115 



nigro, corona cyaned ; rccfricibtis duubus mccliis ultra rachim 

 nudam ccerideis, apice niyricante. 

 Momotus, Briss. Ramphastos momota, L. Momotus Brasiliensis, 

 Lath. 



4. CuoTOPHAGA SuLciROSTRA, Sw. Or. Cascisu, Less. 

 Long. 11" 6'". 



5. CoRvus Cacalotl. Wagl. Isis, 1831, p. 527. Cacalotl. 

 Hernandez Thes. p. 48, c. 174. 



This hird is verj^ properly regarded and characterized by Wagler 

 as distinct from the European Corvus Corax, although its differen- 

 tial characters have escaped the notice of all writers on North Ame- 

 riciin ornithology. It therefore diminishes still further the daily 

 decreasing list of birds which have been regarded as common to the 

 two great continents. 



Besides the different form of the bill, contour of the feathers, and 

 shape of the tail, the proportions in the lengths of the primaries differ, 

 as is usual in the different species of crows. The first quill is shorter 

 than the seventh, the second and sixth are equal ; the third is shorter 

 than the fifth, the fourth being the longest ; while in the European 

 bird the second quill is longer than the fourth, and the third is the 

 longest of all. In the American species, the second is much shorter 

 than the fourth, which is even longer than the third and fifth. 



This species must not be confounded with the more brilliant and 

 more strongly marked C. splendens of Gould, also from Mexico. 



6. Cyanurus Bullocki, Nob. Pica Bullockii, Wagl. 



The numerous synonyms and descriptions of this magnificent and 

 well-known species need not be recited here. 



7. Cyanocorax coronatus, Nob. Garrulus coronatm, Sw. 

 Not to be confounded with the closely-allied species, G. Stelleri. 

 "We propose retaining Cyanurus, Sw., for the long-tailed Blue 



Magpies, whilst Cyanocorax, Boje, belongs by right to the American 

 Blue Jays. 



8. Cassicus. a small white-billed species, of an uniform in- 

 tensely black colour, with a remarkably robust tail. This can be 

 referred to the C. nigerrimus of Spix, or, perhaps with still more 

 propriety to the C. solitarius of Azara. In consequence of the con- 

 fusion which still reigns among these black American birds, I am 

 unwilling to increase it by giving the present bird a specific name, 

 but must content myself with subjoining a description. 



C. in toto nifferritnus; rostro valido acuminato ex virescente albo • 

 pliimis capitis elongcdis, latis, rotundatis ; remigibus rectrici- 

 busque latissimis, subfasciatis ; caudd gradatd, 



9. CoccYzus Cayanus. C. rufus, pectore abdomine femoribus- 

 que plmnbeis ; caudd longissimd vcdde cimeald, rcctricibus late- 

 ralibus apice albis. 



Cuculus Cayanus, L. 



