1904.] NATURAL SCIENCES OF PHILADELPHIA. 457 



notaeum more olivaceous; wing-quills much washed with olivaceous; 

 upper wing-coverts olive-brown in place of mostly chestnut; sides of 

 head more ashy; throat less whitish; lower sm-face paler, rather more 

 rufescent, and a slight ochraceous postocular stripe. It is very dis- 

 tinct from Dendrocmcla atrirostris bj^ reason of its decidedly darker, 

 more olivaceous upper parts ; olivaceous tinged wing-quills ; more 

 deeply colored, rather more olivaceous ventral surface; almost obso- 

 lete ochraceous postocular stripe; and lack of pale shaft streaks on 

 the pileum. 



Mr. Ridgway'^ was the first after Lawrence to recognize this species as 

 distinct from D. atrirostris, although it is much more closel}^ allied to 

 D. fuliginosa and D. merida than to D. atiirostris. The specimens 

 from Guayaquil, Ecuador, placed imder this form by Mr. Ridgway.*^ 

 belong, however, under D. olivacea lafresnayei, since true olivacea 

 must be restricted to Central America. Birds from Panama are in- 

 termediate between olivacea and lafresnayei, but nearer the former. 



Dendrocincla olivacea lafresnayei (Ridgway). 



Dendrocincla lafresnayei Ridgway, Proc. United States Xat. Mus., X, 1888, 



pp. 489, 492 (Upper Amazon?). 

 Dendrocincla olivacea lafresnayi Allen, Bull. Amer. ^lus. Xat. Hist., XIII, 



1900, p. 156. 

 Dendrocincla olivacea anguina Bangs, Proc. Biol. Soc. Wash., XII, 1898, 



p. 138 (Santa Marta, Colombia). 



Type Locality. — Upper Amazon River. 



Geographical Distribution. — Ecuador and Colombia. 



Like Dendrocincla olivacea olivacea in size ; but in color lighter, more 

 rufescent above and below, the lining of wing paler. From D. atri- 

 rostris it may be distinguished principally by lack of pale shaft streaks 

 on the pileum; obsolescent or absent ochraceous postocular stripe; 

 more olivaceous upper surface; and conspicuously more olivaceous 

 wings. 



As may thus easily be seen, lafresnayei is far more nearly related to 

 D. olivacea, D. fuliginosa, and even D. meridoides than to D. atrirostris, 

 although nearly all writers excepting Mr. Ridgway have, at least in part, 

 confused lafresnayei with atrirostris; and all records of atrirostris or 

 olivacea from Ecuador or Colombia refer undoubtedly to the present 

 form. Examples from. Ecuador seem to agree with the type, and those 

 from Colombia are not separable from either. A series of some eleven 

 specimens from the Santa Marta region, Colombia, including the type 

 and original suite of Mr. Bangs' D. olivacea anguina,^'' exhibits a 



18 Proc. U. S. Nat. Miis., X, 1888, p. 492. 

 " Proc. Biol. Soc. Wash., XII, 1898, p. 138. 



