1922.] 



Tsushima and Iki Islands. 



87 



conclusion that the Tsushima examples are easily separable 

 from the other forms in the following points : — 



The Tsushima exam[)le differs from )'. k. seehohmi in the 

 coloration of body being very mucli (hirker, especially the 

 dark area of upper [)arts, which is distinctly black, and by 

 the white s|)ots being decidedly smaller. It differs from 

 ]'. k. kizuki by the ii})per parts being blacker (not brownish 

 black), esi)ecially the mantle, which is almost pure black, 

 only faintly suffused with brown ; also the top of head and 

 nape are darker greyish brown^ the ear-coverts darker, 

 the white spots larger aud distinctly tinged with olive 

 on the back, and the wing and tail average longer. It also 

 differs from Y . k. nh/rescens in the general coloration of the 

 u])per parts being still blacker, by the white spots being 

 larger, and by the longer tail. 



The new form is distinctly larger than )'. k. kiztiki and 

 }'. k. nigrescens. The wing and tail of the last two forms as 

 well as another new form may be tabulated as follows : — 



The nund)er of the white spots on the outer web of the 

 primaries is no doubt variable and is not of much value, but 

 it seems to average G spots in seehohmi, 5 in kizuki, 4-5 in 

 nigrescens, and 5-0 (average; G) in the new form from 

 Tsushima [kotataki). The coloration on the underside of the 

 new form is not perceptibly different from that of kizuki. 

 The dimensions of the wing and tail of seehohmi (wing 

 81-87 mm., tail ^l-^y^i mm.) are almost the same as those 

 of the Tsushima bird. There is also gieat individual varia- 

 tion in the length of wing in the new form from the same 

 locality, as shown above (wing 81-86*5 mm.). 



