242 AllDEID^. 



evanescent on the lower back and nimp ; upper tail-coverts uniform 

 slaty black ; tail also slaty black ; wing-coverts like the back and 

 waved in the same manner ; bastard-wing and primary-coverts 

 slaty black, with scarcely any indication of cross lines ; quills 

 slaty black, with a considerable amount of white at the base of the 

 inner webs ; crown of head very fully crested, slaty black ; sides of 

 face black, barred with wavy lines of sandy buii : cheeks and throat 

 whiter, with blackish cross bars, more distinct on the lower throat ; 

 fore-neck and chest sandy buff, freckled with wavy lines of blackish, 

 with here and there a broader bar of black ; sides of the body sandy 

 buff, with blackish vermiculations and central streaks of black ; 

 abdomen and under tail-coverts white, with a few wavy markings ; 

 under wing-coverts and axiUaries white, with a tawny tinge. Total 

 length 9'5 inches, culmen 1-65, wing 5-7, tarsus 2-2, tarsus 1-5. 



Hufous phase. Differs from the dark phase described above in 

 being much more coarsely vermiculated with rufous on the upper 

 surface : the head black, but having a rufous forehead ; the throat 

 and under surface of body tawny rufous, becoming chestnut on the 

 sides of the face and the neck-frill, and inclining to white on the 

 lower abdomen and under tail-coverts ; on the breast, abdomen, and 

 flanks a few shaft-lines of black ; under wing-coverts and asillaries 

 white, with a slight tawny tinge. Total length 13 inches, culmen 

 1"5, wing 5'6, tail 2*2, tarsus I'o. 



The rufous birds appear tome to be perfectly adult ; and I think 

 it must be a mistake to consider them to be the young of the dark 

 phase, as many authors have done. The dark-coloured specimens 

 in the Museum also seem to me perfectlj' adult, but Prof. Schlegel 

 has also described a young bird in the same plumage. Thus I regard 

 the two birds as phases of one species, but it is quite probable that 

 they may be specifically distinct. 



Hah. Guiana to Central Brazil. 



31. NANNOCNUS. ^ 



Type. 



Nannocnus, Stejn. Proc. U.S. Nat. Mits. x. p. 291 



(1887) N. em-ythmus. 



Range. From Eastern Siberia and Japan, south through China to 

 Borneo. 



1. Nannocnus eurythmns. 



Ardea (Ardeola) cinuamomea (nee Gm.), Schreyick, Reis. Amurl, 

 p. 447, pi. 13. fig. 3 (1860 : Amoor) ; Radde, Reis. Sibir., J'og. ii. 

 p. 344 (1863). 



Ardetta eurythma, Simnh. Ibis, 1873, p. 74, pi. 2 (Amoy ; Shang- 

 hai), 1875, p. 132 (Chefoo), p. 455 (Hakodate) ; id. Ibis, 1876, 

 p. 335; Tacz. J.f. 0. 1875, p. 250 (Ussuri Delta, breeding) ; id. 

 Bull. Soc. Zool. France, i. p. 259 (1876) ; David <§• Oust. Ois. Chine, 



