490 COEVID^. 



Cauda cyanea nigro obsolete transvittata ; subtus cserulea ; tibiis et subalaribus nigrioantibus ; rostro et 

 pedibus nigris. Long, tota 10-0, alse 5"7, caudse 5-0, rostri a riotu 1-4, tarsi 1-6. (Descr. maris ex 

 Ciudad, Durango, Mexico. Mus. nostr.) 

 2 mari similis. 



Hab. North America, Central Eocky Mountains from Canada southwards. — Mexico, 

 Ciudad in Durango (Forrer). 



According to American authors this is a form of Cyanocitta stelleri, ranging through 

 the central Eocky Mountains to New Mexico and Southern Arizona, and, as we now 

 see, to the Sierra Madre in the State of Durango. From C. stelleri itself it may 

 readily be distinguished by the white spots above and below the eye, and it is the only 

 one of the northern forms that possesses this feature, though it is shared by both the 

 species which follow. C. macrolopha is a resident species wherever it is found, living 

 chiefly in the pine-woods, up to an elevation of about 10,000 feet. Mr. Eidgway 

 found its nest in the Wahsatch Mountains in a small fir-tree on the edge of a wood ; 

 it was constructed of coarse strong sticks, rudely put together, and upon these a thick 

 plastering of mud of uniform concave shape is added, the lining being of fine wiry roots. 

 The eggs are of a light sea-green ground-colour, somewhat sparingly and finely spotted 

 with olive-brown and lighter markings of violet or purple-brown. 



2. Cyanocitta diademata. 



Cyanogarrulus diadematus, Bp. Consp. Av. i. p. 377 '. 

 Cyanocitta diademata, Scl. P. Z. S. 1860, p. 252'; 1864, p. 175'. 

 Cyanocitta stelleri diademata, Perez, Pr. U. S. Nat. Mus. 1886, p. 152 *. 



Prsecedenti similis, dorso medio cyaneo tinoto, dorso imo et supracaudalibus intense cyaneis, forsan distin- 

 guenda. 



Hah. Mexico, Zacatecas i, valley of Mexico ( White ^), Hacienda de San Pedro, State 

 of Puebla {Perez^), Orizaba (SallS^). 



Mr. Sharpe, in the third volume of his Catalogue of Birds, in treating of these Jays 

 seems not to have appreciated the diff'erences between G. diademata and C. coronata, for 

 his description of the former is clearly based upon a specimen of the latter, as his 

 reference to the colour of the crest shows, and from the notes appended to his account 

 of the two birds it appears that he was of opinion that the blackness of the crest is pro- 

 bably a characteristic of the- female or young bird. Under these circumstances we are 

 unable to refer Mr. Sharpe's names to their proper place with any certainty. We use 

 the names precisely in the sense of Bonaparte, and we think there can be no doubt 

 whatever that the name C. diademata refers to the black-crested bird, and C. coronata 

 of both Bonaparte and Swainson to that with the blue crest. That the colour of the 

 crest is due to sex or age we do not believe, for with a familiar acquaintance with 

 C. coronata in Guatemala we never met with a black-crested bird, and we have a young 

 specimen before us in its first plumage in which the crest is distinctly blue. We have 



