FROM WESTERN SU.MATRA. » 



The third specimen is not dotted above at all , only the 

 secondaries being tipped with white. The throat of this 

 example is ashy grey, the chest grayish brown, without 

 any vermiculations. The lesser wing-coverts are faintly tip- 

 ped with clear brown. 



The fourth specimen differs from the second by the ashy 

 gray chin and throat , and by having the wing-coverts pro- 

 vided with two very obvious white dots at the tip of each 

 feather. 



The fifth is characterised by the want of clear spots on 

 the upper surface. The lower surface is uniform brown with- 

 out paler edgings and vermiculations on the chest. Breast, 

 abdomen , flanks , thighs and under tail-coverts are covered 

 with rounded white spots, without the least tendency to 

 form cross-bars as is the case with the other specimens. 



The length of the wing varies between 35 and 37,5 cm. 



All five specimens are collected between the 15*^ of No- 

 vember and the 24:^^ of December. 



With the exception of the white edgings to the tips of 

 the feathers on the upper surface and the two distinct 

 white bars on the tail instead of a single one, which cha- 

 racters undoubtedly indicate a young stage of plumage , I 

 consider all the many differences in color due to indivi- 

 dual variation only , as is the case with our Buteo vulgaris , 

 and not to sex, age nor locality. The strongest evidence 

 for this opinion is the young specimen in the Leyden Mu- 

 seum , figured in Schlegel , 1. c. pi. 22 , fig. 3 , which shows 

 that the plumage of the young bird is , with the exception 

 above mentioned, not different from that of the adult. 



5. P e r n i s p t il r h y n c h a. 



Falcu ptilorhynchus, Temm. P. C. I. 44 (1823); — Mull. & Schl. Verb. 



Aves, p. 49, pi. 7 (1839—44). 

 Pernis crisiatus (Cuv.), Schl. Valkvogels (1. c), pp. 39, 73, pi. 25, 26 



(1866); id. Revue Accip. p. 1.31 (1873); — Tweedd. Ibis 1877, 



p. 286. 

 Pernis pdlorhyncha, Salvad. Ucc. di Borneo, p. 9 (1874). 



Notes from the Leyden IMuseiim, Vol. IX. 



