AVIFAUNA OF LAYSAN, ETC. 



Key to the Genus Chasicinpis. 



Wing-coverts spotted with tawny ocliraccous ; base of lower mandible 

 light. (Young.) 



a. Lighter tawny ochraeeous below C. sandwichensis, juv. 



b. Deeper tawny ochraeeous below C. gayi, juv., & C. sclateri 



Wing-coverts spotted with white ; base of lower mandible dark and con- 



colorous with tip. (Old.) 



c. Above greyish G sclateri, ad. 



d. Above brown. 



a\ White tips on outer tail-feathers more than half an inch long . (C. sandwichensis.) 



a\ Forehead white, and breast almost entirely white . . . C. sandwichensis, ad. 



b 1 . Forehead and breast tawny ocliraccous C. sandwichensis, mcd. 



b\ White tips on outer tail-feathers less than half an inch long . C. gayi, ad. 



