496 CORVIDA. 
the nearly total absence of any mention of it in other parts of the country, that it is 
restricted to very narrow limits, probably not extending beyond the slopes of the great 
volcanos. 
b. Plume nasales a plumis frontis haud distincte, he plus minusve projecte aut erecte. 
CYANOLYCA. 
Cyanolyca, Cabanis, Mus. Hein. i. p. 223 (1850). 
Xanthura, Sharpe, Cat. B. Brit. Mus. iii. p. 128 (partim). 
In Mr. Sharpe’s arrangement of the eight species we include under this generic 
name, four are placed in Xanthura and the rest in Cyanocorax; but we cannot help 
feeling that comparative measurements of tail, wings, &c., upon which Mr. Sharpe 
relies, have led him to associate birds by no means nearly allied, judging by their 
colours, and it seems to us that his section 2 of the genus Xanthura had best be 
separated and associated with his section ¢ of his genus Cyanocorax. This treatment 
brings together a group of birds which are not structurally dissimilar, and which more 
or less share the same colours in different combinations, and we have no such discordant 
element as X. /wawosa, in which the colours depart entirely from the rest. 
The eight species we now include under this name fall naturally into several groups. 
C. sanblasiana, the type of the genus Cissolopha of Bonaparte, can readily be distin- 
guished by its peculiar elongated frontal crest. C. beecheyi and C. yucatanica have 
yellow legs, and the colour of the bill differs in the sexes, moreover the female of 
C. yucatanica has white tips to the outer tail-feathers. The other species have no 
abnormal characters; but C. ornata has the frontal feathers more distinctly erect than 
in C. melanocyanea. 
The type of the genus Cyanolyca of Cabanis is C. armillata from Colombia, a species 
not represented in our region by any near ally. 
a. Crista frontalis tenuis, valde elongata, nigra ; venter omnino niger. 
1. Cyanolyca sanblasiana. 
Geai de San Blas, Néboux, Rev. Zool. 1840, pp. 290, 323?. 
Pica sanblasiana, Lafr. Mag. Zool. 1842, Ois. t. 28°. 
Cissolopha sanblasiana, Bp. Consp. Av. i. p. 380°; Lawr. Mem. Bost. Soc. N. H. ii. p. 284°. 
Cyanocitta sanblasiana, Scl. & Salv. P. Z. S. 1876, p. 269°. 
Xanthura sanblasiana, Sharpe, Cat. B. Brit. Mus. iii. p. 182°. 
Cyanocorax de San Blas, Prév. et Desmurs, Voy. ‘ Venus,’ v. p. 200". 
Supra azurea, uropygio et cauda saturatioribus; alis magis viridescentibus ; capite toto cum collo et corpore 
subtus nigerrimis ; tibiis et crisso indigoticis ; crista frontali elongata, nigra; rostro nigro, pedibus corylinis. 
Long. tota 12:0, alee 5-2, caudex 5°7, rostri a rictu 1-4, tarsi 1:5. (Descr. femine ex Colima, Mexico. 
Mus. nostr.) 
Hab. Mexico ?, San Blas, Acapulco (Wéboue } 2), plains of Colima, Manzanilla Bay, Los 
Trochos (Xantus *). 
