BIRDS OF NORTH AND MIDDLE AMEEICA. 3U8 



PSILORHINUS MEXICANUS VOCIFERUS (Cabot). 

 YUCATAN BROWN JAY, 



Similar to 1\ m. cyanogenys^ but smaller, especially the t»ill; the 

 white at tips of reetrices more cxtondod. and the under parts of the 

 body whiter (posterior half, including thiohs, pure white). 



Adults.— Length (skins), 374.5-401.5 (385.5); wing, 181-189 (187); 

 tail, 183-196 (190); bill from nostril, 23.5-25 (24); depth of bill at 

 nostrils, 14.5-15 (15); tarsus, 43.5-50 (46); middle toe, 27.5-30 (29); 

 length of white spot on inner web of outermost tail-feather, 38-51 

 (44. 5). « 



Yucatan. 



Corvus vociferuii Cabot, Proc. Bost. Soc. N. II., i, 1843, 155 (Yucatan; coll. S. 



Cabot, jr.); Journ. Bost. Soc. N. H.. iv, 1844, 464 (do.). 

 /'[.s(7or7mm,s] roriferv.s 8tone, Proc. Ac. Nat. Sci., 1891, 95, in text. 

 Psilorliinns mcrirnuuH (not of Riippell) Chapman, Bull. Am. Mus. N. If., vili, 



1896, 282 (Chichen-Itza, Yucatan). 



Genus CYANOCORAX Boie. 



Cyanocorax Boie, Isis, 1826, 975. (Type, ('ornis pUeatus Temminck, =Pica 



chrysops Vieillot. ) 

 Coronideus^ Cabaxis, Mus. Hein., i, Oct., 1851, 225. (Type, Cyanocorax hya- 



einthvms Cabanis, = C. riolacetis Du Bus. ) 



Large-sized Garrulinic with frontal, loral, and posterior na.sal pliunes 

 erect and stiff, the nostrils hidden hy well-developed antrorse tufts, 

 and the crown more or less crested. 



Nodljication. — (Unknown ?) 



Range.- — Costa Rica (Atlantic side) to Peru, Bolivia, Argentina, Para- 

 guay, and southern Brazil. (Eight species, only one of them occur- 

 ring north of the Isthmus of l*anama.) 



There is nuich difference in certain respects involving external 

 structure among the species which are here referred to Ci/anocora.r'xn 

 a more restricted sense than that usually emploved, and a further 

 subdivision may be desirable. 



The type. Pica chryxops Vieillot, differs conspicuously from all the 

 rest in the structure of the crest, which is well developed on the crown 

 and oc(;iput (especially the latter), and is coiuposed of very stiff feathers, 

 the tips of which turn upward, producing the appearance of coarse 

 velvet. The style of coloration, however, even to the head markings, 

 is <piite the same as in ('. cayaims^ ('. ujfi/i/s^ ('. xclafti'i, and C. cya- 

 nopogo)!., in which the crest is very different, the feathers being 

 decumbent at their tips instead of thc^ reverse. C mystacalis is a 

 little aberrant in its more slendci- liill :iml wholly white tive outer 



"Three specimens. 



