51 
Genus TyRANNULA, Swains. 
The genus Tyrannula, as Prince Ch. Bonaparte has apprehended 
it, is too large, and the forty species must be divided into some natu- 
ral genera and different subgenera. 
The manner of arranging these species in geographical sections is 
very simple, but very often the wrongest way, although so very clear 
that it can be understood by everybody. It is true that some genera 
are limited to a certain part of the world; but there are also many 
genera which are composed of species from all parts of the world, or 
from different zones of the same part of the earth. 
A very natural section is formed by the species which Bonaparte 
called “ Ultimi Tyrannorum sive Tyrannularum prime.” 
The bill of the length of the head; over the nostrils as high as 
broad; the back rounded off; the gape bristle-feathers of moderate 
length ; the wings moderately long, reaching to the tail-cover feathers ; 
the tip of the wing short ; the first wing-feather as long as the eighth, 
third and fourth the longest ; the long tail of the length of the body ; 
the head unicolor, without yellow crest, but the feathers can be erected ; 
above dirty olive, with darker-coloured head ; gorge and over breast 
rahe the belly yellowish ; the margins of the wings and tail ru- 
ous. 
1. Tyr. Coorert. Muscicapa, Nuttall. 
With shorter wings than mezicanus, but with longer bill, like eri- 
nita ; throat and over breast light grey, not so dark as erinita; the 
black stripe along the inner webs of the tail-feathers is broader, like 
stolida. 
Hab. Northern America and Chili. Brit. Mus. 
2. Tyr. crinita. Muscicapa, Linn. ; irritabilis, Vieill. 
With longer wings; throat and over breast darker grey; all the 
wing-feathers, except the first, black-brown with rufous margins. 
Hab. North America. In every museum. 
3. Tyr. Gossi1, Bonap. 
With longer wings ; the anterior part of the outer webs of the first 
and second hand-wing whole rufous ; the head darker, and the ash- 
grey dark, like crinita. 
Hab. Jamaica. Brit. Mus. 
4. Tyr. Mexicana, Kaup. 
With short wings; all the wing-feathers, except the first, with ru- 
fous margins ; breast light ash-grey ; above lighter. 
Mr. Wollweber sent me this species, which I found also in the 
British Museum. 
5. Tyr. srottpa. Myobius, Gosse. 
With short wings; the rufous margins on the wing-feathers very 
fine ; the black stripe along the shafts of the inner webs of the tail- 
