/<73 
Mr. 0. Salvin on the Humming-birds of Guatemala. 259 
southwards from Hudson's Bay alone to the warmer latitudes. 
I cannot form an opinion of the comparative numbers to the 
westward, that is to say, of the Geese that leave the Arctic coast 
and wend their way straight to their winter quarters without 
touching the Bay at all; but supposing it to equal the flight of 
the body already mentioned, we shall then have 720,000, or 
perhaps say 800,000 Geese leaving the coasts east of the Rocky 
Mountains for their places of hybernation:—the Brant Geese 
are not included. This may be supposed much underneath the 
true estimate, yet I would not wish to give a greater ; for although 
the swarms of Geese passing appear at times prodigious, vet, like 
many other scattered objects, when they come to be collected and 
counted, they become subject to a moderate figure. Say that 
Geese fly about a yard apart: this would make a winged string of 
life 450 miles in length ; and suppose the rate of flight was 
40 miles per hour, and the line led by one going straight south, 
they would take eleven hours in passing any given object. 
Michipicoton, Dec. 6th, 1859. 
XXXII .—Notes on the Humming-birds of Guatemala. 
By Osbert Saevin, M.A., F.Z.S. 
The following notes relate to species of Humming-birds observed 
in Guatemala, at Duenas, Coban, and Salama, during the months 
of August, September, October and November 1859. 
The references to each species will be found in the previous 
papers on the Ornithology of Central America published in this 
Journal. 
As I have collected many examples of the several species of 
Humming-birds, I take the opportunity of illustrating, by actual 
figures, the ratio in numbers the males bear to the females, and 
give under each separate species that ratio, as shown by the 
specimens before me. 
It may be from not having hit upon the localities for the 
opposite sex, that I have found one, be it male or female, usually 
largely predominating; yet it seems somewhat strange that the 
localities in which I have worked should have been, with few 
exceptions, those in which the males most abound. I will not 
i860. 
