green ; 

 fore-part of neck greyish-white, faintly marked with 

 grey, the cheeks also ; lower sides of neck streaked 

 with grey. Lower parts pure white, with the ex- 

 ception of a grey-brown band across the hind-part 

 of the belly. The feet dusky externally, buffish 

 flesh colour internally ; membranes flesh-coloured. 

 Length, from bill to end of tail, thirty-one inches. 



THE BLACK-THROATED DIVER. 



(Colymbus arcticus.) 



MALE. The bill is black, two inches and a half 

 in length ; iris red. The upper part of the head 

 and the hind-neck are light grey ; fore-part and 

 sides of head darker ; fore-neck purplish-black, 

 ending below angularly, having a band of inter- 

 rupted white above ; the sides and lower part of 

 the neck in front are dusky, streaked with white. 

 The upper parts are black, glossed with green in 

 front, shaded with brown behind. There are two 

 dorsal bands of square white spots ; the scapulars 

 have larger spots of white. The lower parts of the 

 body are white, with a lengthened band of dusky 

 on the sides. The legs and feet are grey blue 

 externally and light flesh-coloured internally ; the 

 membranes or webs are flesh-coloured. Length, 

 from bill to end of tail, twenty- eight inches. 



FEMALE. Similar to the male but smaller, the 

 length from bill to tail being twenty-five inches. 



