LITTLE-KNOWN SPECIES OF ACCIPITRES. 263 



may be employed subgenerically-ought, as M. de Lafresnaye' has observed, to come 

 close to the true Urubiting^ -, and Buteogallus with its two species {cequinoctialis and 

 mgncolhsUoUo^s next. A bird more closely corresponding to the Urubitingce 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-nigerunicolor, alls extus brumescente tinctis : remigum pogoniis interi- 

 onbus albo obsolete transfasciatis : cauda nigra ; vitta inferiore lata, et alteris duabus 

 supenonbus angustioribus et imperfectis cum margine apicali albis : rostro niqro cera 

 aurantia, pedibus jiavis. ' 



Long, tota 17-0. alae 14-7, cauda; 7-5, rostri a rictu 1-3, tarsi 2-9. 

 Hab. Guatemala. 



In plumage this bird is very much like the typical Urubiting^, being of a nearlv 

 uniform ashy-black, tinged with brown on the scapularies and secondaries, and with I 

 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 If inch in 

 breadth, the second not half 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 Urubiting^, 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 amon<^ 



t' T"'T" "^ '^'" ^'^"'^ ^"''""^ "PP^^'-^' ^^ •^^^ 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 

 fechomburgks ' 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- 

 fasaatts; pileo unicolore nigricante, plumis subtus pallida 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. IV. PART VI. o 



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