(242 ) 



that the rump, upper tail-coverts, thigh, and flanks are rather more rnfescent 

 brown. The back, too, appears to be slightly more brownish green, while the edges 

 to the wing-coverts and remiges are deeper rufescent brown. These insignificant 

 variations are, no doubt, due to age, for the type of 0. keaysi is immature. The 

 middle of the breast and abdomen is decidedly yellowish, as in No. 2 (S. Jacinto), 

 whereas in the type of C. simplex the belly is nearly uniform dingy olive-green. 

 I agree with Count Berlepsch that this species, notwithstanding its rather divergent 

 bill, finds its natural place in the genus Caenotriccus. To Ockthoeca it has, as far 

 as I can see, no close relation. 



C. simplex is only known as aii inhabitant of the mountains of Northern Bolivia 

 and South-Eastern Peru (Marcapata). 



58. Ochthoeca olivacea Allen = Tyranniscus improbus Scl. & Salv. 



Tymnniscus improbus Sclater and Salvin, P. S. Z. Loud. 1870. p. 841. pi. 53. fig. 3 (1871. Me'rida, 



Venezuela (type) ; Ocana, North Colombia). 

 Ochthoeca olivacea Allen, Bull. Amer. Mus. N. H. xiii. p. 152 (1900. Valparaiso, Santa Marta, 



North Colombia). 



No. 1. Amer. Mus. Nat. Hist., No. 72728. Type of Ockthoeca olivaceus (sic) 

 Allen. Orig. label : " Santa Marta Expedition, 1898-99. Valparaiso, Colombia, 

 April 14, 1899, G. H. Hull." Adult : Wing 64* ; tail 56* ; bill 10 mm. 



This bird is, no doubt, the same as T. improbus, of which the Tring Museum 

 has a large series from the type locality. In fact, on comparing the Santa Marta 

 specimen with fourteen skins from Me'rida, I cannot detect the slightest difference 

 either in colour or size : the back is of exactly the same shade of green ; the 

 darker crown forms a kind of dusky cap ; a distinct frontal band and a spot above 

 the brownish black anteocular patch are white, the auriculars dark olive-brown ; the 

 whitish superciliary line is inconspicuous, as in an adult male from Valle (January 17, 

 1888) ; the throat dull white ; the foreneck flammulated with pale yellowish on a 

 light greyish ground, etc. The pale markings on the wing show the same distribu- 

 tion as in Me'rida examples, but the edges to the median wing-coverts are perhaps 

 more whitish than in the majority of the latter. 



Five adult males from Merida measure : wing 61-63 ; tail 52-55 ; bill 10-1 1 mm. 



T. improbus inhabits the mountains of Western Venezuela (Me'rida) and 

 Northern Colombia (Santa Marta, Ocana). In the north coast ranges of Venezuela 

 it is replaced by T. petersi Berl. About the characters of this species cfr. Hellmayr 

 and Seilern, Arch.f.Naturg. 78, Abt. A, Heft 5, September 1912, p. 79. 



59. Ochthoeca jesupi Allen, should be 0. diadema jesupi Allen. 



Ochthoeca jesupi Allen, Bull. Amer. Mus. N.H. xiii. p. 151 (1900. San Lorenzo, Santa Marta, North 

 Colombia). 



No. 1. Amer. Mus. Nat. Hist., No. 72727, ? imm., S. Lorenzo, 7000 ft., 

 May 12, 1899, G. H. Hull. 



Type of 0. jesupi Allen. Wing 58 ; tail 49 ; bill 11 mm. 



So far as is possible to judge from a single immature specimen, this appears 

 to be a distinct form, most nearly allied to 0. diadema diadema (Hartl.). It 

 resembles the Bogota bird in the coloration of the wings, but may be recognised 



* In the original description the measurements, by misprint, are given as follows : wing 54 ; 

 tail 46 mm, 



