1875.] THE PHILIPPINE AECHIPELAGO. 307 



lerax erythrocjenys, Vig., G. E. Gray, Hand-list, no. 221. 



lerax sericeus, Kittlitz, G. R. Gray, torn. cit. no. 222. 



Hah. Luzon [Meyer). 



Kaup in 1850 (Contrib. Orn. 52) united //. erythrorjcnys with //. sericeus, applying Vigors's 

 title to the male, and that of Kittlitz to the female. Dr. v. Martens (J. f. O. 18G6, p. 9) 

 suggested that the two titles belonged to one and the same bird. Mr. J. H. Gurney writes to 

 me that he considers H. erythrogenys, Vigors, to be the female (and probably the young male 

 also) of //. sericeus (Kittlitz) ; also that M. Jules Verreaux had ascertained by dissection that Tr. Z. S. is. 

 H. sericeus and H. erythrogenys were male and female of the same species. Perhaps it will be 

 eventually shown that the adults of both sexes do not differ in coloration, and that the rufous 

 cheeks are a sign of nonage common to both sexes. Dr. Meyer's examples are all in the sericeus 

 plumage ; and some are marked by him as male, and others as female. In one of the latter the 

 wing measures a full half inch longer than in the males; and the other dimensions are 

 proportionally greater. 



H. ccerulescens evinces a somewhat analogous tendency, the white forehead and supercilium 

 of the adults being rufous in a prior stage of plumage. And this is also to be observed in 

 H. eutolmus, where, however, the chin and throat are white in the young bird, instead of 

 ferruginous as in the adult. 



On the authority of M. de la Gironniere (Bonite, /. c.) the Philippine Hierax is stated to 

 appear in Luzon only in the spring; and the inference is drawn that it is migratory. Dr. Meyer 

 obtained his specimens in January and April. 



In the Hand-list (/. c.) Mr. G. R. Gray notes //. sericeus as occurring in North China. It 

 is not included in either Mr. vSwinhoe's list (P. Z. S. 1871), or in that of M. Armand David 

 (N. Archiv. Mus. vii.). Mr. Swinhoe, however, recently observed a species of Hierax in a 

 collection made by Pere Heude near Shanghai (Ibis, 1873, p. 95) ; but he does not identify the 

 species. 



Hierax melanoleucus, Blyth, is treated by Mr. Strickland (Orn. Syn. p. 104) as a synonym of 

 //. sericeus, whereas the Assamese Hierax is a very distinct and well-marked species. It differs 

 in having black cheeks, white lores, a white superciliary stripe continued along the sides of the 

 head to the neck, white shoulder-edge and under shoulder-coverts, and in having all the rectrices 

 except the middle pair with five or more white spots on theii- inner webs, and all the quills 

 numerously barred with white. In the Philippine species the tail-feathers, quills, and under 

 shoulder-coverts are black, some of the quills being indistinctly mottled with dirty white. It 

 possesses no supercilium ; and the cheeks are white. 



ACCIPITRIN^. 



LoPHOspizA, Kaup. 



11. LOPHOSPIZA TKIVIRGATA. 



Falco trivirgatus, Temm. PL Col. 303, "Sumatra " (1824). 



Astur cristatus, G. R. Gray, Ann. N. H. xi. p. 371, " Philippine Islands" (1843). 



