AVES. 339 



it is greyish. Cabanis also states that the northern form 

 has narrower tail feathers, and the dimensions are rather 

 smaller. I give those of a pair collected by myself : — 



I am somewhat surprised that all previous writers 

 should have overlooked Lord Stanley's description of 

 this bird. His measurements of the bill are not quite ac- 

 curate, but otherwise the description is excellent. I was 

 for some time puzzled by one character mentioned by 

 him, the presence of a chestnut spot on the sides above 

 the thighs ; but I find it in one of the specimens before 

 me, a female. ' In order to detect it, it is necessary in 

 general to turn up the long uropygial feathers. In a 

 male specimen I cannot detect it, so it is certainly not 

 constant, and may be sexual. It is noticed by Cabanis 

 as occurring also in L. collaris. 



83. Li. isabellinus. Hemp, and Ehr. 



Hemp, and Ehr., Symb. Phys., Aves. — ^Walden, Ibis, 1867, p. 224, 

 pi. V. f. 1. 



Common on the coast ia December, January, and 

 February. I shot it also near Massowa in August. In 

 June and July I did not observe it, and think it had 

 migrated. The only specimen of a male in fuUy adult 

 plumage agrees very weU with the figure and description 

 in the " Ibis." A female has the head much less rufous, 

 only the trace of a white band on the primaries, and 

 the under parts pale brownish, with a pinkish tinge. A 

 young bird wants both the band on the quills and the 



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