AUT.4 BIRDS OP THE MENTAWI GROUP RILEY 33 



narrower above, broader below, and much narrower in width. In 

 my opinion Gratula rohusta is a well-marked species with its own 

 insular subspecies. 



The forms I am prepared to recognize from the islands off the 

 west coast of Sumatra are as follows : 



(1) Oracula rohusta rohusta Salvadori. Size large; culmen, 34r-38 

 (35.5), Nias Island and Pulo Babi. 



(2) Gracula rohusta ophcUochlora Oberliolser. Somewhat smaller; 

 culmeu, 32.5-34 (33.5). Banjak Islands (Pulo Tuangku). 



(3) Gracula javana miotera Oberholser. Somewhat like enganensis but 

 slightly larger; culmen, 28-30 (29.2;. Simalur Island. 



(4) Gracula javana hatucnsis Finseh. Larger than either tniotcra or 

 enganeims, especially the bill; culmen, 3(>-34 (32)."' Batu Islands 

 and Mentawi Islands (Siberut, Sipora, North and South Pagi). 



(5) Gracula javu)ia cn</a)icii.si>i Salvadori. Somewhat smaller than 

 batuensw the bill pronouncedly so; culmen, 25-30 (28).^* 



LAMPROCORAX PANAYENSIS PACHISTORHINUS Oberholser 



Lamprocorax chalyheus pachistorMnus Obebholsek, Smiths. Misc. Coll., 



vol. 60, no. 7, 1912, p. 17 (South Pagi Island). 

 Aplonis panai/ensis altirostris Chasen and Kloss, Ibis, 1926, p. 296. 



Seven males and three females, Siberut ; two males and four 

 females, Sipora. 



The United States National Museum possesses seven adult males 

 and three adult females from South Pagi Island. The birds from 

 Siberut, Sipora, and South Pagi Island apparently belong to one 

 form, but it is not the same as that from Nias Island {altirostris). 

 The Mentawi Island subspecies has a larger, heavier bill and is 

 slightly less glossy. 



Tlie specimens of this species in the United States National Mu- 

 seum from the islands off the west coast of Sumatra fall naturally 

 into three recognizable forms, to which is to be added a form de- 

 scribed from Pulo Pinie not here represented. They are as follows: 



(1) Lamprocorax panayensis altirostris. 



Calornis altirostris Salvadori, Ann. Mus. Civ. Stor. Nat. Gen., ser. 2, 



vol. 4, 1887, p. 553, pi. 9, fig. 1 (Nias). 

 Lamprocorax chalyheus rliacilnorhynchus Obekholsbir, Smiths. Misc. Coll., 



vol. 60, no. 7, 1912, p. 17 (Simalur). 

 Lamprocorax panayensis nesodramus Oberholsee, Jouru. Washington Acad. 



Sci., vol. 16, 1926, p. 516 (Pulo Babi). 



The Museum has specimens from Nias, Simalur, and Pulo Babi. 



s' Twenty-nine specimens. 

 ^ Eight specimens. 



22482—29 3 



