32 



BULLETIN 15 3, UNITED STATES NATIONAL MUSEUM 



A male, not fully adult, from Tindiga, Tanganyika Territory, 

 surpasses all of these birds in the size of the culmen. Its measure- 

 ments are: Wing, 37G; tail, 144; culmen, 185 millimeters. Granvik*^ 

 gives the following measurements for a full-grown male taken at 

 Ivendu, Kavirondo Gulf, Kenya Colony: Wing, 385; culmen, 170 

 millimeters. 



The specimens listed above as measured by Mearns have not been 

 examined by me but the wing lengths are probably too great. My 

 measurements are made from the bend of the wing to the tip of the 

 longest primary, while it seems that Mearns measured to the tip of 

 the longest tertial. The tertials are so frayed out that they must 

 be unusually subject to wear and, therefore, I have not considered 

 their length as a reliable size criterion. 



In immature birds the head and neck are feathered; the feathers 

 on the chin, throat, and underside of the neck are mostly white with 

 a very few dark gray-black ones showing here and there, while the 

 feathers of the dorsum of the head and neck are gray-black much 

 mixed with whitish, especially on the crown w^iere each one is 

 completely edged w4th white. 



The extent of the dark coloration on the tips of the outermost 

 primaries varies individually. In some specimens it extends farther 

 back on the outer than the inner webs, in others the reverse is true, 

 while in still others the distribution is equal in both webs. Sex 

 and age have nothing to do with these differences. 



The birds from Ethiopia and northern Kenya Colony (Hor and 

 Kisumu) have the innermost secondaries and the tertials much more 

 purplish in color than do specimens from southern Kenya Colony 



"Journ. f. Ornith., 1923, Sonderhcft, p. 43. 



