STALIA. 47 
appears it is very common throughout the entire temperate region, ascending to a 
height of 7400 feet above the sea. In Guatemala it is distributed over the table- 
lands of the Cordillera, ascending as high as 10,500 feet. It breeds in the neigh- 
bourhood of Duefias, as we more than once obtained young birds in their first spotted 
plumage in August. The lowest district where it is found is on the plains of San 
Ger6nimo, where it also breeds, Mr. Owen having obtained its eggs in 1860. It is 
also abundant in open places in Alta Vera Paz, having been noticed both at Tactic 
and Coban. In Honduras, the most southern locality whence we have any tidings of 
Sialia sielis, Mr. Taylor found it throughout the line of country he traversed, being 
common amongst the pine trees of the high ridges 1%, 
In its migrations this bird would seem to be somewhat irregular, as it sometimes 
makes its appearance in the United States in February, and even in the end of January 
when the season is mild?. It is resident in Bermuda, but in Cuba of uncertain 
appearance. A large flock, Dr. Gundlach tells us, arrived in April 1860 in the neigh- 
bourhood of Havana; but since then he has not observed it 7. 
2. Sialia mexicana. 
Sialia mexicana, Sw. Faun. Bor.-Am. ii. p. 2021; Scl. P. Z.S. 1856, p. 293°, 1859, p. 362°; Baird, 
Rev. Am. B. i. p. 63*; Sumichrast, Mem. Bost. Soc. N. H.i. p. 544°; Baird, Brew. & 
Ridgw. N. Am. B.i. p. 65°; Lawr. Mem. Bost. Soc. N. H. ii. p. 2677; Coues, B. of the 
N.W. p. 14°. . 
Stalia ceruleicollis, Vig. Zool. Voy. Blossom, p. 18, t. 3°. 
S. siala similis, sed supra purpurascentius azurea, gula et abdomine medio cerulescentibus differt. Long. 
tota 6°5, ale 4:5, caude 2°8, rostri a rictu °75, tarsi 75. (Descr. exempl. ex Jalapa, Mexico. Mus. 
nostr.) 
Hab. Wrstrern Nortu America, from Rocky Mountains to Pacific ®§.—Mexico !2 (Sallé ; 
le Strange), Saltillo (Couch *), Mazatlan (Grayson"), plains of Colima (Xantus‘), 
Jalapa (de Oca*), Popocatepetl (Suwmichrast®). 
In North-western Mexico Sialia mexicana would appear to be found at lower eleva- 
tions than in Southern Mexico; and this may also be said of it in the districts it 
frequents in more northern countries, Dr. Cooper recording its abundance in all wooded 
districts in California, except in the high mountains®. This species would appear 
to be more stationary in its habits than the eastern species S. sialis, as Dr. Cooper met 
with birds associated in flocks in Washington Territory in December, at a time when 
S. sialis is to be found in much more southern countries®. In its habits §. mevicana 
resembles S. sta/is; but its song is described as far less tuneful °, 
In Guatemala we never observed this species ; for though Bluebirds were obtained in 
mountains over 10,000 feet above the sea, they proved to be of the eastern species. 
~The Mexican Bluebird was described by Swainson, in a note in the ‘ Fauna Boreali- 
