90 ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 



Sub-Fam.— FRINGILLIN^E. 



1. Ammodramus longicaudatus. Gould. 



Plate XXIX. 



A. vertice humeroque cinereofuscis, dor so pallescenti fusco, uropygio rufescenti fusco 

 tincto, plumis singulis strigd media fused ; tectricibus alarum majoribus, remigibus 

 primariis secundariisque el caudd nigrescentibus, cinereo albo exteme marginatis ; 

 fronte, strigd superciliari corporeque infra Jlavescentibus . 



Long. tot. 5f unc. ; alee, 2f ; caudce, S ; tarsi, § ; rostri, ■ r Q w . 



Crown of the head and shoulder, greyish brown ; back, light brown, tinged with 

 reddish brown on the rump, and with a stripe of dark brown down the centre 

 of each feather; greater wing-coverts, primaries, secondaries, and tail blackish, 

 margined externally with greyish white; forehead, stripe over the eye, and 

 all the under surface, buff; bill black ; feet brown. Young, or a bird after 

 gaining its new plumage, differs in having the whole of the upper surface rich 

 brown, with a tinge of olive and with a stripe of dark brown down each feather, 

 and in having the wing coverts margined with reddish instead of greyish brown. 



Habitat, Monte Video (November), Maldonado (June). 



At Maldonado this bird frequented, in small flock's, reeds and other aquatic 

 plants bordering lakes. In general habits, as well as in place of resort, it resem- 

 bles those species of Synallaxis and Limnornis, with which it is often associated. 

 It appears to live entirely on insects, and I found in the stomach of one which I 

 opened various minute Coleoptera. Mr. Gould remarks, that the structure of this 

 Ammodramus is very remarkable, for that it has a great general resemblance both 

 in form and colouring to Synallaxis, although the thickness of its bill shows its 

 relation to the Fringillinae. In its habits it certainly is more allied to the former 

 genus, than to its own family. 



2. Ammodramus Manimbe, G. R. Gray. 



Plate XXX. 



Ammodramus xanthornus, in Plate, and in Gould's MS. 

 Fringilla Manimbe, Licht., Cat. No. 253. 

 Emberiza Manimbe, D'Orb. fy Lafr., Syn. p. 77. 

 Manimbe, Azara, No. 141. 



My specimen was obtained from Maldonado. 



