78 Monograph of the Cranes. 



structure to be developed later in life. The degree of complexity of the trachea, is thus 

 shown to be dependent upon age, and the variations just alluded to are no doubt fully 

 accounted for by this fact. 



The exact relation between the extent of the convolutions and the age 

 of the individual has not been thoroughly worked out. I have recently- 

 dissected a Stanley crane, G. jMraJisea, about eight months old, in which 

 the tips of the scapulte and posterior margin of the sternum are perfectly 

 cartilaginous, and find exactly the same amount of convolution as in Mr. 

 Yarrell's adult specimen, a figure of which is given at page 22, ante — 

 W. B. T.] 



GRUS SCHLEGBLIT, Blyth. 



SCHLEGEL'S CRANE. 



Grus scHLEaiLii, Blyth, Field, vol. xlii., p, 419. (1873.) 



[Mr. P. L. Sclater writes as follows : — 



Ttiis is a very doubtful species. Soblegel (Mus. des Pays-Bas, Ralli, p. 2) refers the 

 specimen figured in the Fauna Japonica as Grus cinerea longirostris to Grus canadensis. 



I subjoin Mr. Blyth's short article.— W. B. T.] 



G. schlegelii : G. cinerea longirostris, Tem. and Sch., " Fauna Japonica, 

 Aves," pi. 72, but not the accompanying description, which applies to 

 G. communis. 



Schlegel's Crane. — Size nearly or quite that of the Common Crane, or 

 conspicuously larger than G. canadensis ; the plumage exactly as in 

 G. canadensis, but the crimson nude skin of the crown developed to only 

 about the same extent as in G. americana, and (I think I may venture to 

 assert with confidence) not furcate posteriorly as in G. canadensis. Precise 

 habitat unknown, but believed to be some part of North America, and 

 assuredly not Japan, though figured, by some strange mistake, in the 

 " Fauna Japonica." I have nothing further to add to what has been stated 

 in the account of G. canadensis. 



GRUS FRATERCULUS, Cassin. 

 Grus feateeculus, Cass. Birds of North America, p. 656, pi. 37. (1860.) 

 [Mr. P. L. Sclater writes : 

 This is likewise a very doubtful species, and probably only a small variety of Grus 

 canadensis. See my remarks in the Proc. Zool. Soc. 1868, p. 567 (quoted at page 73, 

 ante). 



Mr. Blyth's account is as follows :] 



O. fraterculus, Cassin; young figured in Baird and Cassin's "Birds of 



