undescribed Species of Corvus from Tangier. 265 



as a hundred sometimes being seen on the wing at once, are 

 quite opposed to those of our Common Raven*. 



Upon shooting one, it was obviously not that species, which, 

 by the way, is, as far as I have been able to observe, the only 



Raven inhabiting the European side of the Straits of Gibraltar, 

 including " the rock " itself. As above, this bird, which I pro- 

 pose to call tingitanus, closely resembles C affinis, except that 

 the bristles which cover the nostrils are placed horizontally in 

 C. tingitanus, and are upright or vertical in C. affinis. Mr. 

 Sharpe kindly compared the five skins of the latter bird which 

 are in the British Museum with those of C. tingitanus ; and 

 we found the same difference in all the specimens of C. affinis 

 from various localities, all obtained by separate collectors. 

 This difference is also shown in Ruppell^s plate of the head of 

 C. affinis (vol. i. pi. 10. fig. 2). 



In colour these birds from Tangier vary much in the 

 amount of the rusty brown, which, in the adult bird, covers 

 the whole of the upper surface of the wings, particularly the 

 secondaries ; sometimes the tail is also tinged with brown. 

 In all of them there is a trace of brown on the wings. 



This Raven is excessively abundant around Tangier and in 

 the low flat country which I have visited in Morocco, but does 

 not appear so much to frequent high mountainous districts. 



* [But see Ibis, 1859, p. 312. The Algerian Raven here referred to 

 may be tbe same as the Tangier bird, — Ed.] 



