on the Genus Coereba. {501 



Ten specimens from Panama. Brit. Mus. 



Seven specimens from Panama. Coll. Rothschild. 



This subspecies of C. mexicana differs from typical speci- 

 mens in possessing an olive-yellow rump-patch as compared 

 with olive-green in Mexican examples^ and iu having the 

 mantle ashy brown instead of olive-grey. The wing-spots 

 in specimens from Bogota tend to be somewhat larger and 

 the yellow of the under parts somewhat richer (olive-yellow 

 as compared with greenish yellow — chloi^otic). 



In my opinion^ with the material available, there seems 

 to be little doubt about the constancy of the distinctly more 

 yellowish coloration of the rump in typical specimens from 

 Columbia. 



Ten examples from Panama in the British Museum 

 Collection also exhibit it, but specimens from Chiriqui 

 and Veragua (coll. Rothschild) agree with specimens from 

 Vera Cruz (typical C. mexicana), from which it would seem 

 probable that the two races meet or intermingle somewhere 

 about the line of the Panama Canal. 



Two specimens labelled " Juntas (Western Columbia) " 

 in the Tring Collection seem to be undoubtedly examples 

 of C luteola. 



Mr. Hellmayr (/. c.) has recently determined the West 

 Columbian form as a subspecies of C. chloroptjga. I have 

 already noted, in the introductory remarks to this paper, the 

 objections to such a proceeding, for C. cMoropyga belongs 

 to a distinct group characterized by the absence of a white 

 wing-spot, and which, moreover, is restricted to land-areas 

 having quite a distinct geological history. 



CffiREBA MEXICANA INTERMEDIA. 



Certhiola intermedia Salvadori & Testa, Boll. Mus. Zool. 

 Torino, xv. no. 357, 1899, p. 13 ; Ridgway, Birds N. & M. 

 Amer. pt. ii. p. 407 (footnote, synonymy). 



Type locality. Valley of Zamora, Gualaquiza, Ecuador. 



Hab. Ecuador. 



Specimens examined. Twenty-eight. 



The specimens which I have examined from all parts of 



2m2 



