78 ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 



acute, but not loud, rapidly reiterated cry. They are active and busily seek for 

 small insects, chiefly Coleoptera, in the coarse herbage. The iris in all is rusty 

 red; the tongue is divided and terminates in bristly points. These reed birds, 

 which are very numerous both in species and individuals, on the borders of lakes 

 in the provinces north of the Plata, appear to supply in South America, the 

 various Sylvise, which frequent similar stations in Europe. 



5. SVNALLAXIS FLAVOGULARIS. GouM. 

 Plate XXIV. 



S. supra fuscescenti cinereus, infra cinereo-fuscus ; remigihus ohscurhfuscis, hasiohscurh 

 rnfis ; caudcB plumis sex mediis nigro-fuscis, externis ferrugineis ; genis guldque 

 Jlavescentibus, plumis singtdis apice obscurhjuscis. 



Long. tot. 6| unc ; rost. | ; alw, 2| ; caudw, 3g ; tarsi, f ; 



Head and all the upper surface, brown ; primaries, dark brown, with the basal 

 portions rufous ; six central tail-feathers, blackish brown ; the remainder fer- 

 ruginous ; sides of the face and throat yellowish, with the tip of each feather 

 dark brown ; the remainder of the under surface, greyish brown ; bill and 

 feet, dark brown. 

 Habitat, Patagonia. 



My specimens were obtained at Bahia Blanca and at Santa Cruz, two extreme 



parts of Patagonia. It frequents the thinly scattered thickets on the arid plains : 



the hind claw of its foot is not produced as in S. rnfogularis, and it lives less on 



the ground. 



6. Synallaxis brunnea. Gould. 



S. pallide ruhrofuscu ; primariis secundariisque rujis apice fuscis ; caudte plumis qua- 

 tuor mediis nigrescenti fuscis, duabus proximis ferrugineo fuscis iuternh nigres- 

 centi-marginalis, duabus extimis ferrugiueo fuscis ; geuis, guld abdomineque medio 

 albesceutibus ; hi/poc/ioudriis ciuereis. 



Long. tot. 5j*T ; unc. rost. -^ ; ala; 2-^^ ; caudw, | ; tarsi, \%. 



Head and all the upper surface pale reddish brown ; primaries and secondaries, 

 brown at the tip and rufous at the base ; four central tail feathers, blackish 

 brown ; the next on each side rusty brown, margined internally with black- 

 ish brown ; the two lateral feathers wholly rusty brown ; sides of the face, 

 throat, and centre of the abdomen, whitish ; flanks cinereous ; bill and feet 

 brown. 

 Habitat, Port Desire, Patagonia. {January.) 



