490 CORVIDZA. 
cauda cyanea nigro obsolete transvittata ; subtus cerulea; tibiis et subalaribus nigricantibus ; rostro et 
pedibus nigris. Long. tota 10-0, ale 5°7, caude 5:0, rostri a rictu 1:4, tarsi 1°6. (Descr. maris ex 
Ciudad, Durango, Mexico. Mus. nostr.) 
© mari similis. 
Hab. Norta America, Central Rocky Mountains from Canada southwards.—MExico, 
Ciudad in Durango (Forrer). 
According to American authors this is a form of Cyanocitta stelleri, ranging through 
the central Rocky 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. Ridgway 
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. 1. p. 377°. 
Cyanocitta diademata, Scl. P. Z. 8. 1860, p. 252°; 1864, p. 175°. 
Cyanocitta stelleri diademata, Perez, Pr. U. S. Nat. Mus. 1886, p. 152%. 
Preecedenti similis, dorso medio cyaneo tincto, dorso imo et supracaudalibus intense cyaneis, forsan distin- 
guenda. 
Hab. Mexico, Zacatecas 1, valley of Mexico (White ?), Hacienda de San Pedro, State 
of Puebla (Perez +), Orizaba (Sallé ). 
Mr. Sharpe, in the third volume of his Catalogue of Birds, in treating of these Jays 
seems not to have appreciated the differences between C. 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 
