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Show 226 MR. A. H. EVERETT ON THE ZOO-GEOGRAPHICAL [Apr. 16, T A B L E III.-Showing the Palawan Species which are identical with or allied to Species inhabiting Borneo or western Indo-Malaya, but which are not found in the Philippines except as migrants or stragglers. Species peculiar to the Palawan group are distinguished by the prefix of a dagger. t29. Eulabes palawanensis. 1*30. Corone pusilla. 31. Batrachostomus cornutus. tl. Cittocincla nigra. 2. Orthotomus ruficeps. 13. Mixornis woodi. 1*4. Turdinus rufifrons. to. Ptilocichla falcata. 16. Anuropsis ciuereiceps. t7. Iole striaticeps. 8. Micropus melanocephalus. t9 110. til. 12. tl3. tl4. 15. Criniger frater. palawanensis. Pycnonotus cinereifrons. yEgithina viridis. Chloropsis palawanensis. Irena tweecldalii. Oriolus xanthonotus. 16. Dendrophila frontalis. 1*17. Hyloterpe whiteheadi. Buchanga leucophsea (?), Artamides sumatrensis. Pericrocotus igneus. Cryptolopha montis. Siphia banyumas. erithacus. 18. 19. 20. 21. 22. 1*23. 24. 25. t26. 127 Chalcostethia insignis. Anthreptes malaccensis. Arachnothera dilutior. Prionochilus Johanna?. 28. Munia atricapilla. 32. Caprimulgus macrurus. 33. Mulleripicus pulverulentus. 134. Thriponax hargitti. 1*35. Tiga everetti. 36. Alcedo asiatica. 37. Ceyx rufldorsa. 38. Halcyon coromanda. 39. pileata. 140. Anthracoceros lemprieri. 41. Cuculus sonnerati. 42. Surniculus lugubris. 43. Chrysococcyx xanthorhynchus. 44. Eudynamis malayana. 1*45. Dryococcyx harringtoni. 46. Centrococcyx javanensis. 47. eurycercus. 48. Ninox scutulata. 1*49. Syrnium whiteheadi. 50. Spizaetus limnaetus. 51. Spilornis bacha. 1*52. Baza leucopias. 53. Turtur tigrina. 54. Treron nasica. "1*55. Polyplectron napoleonis1. A consideration of the foregoing tables reveals the facts : (1) that the only two genera of birds which are confined to the Palawan group, namely Dryococcyx artd Ptilocichla, are allied to genera belonging to the typical Indo-Malayan and not to the Philippine sub-area; (2) that the preponderance of the species belonging to the former sub-area over those belonging to the latter is as 55 to 31; and (3) that whereas of the 31 Philippine species only 9 have varied and become distinct forms confined to the Palawan group, no fewer than 24 of the 55 Bornean and western Indo-Malayan species have thus varied, the variation being also, as a general rule, more profound in character than is the case with the Philippine species. From these facts it is apparent that not only has a larger proportion of the existing bird-population entered the Palawan group from the Bornean side than has invaded it from the Philippines, but also that the western element represents the fundamental ornis, since it exhibits a markedly higher degree of differentiation, which is nearly certainly indicative of its greater antiquity and longer isolation. Thus the results obtained by an analysis of the avifauna of Palawan, so far as it is known, reinforce those already arrived at by our 1 Said to occur also in Luzon, but this locality is probably erroneous. |