5l8 SNODGRASS AND HELLER 



tively longer and more flattened. Culmen separating the nostrils as 

 a prominent ridge. Gonys less than half the length of lower man- 

 dible, terminating in advance of nostrils. Tail relatively shorter." 

 (Townsend.) 



NESOTRICCUS RIDGWAYI Townsend. 



Nesotriccus ridgwayiTow^s^HD, Bull. Mus. Comp. Zool. , xxvii, p. 124, 1895 

 (Cocos Island). 



Range. — Cocos Island. 



Adult (sex unknown). — Cat. No. 501^4, Stanford University 

 Museum, from Cocos Island, June 30, 1S99. Above dusky-olive, be- 

 coming pale rufous on the upper tail coverts, a tinge of the same color 

 on the hind neck. Tail feathers brown with buffy edgings and fading 

 into buff terminally. Middle and greater wing coverts with wide, 

 pale rufous tips. Wing quills dusky brown with buff edgings, the 

 latter widest on the secondaries. Below much lighter olive than above, 

 darkest across the breast, pale and yellowish on the belly, becoming 

 buff on the crissum. Throat whitish. Under ^ving coverts yellowish- 

 olive. Upper mandible dark brown, lower mandible light brown, 

 darker at tip. Feet black. Length 145 mm., wing 58, tail 52, 

 culmen 16, depth of bill at nostril 4, maxilla from nostril 10.5, width 

 of bill at base 6, tarsus 19, middle toe 9.5. 



This species, according to Townsend, is " distinguished fi'om the 



allied Eribates (^Myiarchus) 7nagni7'ostris in having no trace of 



rufous on inner webs of tail feathers, and no ashiness of throat and 



breast. It is also smaller with the nostrils separated by a sharp 



ridge." 



CHELIDON ERYTHROGASTER .? 



One individual seen flying over Clipperton Island in November. 



COCORNIS AGASSIZI Townsend. 



Cocornis agassiziTo\YT>iSY.^v>, Bull. Mus. Comp, Zool., xxvii, No. 3, p. 123, 

 1895 (Cocos Island). 



Range. — Cocos Island. 



Adult Male. — Cat. No. 505S, Stanford University Museum, from 

 Cocos Island, June 30, 1899. Uniform, almost glossy, black except 

 the under tail coverts which are tipped with buffy-gray. Primaries 

 and secondaries brownish-black on inner webs, rectrices dusky-brown 

 below. Bill entirely black. Feet blackish-brown. 



Immature Male. — Cat. No. 1259, Stanford University Museum, 

 from Cocos Island, June 30, 1899. Above sooty-black on the central 

 parts of the feathers, the feathers of the head with very narrow buffy 



