BIRDS OF NOKTH AND MIDDLE AMEEICA. 3U3 



PSILORHINUS MEXICANUS VOCIFERUS (Cabot). 

 YUCATAN BROWN JAY. 



Similar to P. m. cymwgmys, but smaller, especially the bill; the 

 white at tips of rectrices more extended, and the under parts of the 

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



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

 tail, 188-196 (190); bill from nostril, 23.5-25 (24); depth of bill at 

 nostrils, 14.5-16 (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 vodferm Cabot, Proc. Bost. 8oc. N. H., i, 1843, 155 (Yucatan; coll. S. 



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

 Plsilorhinus'] vorAferus Stone, Proc. Ac. Nat. Sci., 1891, 95, in text. 

 Pdlorhinus mexicanus (not of Eiippell) Chapman, Bull. Am. Mus. N. H., viii, 



1896, 282 (Chichen-Itza, Yucatan). 



Genus CYANOCORAX Boie. 



Cyanocorax Boie, Isis, 1826, 975. (Type, Comas pileatus Temminck, =Pica 



chrysups Vieillot. ) 

 Coronideiisb Gabanis, Mus. Hein., i, Oct., 1851, 225. (Type, (Jyanocorax hya- 



cinthinus Oabanis, = f'. molaceus Du Bus. ) 



Large-sized Garrulinee with frontal, loral, and posterior nasal plumes 

 erect and stiif, the nostrils hidden by well-developed antrorse tufts, 

 and the crown more or less crested. 



Nodification. — (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 Panama.) 



There is much difference in certain respects involving external 

 structure among the species which are here referred to Cyanocm'ax in 

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

 subdivision may be desirable. 



The type. Pica chrysops Vieillot, differs conspicuousl}^ from all the 

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

 and occiput (especiall}^ the latter), and is composed of verj' stiff' feathers, 

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

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

 is quite the same as in C cayanm^ C. uffinin., C. sdati^ri, and O. cya- 

 nopogon, in which the crest is very different, the feathers being 

 decumbent at their tips instead of the reverse. O. mystacalis is a 

 little aberrant in its more slender bill and wholly white five outer 



"Three specimens. 



^"Yqw xopfioviSEVi, EOJS, 6 noiu. prop." 



