Birds of Gran Canaria. 507 



path, but Lave obtained extensive views of this part of tlie 

 island both from the Pinar and the sea ; the country looks 

 very uninteresting, and I should imagine that bird-life is 

 jjoorly represented, being practically confined to Kavens 

 and the Birds-of-Prey, save in the few fertile valleys where 

 the species already mentioned may be met with. The entire 

 coast-line from Mogan to Sardina is rugged in the extreme, 

 liigh cliffs, where several pairs of Ospreys have their strong- 

 hold, dropping sheer into the sea. On the north-west corner 

 of the island, between Agaete and Gaidar, lies an extensive 

 and arid plain, but in the neighbourhood of Gaidar itself 

 and the adjoining town of Guia the plains are well watered 

 and yield large crops of bananas, tomatoes, and sugar-cane. 

 As might be expected, the birds found in this region mostly 

 resemble those in Division I. 



The principal woiks bearing on the subject to whicli re- 

 ference is made in my paper are contained in the follov.ing 

 list:— 



Webb, EerUielot, aud Moquin-Taiidon, Hist. Nat. des lies Canaries 



(OiTiithologie Cauarieiiiie), 18-41. 

 Bulle, J. f. O. 18-57, pp. 258-292 and pp. 305-3ol. 

 Meade- Waldo, Ibis, 1889, pp. 1-13. 



„ Ibis, 1893, pp. 187-207. 



Tristram, Ibis, 1889, pp. 13-32. 

 Hartert, Nov. Zool. 1901, pp. 313-335. 

 Polatzek, Orn. Jabrb. 1908, pp. 81-119 and pp. lGl-197. 



„ Orn. Jabrb. 1900, pp. 1-24 and pp. 117-134. 

 Von Tbanuer, Orn. Jabrb. 1910, pp. 81-101. 



An exhaustive list of the literature on the birds of the 

 Canary Islands is given by Dr. Hartert in the ' Novitatcs 

 Zoologica^,^ 1901, pp. 333-335. A great deal has been done, 

 however, since that date. 



In comparing tlie various subspecies with the iiearc.^st 

 allied species from the mainland, it struck me forcibly that 

 these insular forms are almost without exce])tion darker in 

 colouring throughout. 



Some ornithologists will doubtless take exception to the 

 many trinomials included in the following pages. If, however, 

 these insular forms are separable by suflicient characters 



