LITTLE-KNOWN SPECIES OF ACCIPITRES. 263 
may be employed subgenerically—ought, as M. de Lafresnaye' has observed, to come 
close to the true Urubitinge ; and Buteogallus with its two species (equinoctialis and 
nigricollis) follows next. A bird more closely corresponding to the Urubitinge in its 
changes of colouring is Urubitornis solitaria, of which M. Jules Verreaux has described 
the several stages of plumage in our ‘ Proceedings®;’ but it is distinguishable by its 
shorter and much more robust tarsi. 
2. ButEo zonocercus, sp. nov. (PI. LIX.) 
Schistacescenti-niger unicolor, alis extus brunnescente tinctis: remigum pogoniis interi- 
oribus albo obsolete transfasciatis : cauda nigra ; vitta inferiore lata, et alteris duabus 
supertoribus angustioribus et imperfectis cum margine apicali albis : rostro nigro, cera 
aurantia, pedibus flavis. 
Long. tota 17:0, ale 14:7, caude 7°5, rostri a rictu 1°3, tarsi 2°9. 
Hab. Guatemala. 
In plumage this bird is very much like the typical Urubitinge, being of a nearly 
uniform ashy-black, tinged with brown on the scapularies and secondaries, and with a 
broad white band across the tail. Above this are two other bands, much narrower and 
not quite complete, and the tail is likewise tipped with white. The colour of these 
bands is pure white on the under surface ; on the upper surface it is cinereous on the 
outer webs of the lateral rectrices, and on both webs of the medial pair, but pure white 
on the inner webs of the lateral tail-feathers. The lowest band is about 13 inch in ° 
breadth, the second not haif an inch, and the highest is quite narrow. There are 
distinct traces of white cross-bands on the inner webs of the wing-feathers. The wings 
are, however, much more elongated than in the Urubitinge, the third primary (which is 
longest) extending 4 inches beyond the secondaries. The fourth and fifth primaries are 
only slightly shorter than the third, the first being nearly of the same length as the 
longest secondary. The general form seems to be that of the Buteones appertaining to 
the subgenus called Tachytriorchis ; and the nearest ally of the present species among 
the specimens of the British Museum appears, as has been pointed out to me by 
Mr.G.R. Gray, to be his Buteo albonotatus (Cat. Accipitres [1848], p.36). This latter 
bird does not appear to me to differ from Cabanis’ Buteo abbreviatus, described in 
Schomburgk’s ‘ Reisen in Britisch Guiana,’ vol. iii. p. 739, and I should be inclined to 
consider the two names as synonymous. 
3. SYRNIUM ALBITARSE, sp. nov. (PI. LX.) 
Syrnium albotarse, G. R. Gray in Mus. Brit. 
Supra brunnescenti-nigrum, plumis omnibus pallido rufo semel aut pluries late trans- 
fasciatis ; pileo unicolore mgricante, plumis subtus pallide rufis: alis caudaque nigri- 
cantibus ; remigum pogoniis exterioribus quinque sive sex maculis quadratis pallide 
* Revue Zoologique, 1848, p. 240. * See P. Z. S. 1856, p. 145. 
VOL. 1V.— PART VI. 2p 
