16 



BULLETIN 17 2, UNITED STATES NATIONAL MUSEUM 



Collocalia linchi elaclujptera. 

 Rarnphalcyon capensis hydrophila. 

 Graucalus sumatrensis messeris. 

 Dissemurus paradiseus messatius. 

 Dissemurus paradiseus hypohallus. 

 Dissemurus paradiseus mallomicrus. 

 Anuropsis malaccensis driophila. 

 Stachyris nigriceps dipora. 

 Mixornis gularis chersonesophila. 

 Mixornis gularis archipelagica. 



Hypothymis azurea forrestia. 

 Culicicapa ceylonensis antioxantha. 

 Lamprocorax panayensis halictypus. 

 Aethopyga siparaja heliotis. 

 Cinnyris ornata heliobleta. 

 Arachnothera chrysogenys astilpna. 

 Arachnothera longirostris anlelia. 

 Arachnothera longirostris heliocrita, 

 Uroloncha acuticauda lepidola. 



(3) By J. H. RILEY 



Cyanops franklini trangensis. 



A number of the foregoing forms are not now recognized, but as they 

 will be dealt with in the text, it is not necessary to go into the question 

 of their vaUdity here. 



ZOOGEOGRAPHY OF THE REGION 



The geography of the Malay Peninsula has been given in some detail 

 by H. C. Robinson ^ to whose account the reader is referred. 



Siam, lying between Burma on the west and north and Indochina on 

 the east, has no distinctive avifauna. The Peninsular part, being- 

 between Peninsular Burma on the north and the Malay States on the 

 south, is intermediate in location, but predominantly Malayan ia 

 its fauna. 



Kloss * has proposed to divide the country into sLx zoogeographical 

 divisions for convenience, as follows: 



(1) Northern Siam. The Laos country, mostly mountainous or 

 submontane, north of latitude 18° N., between the mouth of the Me 

 Mue or Thoungyin River, an affluent of the SalA\an, and the great 

 eastern bend of the Mekong. 



The avifauna is characterized principally by the extension south- 

 ward of many Burmese species. 



(2) Central Siam. The great watered plain of the Menam Chao 

 Phya and its tributaries, south of upper Siam, including the low- 

 lands of the basin of the Bangpakong River in the southeast and tho 

 lower reaches of the Me Klav/ng and Petchaburi Rivers in the south- 

 west. 



No distinctive birds occur in the division. 



(3) Western Siam. The hill country between the Tenasserim 

 frontier and the Menam lowland plain from the Me Mue River mouth 

 south to Koh Lak. This region was divided later into western and 

 southwestern Siam. 



(4) Peninsular Siam. From the Isthmus of Kra south to the 

 Malay States. 



» The birds of the Malay Peninsula, vol. 1, pp. xiii-xxix. 1927. 

 < Journ. Nat. Hist. Soc. Siam, vol. 1, pp. 250-251, and map, 1915. 



