48 
ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 
3. Myiobius parvirostris. 
Tyrannula parvirostris, Gould , MS. 
M. supra rufobrunneus ; pileo, nucha humerisque obscurb olivaceo-brunneis ; alis brunneis, 
primariarum et secundariarum marginibus exterius august b tectricumque late 
ferrugineis ; caudd guttureque griseo-brunneis; pectore abdumineque jlavescenti 
brunneis. 
Long. tot. 4-L| unc. ; aloe , 2-^ ; caudce, 2^- ; tarsi, ; rost. 
Crown of the head, back of the neck, and shoulders, dark olive brown ; back 
and upper tail coverts rufous brown ; wings brown ; the external edges of 
the primaries and secondaries finely, and the greater and lesser wing coverts 
broadly margined with ferruginous ; tail uniform greyish brown ; throat 
brownish grey ; chest and abdomen sandy brown ; upper mandible dark 
brown ; under mandible yellowish brown ; feet blackish brown. 
Habitat, Tierra del Fuego, Chile, and La Plata. 
This bird inhabits the forests of Tierra del Fuego, and as I procured 
specimens of it in the beginning of winter (June), it probably remains throughout 
the year in the extreme southern part of South America. Other specimens were 
procured on the banks of the Plata, and near Valparaiso in Chile ; it has there- 
fore a wide range. 
4. Myiobius magnirostris. 
Plate YIII. 
Tyrannula magnirostris. Gould, MS. 
M. Fcem. Supra olivaceo-brunnea ; caudd brunned ; rectricum externarum marginibus 
griseo-brunneis ; gutture pectoreque olivaceo griseis; abdomine caudceque tectricibus 
infer ioribus pallidb flavis ; alis saturatb brunneis, secundariis tectricibusque late 
griseo marginatis. 
Long tot. 5^ 5 dice, 2-^- ; caudce, 2^ ; tarsi, ^ ; rost. r ^. 
Crown of the head and back olive brown ; tail brown ; the external margins of 
the two outer feathers greyish brown ; throat and chest olive grey ; abdomen 
and under tail coverts very pale citron yellow ; wings dark brown ; second- 
aries, greater and lesser wing coverts broadly margined with grey ; bill and 
feet black. 
Habitat, Chatham Island, Galapagos Archipelago (October). 
This bird and the Pyrocephalus nanus, inhabit the same island. Not very 
uncommon. 
