154 Mr. P. L. Sclater on the 



-V Ostinops atrocastaneus, Cab. Journ. f. O. 1873^ p. 309. 

 Supra sicut in O. salmoni ; subtus ex castaneo brumieus, 

 fere unicolor, crisso fulvo; caudae pictura fere ut in 

 sp. prsec.^ seel colore nigro interdum latins extenso : long, 

 tota (maris) 16, alse 8-5, caudse 8; (fern.) 14, alse 7'3, 

 caudffi 6'5. 

 Hab. Ecuador and Upper Amazonia ; San Jose, Ecuador 

 {Buckley) ; Pallatanga and Nanegal {Fraser) . 



The merit of first distinguishing this species from its allies 

 clearly belongs to Dr. Cabanis ; and I adopt his name for it. 

 But I suspect that Cassicus alfredi of DesMurs is a prior 

 synonym, though it would be necessary to examine the type 

 before stating tliis positively. 



The colouring of the tail, although generally as above de- 

 scribed, varies in some specimens. In one of Buckley^s skins 

 from Ecuador the black extends partially over the inner webs 

 of the second median pair and over the outer webs of the third 

 and fourth external pair. 



10. Ostinops sincipitalis. 



Ostinops sincipitalis, Cab. Journ. f. 0. 1873, p. 309. 



Cassicus alfredi, Cass. Pr. Ac. Phil. 1867, p. 692 (nee 

 DesMurs) . 



Supra praecedentibus duabus fere similis; subtiis flavicanti- 

 olivaceus, gutture dilutiore, lateribus et crisso in casta- 

 neum vergentibus ; quoad caudse picturam cum O. sal- 

 /wo/<«^. congruens : long, tota (maris) 16, alai 10, caudse 8. 



Hab. Colombia interior. 



This is the only form of the atrocastaneus group of Os- 

 tinops that I have seen from Bogota. Four examples are 

 now before me, three from my own and one of Messrs. Salvin 

 and Godman's collection. They are easily recognizable by 

 the uniform yellowish olive of the whole under-surface, but 

 in other respects hardly differ from the two preceding forms. 



-4--11. Ostinops oleagineus, sp. nov. (Plate VII.) 



Ostinops atrovirens, pt., Scl. Cat. A. B. p. 128 (ex. a). 



Supra olivaceus (fronte flava nulla), interscapulio brunneo 



tincto, dorso pt stico in fulvum transeunte ; alls inti^is 



7 1 nigris, extus olivaceis : subtus olivaceus, in gutture di- 



/ lutior : lateribus et crisso in fulvum transeuntibus ; 



