AET. 4 BIRDS OF THE MENTAWI GROUP RILEY 23 



The two Siberut specimens a^ee with those from Simalur in size, 

 but are of a lighter, less rufescent brown on the back; they are in 

 more worn, less fresh plumage, however. 



There is a young female, in the United States National Museum 

 (179947), from South Pagi Island which has the top of the head 

 brownish olive instead of deep mouse gray; back lighter and more 

 rusty brown; secondaries outwardly edged with tawny; lower mandi- 

 ble horn color, except at tip. These differences are due to age in 

 my opinion. 



Five males of M. g. grisola, measure: Wing, 82-87 (83.9) ; culmen, 13-15 



(13.9) mm. 

 Type of M. g. nesiotis (Simalur) : Wing, 87; culmen, 15 mm. 

 The male from Siberut : Wing, 85 ; culmen, 17. 

 Two females of M. g. grisola: Wing, 77-83 ; culmen 13.5-14. 

 One female from Simalur : Wing, 86 ; culmen, 15. 

 One female from Siberut : Wing, 83 ; culmen, 15. 

 One immature female from South Pagi : Wing, 79 ; culmen, 15. 



HYPOTHYMIS AZUREA LEUCOPHILA Oberholser 



Eypothymis azurea leucophila Obeeholser, Proc. U. S. Nat. Mus., vol. 39, 



1911, p. 607 (North Pagi Island, W. Sumatra). 

 Eypothymis aznrea sipora Chasen and Kloss, Ibis, 1926, p. 287 (Sipora 



Island, W. Sumatra). 



Five males and one female, Siberut; five males and three females, 

 Sipora. 



The material submitted seems to be identical with the small series 

 in the United States National Museum from the Pagi Islands on 

 which the name leucophila was founded. 



On the west Sumatra islands the following species and forms are 

 found : 



Hypothymis aihotti Richmond, Pulo Babi and Pulo Lasia. 

 nypothymis azurea consoirina Richmond, Simalur Island. 

 Hypothymis azurea amelis Oberholser, Nias Island. 

 Eypothymis azurea isocara Oberholser, Banjak Islands. 

 Eypothymis aznrea ponera Oberholser, Batu Islands. 

 Eypothymis azurea leucophila Oberholser, Mentawi Islands. 

 Eypothymis azurea rlchmondi Oberholser, Engano Island. 



The Mentawi form is the only one in the above list with a white 

 belly, and it is more nearly related to the subspecies occurring on 

 Sumatra. 



CULICICAPA CEYLONENSIS AMPHIALA Oberholser 



Culicicapa ceylonensis amphiala Oberholser, Smiths. Misc. Coll., vol. QOr 



no. 7, 1912, p. 12 (North Pagi Island, W. Sumatra). 

 Culicicapa ceylonensis percnocara Chasen and Kloss, Ibis, 1926, p. 288. 



Three majes, two females, and one unsexed skin, Siberut. 

 The series agrees with two males (one the type) from North Pagi 

 Island. 



