8 Mr. Alfred R. Wallace on the 



becoming longer as they approach the middle. In A. ery- 

 thrauchen, on the other hand, the two outer tail-feathers on each 

 side are decidedly longer than those which follow them, agreeing 

 in this respect with A. rhodogaster. I may here mention that 

 in correcting the erroneous measurement of the wing originally 

 printed I merely noticed the palpable error of two inches; there 

 is, however, a smaller error of a quarter of an inch in the same 

 direction, the actual length of the wings of my type specimen of 

 A. erythrauchen being 6*583 in., while those of A. rubricollis are 

 8-25 in. The distinct form of tail will, I presume, be admitted 

 by Dr. Kaup to be proof positive of the specific distinctness of 

 these birds. ScblegePs figures in the work quoted are of small 

 size, but they seem to indicate the diflPerence now pointed out. 

 They also show the same difference of colour as in my specimens, 

 the male (fig. 3) having the breast and belly entirely rufous as 

 well as the smaller female (fig. 1), like my type of A. erythrauchen, 

 while the large female (fig. 2) has the breast and belly ashy as 

 in my type of A. rubricollis. I am not aware that such a marked 

 sexual difference of colour, as this would be, exists among the 

 Hawks. My specimen from Morty Island is a very young bird, 

 but it seems to belong to this species. 



{Erythrospiza, Kaup.) 



5. AcciPiTER TRiNOTATUs, Bp., Consp. Av. i. p. 33 ; Nisus 

 trinotatus, Schleg., Mus. P.-B. Astures, p. 45 ; Valkv. Nederl. 

 Ind. pi. xix. fig. 1-3. 



Bill and cere above the nostrils black ; cheeks and orbits 

 orange-yellow ; feet deep orange-yellow ; iris chrome-yellow. 



Hab. Celebes (Macassar and Meuado) [Wall.). 



This is one of the most beautiful Hawks in the East, the con- 

 spicuous white spots on the tail being displayed during flight. 



6. AcciPiTER lOGASTER (S. Mlill.) ; Falco iogaster, Miill., 

 Verb. Nederl. Overz. Land- en Volkenk. p. 110; Hombr. & 

 Jacq., Voy. au Pole Sud, pi. ii. ; Nisus iogaster, Schleg., Mus. 

 P.-B. Astures, p. 43, Valkv. Nederl. Ind. pi. xviii. 



Bill black; iris deep orange - yellow ; cere, eyelids, and feet 

 orange. 



Ilab. Ccrnm, Amboyna {Wall.). 



