508 CORVIDZ. 
each carefully marked, and which show no sign of immaturity, the female has the 
frontal and crest-feathers tipped with white and those of the male with blue. As in the 
other species of Calocitta there certainly seems to be a sexual difference in the markings 
of the head, we are inclined to think that the sexes can be distinguished by their 
markings in this species ; on the other hand is Grayson’s positive statement that they 
are alike, so that further observations are desirable to clear up this point. 
Grayson says that after the month of September the Urracas (C. colliez), in families 
of seven or eight, will almost invariably be found with the small flocks of Double- 
crested Orioles (Cassiculus melanicterus), with whom they continue all the winter till 
the breeding-season arrives. They follow the Orioles through all their peregrinations 
in the woods, in order to share a part of the various beetles, grasshoppers, and other 
insects and their larve, which the more active Orioles are better fitted to uncover 
from their hiding-places in the bark and leaves of trees. They thus pass the time 
hunting amicably together, the Orioles seeming to be satisfied with their society, and 
at the same time the ever vigilant Urracas, being on the alert, give timely warning of 
danger. 
The Urraca Jay builds its nest in May; it is composed of rough thorny sticks, and 
lined with moss or fibres of roots and grass; it is about as large as that of the Magpie, 
and, like that bird, a great deal of caution is observed in locating it in some inaccessible 
thorny tree. 
It is an inhabitant of Western Mexico, generally met with in the thick and virgin 
forests of the tierra caliente, near the Pacific coast. 
2. Calocitta formosa. 
Pica formosa, Sw. Phil. Mag. new ser. i. p. 437°. 
Calocitta formosa, Scl. & Salv. Ibis, 1859, p. 22°; Scl. P. Z. S. 1859, p. 381°; Salv. Ibis, 1870, 
p. 114°; P. Z. 8. 1888, p. 423°; Lawr. Mem. Bost. Soc. N. H. ii. p. 285°; Bull. U.S. 
Nat. Mus. no. 4, p. 24"; Sharpe, Cat. B. Brit. Mus. iii. p. 88°; Nutt. & Ridgw. Pr. U.S. 
Nat. Mus. vi. p. 892°; Perez, Pr. U. S. Nat. Mus. 1886, p. 153°. 
Pica bullocki, Wagl. Syst. Av. fol. 21, p. 6”. 
Cyanurus bullocki, Bp. P. Z. 8. 1837, p. 115” ; Consp. Av. i. p. 380”. 
Calocitta bullocki, Scl. P. Z. S. 1858, p. 358 ™. 
Garrula gubernatriz, Temm. Pl. Col. p. 436 (Jan. 1828) ™. 
Cyanurus gubernatrix, Taylor, Ibis, 1860, p. 113°. 
Czeruleo-grisea ; pileo postico et nucha azureis ; alis extus azureo-limbatis ; loris, capitis lateribus et gutture albis 
undique nigro marginatis ; crista elongata nigra, plumarum longissimarum dimidio basali griseo ; corpore 
subtus albo; cauda supra cyanea subtus nigra, rectricibus utrinque quatuor albo late terminatis; rostro 
et pedibus nigris. Long. tota 24-0, ale 7-4, caude rectr. med. 13-0, rectr. lat. 5:0, rostri a rictu 1°6, 
tarsi 1-7. (Descr. maris ex Oaxaca, Mexico. Mus. Brit.) 
Q mari similis, sed criste plumis elongatis omnino nigris, nucha nigra, pileo postico tantum ceruleo lavato. 
Hab. Muxico™ ™, Temiscaltepec (Bullock 1), Manzanilla Bay, Rio de Ameria (Xantus 6), 
