216 Notes on Mr. R. B. Sharpe’s Catalogue of Accipitres. 
there can, I think, be no doubt that the Thayetmyo race is 
considerably smaller than the Indian ; but I cannot say that 
it seems to me to be entitled to specific separation.” 
Mr. Hume is disposed to identify these small Thayetmyo 
birds with Pernis brachypterus of Blyth. This view is pro- 
bably correct ; but, at the same time, it should be borne in 
mind that Mr. Blyth stated that, in the specimen for which 
he proposed the specific name of brachypterus, the “ primaries 
were not fully grown” (vide ‘ Journal of the Asiatic Society 
of Bengal,’ extra no. for August 1875, p. 60). 
The following are measurements which I have taken from 
various insular specimens of P. ptilorhynchus. 
Wing. Tarsus. Mid. toe s.w. 
From Java, in the Derby Museum, 
= ILISGOOO! . ooo rocccbccengnagar 17'8 2-0 2:0 
From near Batavia, Java, in the 
Norwich Museum (marked ¢ by 
the collector, Dr. Bernstein)... . 174 2:2 2:3 
From South-Eastern Sumatra, in 
the collection of the late Lord 
Uweeddalonnras wets terse csi 17:0 2-2 271 
From Western Sumatra, in the col- 
lection of Lieut.Wardlaw Ramsay 17°73 20 2:2 
From Borneo, in the collection of 
Canon brishra mars rye ier leraras WA} 2:2 2:0 
From the Philippine Islands, in the 
Derby Museum, Liverpool .... 16:6 2:0 2.0 
From the Philippine Islands, in the 
INorwachyMuse um are). sa) 16:0 1:9 19 
From Butuan, in the Island of Min- 
danao, in the collection of the late 
Lord Tweeddale (marked 9 by 
the collector, Mr. Everett) .... 15:5 2:0 2:0 
The third, and only other known, species of the genus 
Pernis is P. celebensis, peculiar to the Celebes islands, and 
remarkable for the extraordinary similarity of its markings 
and coloration to the adult (but not to the immature) plu- 
mage of Limnaétus lanceolatus, the powerful Hawk-Hagle, 
which is also restricted to the Celebes group. This species 
does not appear to be subject to individual variations of plu- 
