ART. 4 BIEDS OF THE MENTAWI GROUP EILEY 31 



ORIOLUS CUINENSIS SIPORA Chasen and Klosa 



Oriolus cMnensis sipora Chasen and Kloss, Ibis, 1926, p. 294 (Sipora 

 Island). 



Five adult males, six adult females, and one immature female, 

 Sipora. 



The only difference I can detect between O. c richmondi of the 

 Pagi Islands and the present form is in the color of the wings. In 

 sipora the inner primaries are more extensively margined with gray- 

 ish or yellowish-white on the outer web and at the tip and the inner 

 secondaries and tertials have the yellow outer web at the tip more 

 extensive. These differences seem quite constant. There appears to 

 be little or no difference in size between the two series. 



Five males from Sipora measure: Wing, 149.5-154.5 (151.4) ; culmen, 



32-33.5 (32.5). 

 Six males from North Pagi (5) and South Pagi (1) measure: Wing, 



145.5-152.5 (150.7) ; culmen, 31.5-33 (32.6). 

 Six females from Sipora: Wing, 146.5-152 (149) ; culmen, 31-33 (31.9). 

 Three females from South Pagi: Wing, 141-152 (147.7) ; culmen, 32-34.5 



(32.8). 



ORIOLUS CHINENSIS SIBERU Chasen and Klogs 



Oriolus cMnensis siberu Chasen and Kloss, Ibis, 1926, p. 294 (Siberut 

 Island). 



Five adult males, one immature male, four adult females, one imma- 

 ture female, and one without sex, Siberut. 



More greenish on the back than in sifora with less extensive white 

 margins to the inner primaries and less yellow on the outer web of the 

 inner secondaries and the tertiaries. In the latter character resem- 

 bling Hchmondi^ but the back more greenish. There appears to be 

 little or no difference in size between sipora and siberu^ except the 

 latter on the average has a longer bill. 



Five males from Siberut measure, wing, 146-156 (151.7) ; culmen, 33-34 

 (33.5), and four females; wing, 141.5-151 (145.4) ; culmen, 31.5-33.5 

 (32.4). 



Oriohis cMnensis mundus of Simalur Island is a very distinct form 

 with no speculum in the wing and the yellow on the tertials much 

 reduced; the bill longer than any other Barussan Island form. It 

 needs no comparison with the Mentawi forms. 



ORIOLUS XANTHONOTUS MENTAWI Chasen and Kloss 



Oriolus xcmthonotus mentaim Chasen and Kloss, Ibis, 1926, p. 295 ( Siberut 

 Island). 



Four adult males and one adult female, Siberut ; one adult and one 

 immature male, Sipora. 



