50 
ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 
This bird, like the last species, generally moves in very small flocks. Its 
habits, I presume, are also very similar ; for I state in my notes that it closely 
approaches to our tit-mice in general manners and appearance. 
3. Serpophaga nigricans. Gould. 
Sylvia nigricans, Vieill. 
Tachuris nigricans, D’Orbig. fy Lafr. Mag. de Zool. 1837. p. 55. 
Le Petit Tachuris noiratre, Azam, No. 167. 
This bird is common in the neighbourhood of Maldonado, on the banks of the 
Plata. It generally frequents the borders of lakes, ditches, and other moist 
places; but is related in its general manners with the last species. It often 
alights on aquatic plants, growing in the water. When seated on a twig it occa- 
sionally expands its tail like a fan. 
Sub.-Fam. — TITYRAN iE. (Psarianae, Sw.) 
Pachyramphus, G. R. Gray. 
Pachyrhynchus, Spix. 
1. Pachyramphus albescens. 
Pachyrhynchus albescens, Gould , MS. 
Plate XIV. 
P. olivaceo-griseus ; alis nigrescenti brunneis, albescenti marginatis ; gutture corpore- 
que subtus griseo-albis ; alarum tectricibus inferioribus pallide sulphureis. 
Long. tot. 5 t 3 2 unc. j 2 t 7 2 > c uudce, 2^ ; tarsi , 5 rost - 
Head and all the upper surface olive grey ; wings blackish brown, the coverts 
and secondaries broadly margined with dull white ; primaries narrowly 
margined with greyish white ; tail blackish brown, the external web of the 
outer feather white; under surface of the shoulder pale sulphur yellow; 
throat and under surface greyish white ; bill and feet black. 
Habitat, Buenos Ayres. 
The generic name of Pachyrhynchus Spix, is changed by Mr. G. R. Gray, 
to Pachyramphus, as the former word is used in entomology. 
