124 BULLETIN : MUSEUM OF COMPA.RATIVE ZOOLOGY. 



This remarkable species is named for Professor Alexander Agassiz, who was 

 in charge of the work of the "Albatross" at the time Cocos Island was visited. 



Nesotriccus, gen. nov.i 



Allied to Eribates of the Galapagos Islands, but with bill relatively onger 

 and more liatteiied. Culmen separating the nostrils as a prominent ridge. 

 Gonys less than half the length of lower mandible, terminating in advauee of 

 nostrils. Tail relatively shorter. 



Type Nesotriccus Ridgwayi, sp. nov. 



Specific characters. Distinguished from the allied Eribates magnirostris in 

 having no trace of rufous on inner webs of tail feathers, and no ashiness of 

 throat and breast. It is also smaller, with nostrils separated by a sharp ridge. 



Hab. Cocos Island. 



Adult male (Type No. 131691, Cocos Isl., Feb. 28, 1891, C. H. T.). 

 Above olive, brightening to olive-buflF on rump ; tips of middle and greater 

 wing coverts creamy buff; wings and tail dusky, with narrow olive-buff 

 eflgings. Below olive, suffused with yellow, brighter on belly and under wing 

 and tail coverts, darker on breast and sides of head and neck : throat pale buff. 

 Bill dark brown, with posterior half of lower mandible pale yellow. Legs and 

 feet dark brown. Length (skin), 5.25 in.; wing, 2.40; tail, 2.20; culmen, 

 .55; gonys, .35 ; bill from rictus, .80; depth at base, .18 ; tarsus, .80; middle 

 toe, .45. 



Only one specimen of this bird was obtained, and to the be.st of mj'' recollec- 

 tion only two or three others seen. They were observed among the tree-ferns 

 in a deep ravine at Chatham Bay. The species is named for Mr. Robert Ridg- 

 way, Curator of Birds in the U. S. National Museum. 



Coccyzus ferrugineus, Gould. {Nesococcyx, Cab.) 



Cocci/zus ferrugineus, Gould, Proc. Zoiil. See, 184.3, p. 104. Zool. Voy. Sulph., 



Birds, I. p. 46. 



Only two specimens of this bird were obtained, and not more than three or 

 four others seen. As in the case of the warbler (Dendroica) its relationships 

 are with species inhabiting the West Indies, rather than with the forms of the 

 mainland. The genus was not known to the Galapagos Islands until the 

 voyage of the " Albatross," in 1888, when two specimens of Coccyzus melano- 

 coryphm Vieill., a mainland form, were secured on Chatham and Charles 

 Islands. 



1 vria-os — island ; Triccus — a, genus of tyrant flycatchers. 



