PODICIPES NIGRICOLLIS. 307 



360. Podicipes grriseig;ena(Boddaevt). The Red-necked Grebe. 

 " This bird is less common near Tangier than the last, being 



seldom observed on passage. Some remain in the country to 

 breed, the others migrating northwards in March, returning 

 again during September. They are more abundant at the lakes 

 of Ras el Doura, and are there called Mazan by the Arabs." 

 Favier. 



Some specimens of the Red-necked Grebe obtained in Morocco 

 by Favier were so young that they must have been bred in the 

 country ; and we saw many at the above lakes in April, but I 

 have no record of them on the Spanish side. 



In summer. Crown, nape, back of neck black ; chin and throat grey ; 

 neck in front chestnut-red ; no tippet ; bill black, base of bill yellow. 

 In winter. Neck in front grey ; no eye-stripe. Length 16^ inches. 



361. Podicipes auritus (Linnaeus). The Lesser Crested or 



Slavonian Grebe. 



Although Favier has not mentioned this Grebe as occurring 

 near Tangier, I have seen one specimen obtained in the Straits 

 in October, 1867 ; it probably is often to be met with in winter. 



Bill straight. 



In summer. With tuft of lengthened chestnut feathers on each side of 

 head from bill to nape ; crown, forehead, chin, and ruff or tippet black ; 

 neck and flanks chestnut. 



In winter. As in last. Length 13 inches. 



362. Podicipes nigricollis, C. L. Brehm. The Black-necked 



or Eared Grebe. 



This species is the most common of the Grebes, breeding in 

 lagoons and swamps on both sides of the Straits. In the winter 

 they take to the salt water, and are generally plentiful in 

 Gibraltar Bay. 



Bill slightly curved upwards ; inner four primaries white throughout. 



In summer. Head and neck black, with a stripe from eye to nape of 

 lengthened golden-reddish feathers. 



In winter. Resembles last in plumage, except the white on primaries. 

 Length 12 inches. 



x2 



