264 Lieut. -Col. H. Irby on an apparently 



magCj it is as impossible to state to what species it belongs, 

 with any certainty, as to accept it as representing some here- 

 tofore unknown or undescribecl form. The specimen was pro- 

 cured also by Natterer, at Matagrosso. 



I desire to take this opportunity of thanking Herr von 

 Pelzeln for his kindness in loaning me these types, and en- 

 abling me to make comparisons, and thus to obtain more cor- 

 rect ideas of these specimens than is possible from any de- 

 scription. 



Thalurania lerchi. 



Besides the types above described, I have lately succeeded 

 in adding to my collection the unique type of Thalurania 

 lerchi, Muls. & Verr. Ann. Linn. Soc. Lyons (1868). This 

 was also placed, in the review of this genus (Ibis, 1873, p. 360), 

 among the undetermined species ; and I now find that it is 

 in no way allied to Thalurania, but constitutes a very distinct 

 species of the genus Eucephala, diflfering from all others in 

 having the upper part of the head a beautiful blue, and must 

 be hereafter known as Eucephala lerchi. It is stated to have 

 been obtained in Columbia. 



XXX. — Notice of an apparently undescribed Species of Corvus 

 from Tangier. By Lieut.-Col. Howard Irby. 



Corvus tingitanus, n. sp. 



C. C. affini, Riipp., similis, sed rostro crassiore et setis ric- 

 talibus antrorsum directis nee postice recurvatis, necnon 

 colore alarum extus plus minusve ferrugineo distin- 

 guendus : long, tota 18'5, alse 14'5, caudse 8, tarsi 2*5, 

 rostri a rictu 2*5, 

 Hab. prope urbem Tingem in imperio Mauritanico. 



During a recent visit to Tangier, it appeared to me that 

 the small Raven there, hitherto considered to be the European 

 species, Corvus corax, was quite distinct from that bird, the 

 note or, rather, croak being quite difierent. This difference, 

 difficult to describe, is easily noticed when heard, the note 

 not being so hoarse; further, its gregarious habits, as many 



