115 



nigro, corond cyaned ; rectricibus duabus mediis ultra racftim 

 nudam cceritleis, apice niyricante. 

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

 Lath. 



4. Crotophaga Sulci rostra, Sw. Cr. Casasii, Less. 

 Long. 11" 6"'. 



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

 Hernandez Thes. p. 48, c. 174. 



This bird is very properly regarded and characteįized by Wagler 

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

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

 rican 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 primanęs difFer, 

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

 than the seventh, the second and sixth aie 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 mušt not be confounded with the more brilliant and 

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



6. Cyanurus Bullocki, Nob. Pica Bullockii, Wagh 



The numerous synonyms and descriptions of this magmficent and 

 •well-known species need not be recited here. 



7. Cyanocorax coronatus, Nob. Garrulus coronatus, 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, Boję, 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 -vvhich still reigns among these black American birds, I am 

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

 but mušt content myself -vvith subjoining a description. 



C. in toto nigerrimus; rostro valido acuminato ex virescente albo ; 

 plumis capitis elongatis, latis, rotundatis ; remigibus rectrici- 

 busque latissimis, subfasciatis ; caudd gradatd. 



9. CoccYZUS Cayanus. c. rufus, pectore abdomine femoribus- 

 que plumbeis ; caudd longissinid valde cuneatd, rectricibus late- 

 ralibus apice albis. 



Cuculvs Cayanus, L. 



