22 



BIRDS OF THE HAWAIIAN GROUP. 



ranging form in suitable localities, North America southwards. Hawaiian Islands 

 The following table of measurements are from specimens in the Museum : 



38. 



PI. XXIII. 



Adult. 



Wing 12.50 



Tail 4.60 



Culmen 3.25 



Tarsus 2.95 



Middle toe 3.45 



Depth of bill 85 



N. nycticorax nsevius" (Bodd.). 

 , 5584, 9170. 



Males. 



Adult. Juvenile. 



Fevialcs. 



Adult. Juvenile. 



Black-crowned Night Heron, Auku kohili 



Order PALUDICOL^.-Rails, Coots, Etc. 



Family. 



First primary longer than the seventh; wings less than 10 inches (except ii 

 Porphyria):, toes very long and slender, with "scallops" along the side in Fulica; tai 

 usually quite rudimentary (Page 22.) Rallidae 



Family RALI/ID-^. — Rails, Gallinules and Coots. 



Genera. 

 a. No enlarged shield-like process extending over the front part of the head 

 (Sub-family Rallincs;) middle toe and claw exceeding the length of the tarsus ; sec 

 ondaries pra6lically equal to the primaries in length, or falling short of them by les: 

 than the length of the hind toe and claw. 



b. Tail feathers very soft and entirely hidden at the ends by the covert; 



(Hawaii) (Page 23.) Pen'nula 



bb. Tail feathers not decomposed but ordinary and evident with no whiti 

 secondary quills, the inner toe without the claw longer than the culmen; plumagi 

 variegated ; wings feebly developed and not as long as the tarsus and toes combined 



(Page 23.) Porijan'ula 



aa. An enlarged frontal shield. 



C. Toes without lobes or flaps. (Sub-family Gallinulince.) 



d. Nostrils oval, in a distinct nasal depression; frontal shieL 



rounded; wings nearly three times' the length of the tarsus. . (Page 23.) Gallin'ula 

 dd. Nostrils rounded ; no nasal depression ; plumage blue (win| 



coverts ordinary); primaries much longer than secondaries. . (Page 24.) Porphy'rio 



21 The Hawaiian A uku seems not to differ from the American sub-species by any constant characfter. 



f278] 



