54 
ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 
This bird is very common in the neighbourhood of Maldonado, where it 
frequents the open grassy plains. It sits on the top of a thistle, or on a twig, 
and catches the greater part of its food on the wing. It is generally quiet in its 
movements and silent. Mr. Gould remarks, that he finds “ nearly all the species 
of this peculiar group to differ remarkably in the structure of their wings and 
tail, while in all other respects they closely resemble each other both in form and 
habit ; I have, therefore, hesitated to separate them into so many genera. I have 
assigned the present species to Mr. Swainson’s subgenus Fluvicola, considering 
that differences in the form of one organ alone would not be sufficient grounds 
for the institution of a new genus among such closely allied species ; the present 
bird evidently leads off to Tcenioptera , a genus proposed many years since, by 
the Prince of Musignano for the Pepoazas of Azara. 
“This species is closely allied to, if not identical with the Pepoaza Do- 
minicana of Azara, but as there is a degree of obscurity in his description, which 
causes some doubt on this point, I have considered it better to pay a just 
tribute of respect to that zealous labourer in the field of natural science, by 
assigning his name to this very elegant bird.” 
1. Xolmis coronata. G. R. Gray . 
Tyrannus coronatus, Vieill. Ency. Meth. p. 885. 
Muscicapa vittiger, Licht. Oat. p. 54. 
My specimen was obtained on the wooded banks of the Parana, near Santa 
Fe, in Lat. 31° S. 
Boie’s name of Xolmis is adopted by Mr. G. R. Gray, as it was proposed 
some five years anteriorly to that of the Prince of Musignano’s. 
2. Xolmis nengeta. G. R. Gray. 
Lanius nengeta, Linne , 1. p. 135. 7. 
Tyrannus nengeta, Swains. Journ. Sci. xx. p. 279. 
Fluvicola nengeta, Strains. Nat. Libr. Fly-catchers, p. 102. pi. 8. 
Tyrannus pepoaza, Vieill. Ency. Meth. p. 855. 
Muscicapa polyglotta, Licht. Spix. II. pi. 24. 
Tyrannus polyglottus. Guv. 
Le Pepoaza proprement dit, Azara, No. 201. 
My specimen was procured at Maldonado, north bank of La Plata, where 
it is not common. Its habits in many respects are like those of the Fluvicola 
Azara; it appears to catch its prey on the wing. Iris bright red. 
