BIRDS OF NORTH AND MIDDLK AMERICA. 818 



and third ])i-iiiKiri(\s hoiiiji' loiij^cst. itistciid of the s('\<>m11i. >i.\tli. til'tli. 

 and fourth, as in the other three. 



Any further subdivision would, liowes-er, hiirdly lie justiliable, 

 except possibly in the case of 0. inelanocijaui'd, which ditiers in more 

 respects from any of the other species than any two of them do from 

 one another. 



KEY TO THE SPECIES AND SIBSPECIES OK CISSILOIMI A. 



a. A distinct frontal crest of narrow, nearly strai^rlit, feathers; nostrils largely 

 exi>osed. ( Cis>il/oj)Ii((. san-hlasiana. ) 

 />. Back, etc., bright cerulean blue. (States of .Talisco and Colima and Territory 

 of Tepic, south western Mexico. ). .Cissilopha san-blasiana san-blasiana (p. 'M'A) 

 hh. Back, etc., bright cobalt or ultraniarint^ blue. (State <if (iuerrero, south- 

 western Mexico. ) Cissilopha san-blasiana pulchra ({). ?>\-i) 



an. No frontal crest, but feathers of whole pilcuni more or less elongated; nostrils 

 mostly or wholly concealed. 

 J>. lender parts entirely black, except thighs and under tail-coverts; feathers of 

 pileum only slightly elongated, not forming a distinct crest. 

 c. Nostrils partly exposed; back, etc., light cerulean or tunpioise blue; smaller 

 (wing less than 203). 

 (/. Bill black; rectrices without white terminal spots. (Yucatan; eastern 

 Guatemala; British Honduras. ) . .Cissilopha yucatanica, adult male, ( p. oI.t) 

 (hi. Bill yellow; rectrices with white terminal sjiots. 



Cissilopha yucatanica, young ( jt. 'M-'i) 

 cc. Nostrils wholly covered; back, etc., rich smalt blue; larger (wing more than 

 203). (States of Sinaloa and Sonora, northwestern INIexico. ) 



Cissilopha beecheii (\). 316) 

 bl). Under parts dull blue posterior to chest; feathers of pileum distinctly elon- 

 gated, forming a bushy, decumbent crest. (Guatemala, Salvador, Honduras, 

 and northern Nicaragua. ) Cissilopha melanocyanea ( j). 317 ) 



CISSILOPHA SAN-BLASIANA SAN-BLASIANA (Vigors). 

 SAN BLAS JAY. 



Adults {sexes alike). — Entire head, neck, upper portion of back, and 

 under parts, except thighs and under tail-coverts, uniform black; 

 thig-hs and under tail-coverts dull or dusky ultramarine blu(>: upper 

 parts (except of pileum, hindneck, and upper back) uniform In-ight 

 cerulean or sevres blue, more greenish on wings (verditer blue on ter- 

 tials), the tail cobalt or almost ultramarine blue; under surface of 

 remigcs and rectrices slate-black; bill hhick: iris brown;" legs and 

 feet (in dried skin.s) horn color. 



YoK/if/. — Similar to adults, but black of under parts duller (some- 

 times tinged with dull blue), feathers of hinder crown and occiput 

 more or less tinged or tipped with blue, and bill i)artly (sometimes 

 wholly) yellowish or flesh colored. 



Adult wale— Length (skins), •2T4.5-3t»5 (21)4.:)); wing. i;5.')-13l>.o 

 (137); tail, 137.5-145 (142); exposed culmeu, 30-31 (30.5); depth of bill 



oXantus, manuscript. 



