AVIFAUNA OF LAYS AN, ETC. 



211 



Key to the Genera of the Drepanid^e. 



A. Bill much longer than the head and very strongly curved. 



a. General colour greenish. 



a\ Mandible of about half the length of the maxilla Heterorhynciius. 



b\ Mandible much longer than half the maxilla, nearly as long as the 



maxilla Hemignathus. 



b. General colour blackish. 



c\ Bill more strongly curved • under tail-coverts normal Drefanorhamfhus. 



d\ Bill less curved ; under tail-coverts elongated and loose-webbed . . . Drepanis. 



c. General colour red Vestiaria. 



B. Bill in length about equal to the head, straight or gently curved. 



d. A crest of curled feathers on the forehead Palmerta. 



e. No crest on the f orehead. 



e\ Bill in appearance more that of an insect-eating bird, its height at base 

 not more (mostly much less) than half the length of the mandible. 

 a 2 . Bill slender and perceptibly curved ; second primary longer than the 

 sixth ; nostrils fully covered with a membrane. 



a 3 . Plumage red Himatione. 



b\ Plumage greenish Chlorodrefanis. 



b\ Bill slender but straight ; second primary shorter than the sixth ; 



nostrils with an open slit Oreomyza. 



c 2 . Bill strong and conical. 



c 3 . Culmen nearly an inch long Viridonia. 



d 3 . Culmen about half an inch long. 



a\ Mandible curved to the right, so that its tip is visible 



laterally beyond the maxilla Loxops. 



b\ Mandible following the maxilla Ciridops. 



f\ Bill finch-like in appearance, its height at base more than half the length 

 of mandible. 

 d 2 . Bill as high as it is long. 



e\ Bill less than 05 in. ; head yellow Loxioides. 



/ 3 . Bill more than 0*5 in. ; whole upperside green Chloridops. 



e\ Bill considerably longer than high. 



g 3 . Maxilla considerably longer than mandible. 



c\ Maxilla much curved and laterally much compressed, much 



narrower than mandible Pseudonestor. 



d\ Maxilla less curved, not compressed, about as wide as 



mandible Psittirostra. 



A 3 . Maxilla very slightly longer than mandible. 



e\ Operculum of nostril small; wings shorter; mandible at 

 gonys distinctly convex, cutting-edges a little drawn in 



and less sharp Telespiza. 



f\ Operculum of nostril overhanging nearly the whole nostril ; 

 wings longer; mandible at gonys almost flat, cuttmg- 

 edges not drawn in and very sharp Khodacanthis. 



2 Gr 



