5. osTiNOPs. 319 



Above dark olive, more or less stained with chestnut-rufous ; 

 rump fulvous ; front yellow : below dark olive, yellowish on the 

 throat, and stained with chestnut-rufous on the flanks ; crissum 

 fulvous ; tail yellow, outer pair of rectrices, tips of next pair, middle 

 pair, and inner webs of pair next to middle olive ; bill yellow ; feet 

 black : whole length 16 inches, wing 10, tail 8. Female similar but 

 smaller. 



Hah. Colombia. 



This is the only form of the present group of Ostlnops that I have 

 seen from Bogota, except 0. angiistifrons. Five examples are now 

 before me ; thej- are easily recognizable by the uniform yellowish 

 olive of the whole under surface, but in other respects hardly differ 

 from the two preceding forms. 



a. 2 fid. sk. Bogota. Purchased. 



b, c. (f ad. sk. ; d. 2 ad. sk. Bogota. Sclater Coll. 



e. (S ad. sk. Bogota. Salvin-Godman Coll. 



7. Ostinops oleagineus. 



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

 Ootinops oleagineus, Scl. Ibis, 1883, p. 154, pi. vii. 



Above and beneath olive-green, stained with fulvous on the back, 

 rump, and crissum ; wings blackish, edged with olive ; tail yellow, 

 with the two outer pairs of rectrices and the middle pair wholly 

 olive, the pair next to the middle olive on their inner webs, and the 

 remaining pairs tipped with olive ; bill plumbeous, growing white 

 at the tip ; feet black : whole length 17"5 inches, wing 9-3, tail 7"6. 



Hah. Venezuela. 



Under the name oleaylneus I have found it necessary to separate 

 a single specimen that has been in my collection since 1857, and 

 was referred doubtfully to 0. atrovirens in my American Cata- 

 logue. Its generally olive-green colour, which extends specially 

 over the outer margins of the wings, renders it easily distinguish- 

 able from the three preceding forms ; besides which it has a plum- 

 beous bill (passing into white in the apical portion) and no yellow 

 on the front. The yellow front, however, is occasionally wanting 

 in 0. atrovirens. 0. oleagineus has a slight pendent crest on the 

 vertex, like 0. atrocastaneus and others of the group. 



rt. c? ad. sk. Venezuela, (T^'errcait a). Sclater Coll. (Type of 



the species.) 



8. Ostinops angustifrons. 



Cassicus angustifrons, Spix, Ai\ Bras. i. p. 66, pi. 62 ; Bp. Cons2). i. 



p. 427 ; Cass. Pr. Ac. Sc. Phil. 1867, p. 70. 

 Ostinops anffustifrons, Scl. Cat. A. B. p. 128 ; id. Ibis, 1883, p. 155 ; 



Scl. et S'alv. P. Z. S. 1866, p. 182, et 1873, p. 265 ; iid. Kovmicl. 



p. 35; Cab. J.f. 0. 1873, p. 308; Tacz. Orn. Per. ii. p. 410. 



Above deep olive-brown, more greenish on the head, and passing 



