ART. 16. 



BIRDS FROM NORTH CELEBES RILEY. 



109 



The original description is as follows : 



Similar to Dieruropsis leucops but much smaller, especially the bill and feet ; 

 the metallic colors duller, more bronzy, and spots on the chest reduced in 

 size ; the tail more forked, the feathers narrower, and the outer pair lesal 

 flared outwardly. Wing, 131 ; tail, 138 ; culmen, 24 ; tarsus, 19 ; middle toe, 

 14 mm. 



In this genus there is practically no difference in color between the sexes and 

 very little difference in size ; females average slightly smaller. The three 

 females of Dieruropsis montana measure as follows: Wing, 133.5—140 (137.5) ; 

 tail, 133-152.5 (142.2) ; culmen, 24-24.5 (24.3) ; tarsus, 19.5-20 (19.7) ; middle 

 toe, 14-14.5 (14.2). Nine females of Dieruropsis leucops measure: Wing, 

 154-167 (159.4) ; tail, 131-150 (138.6) ; culmen, 29-35.5 (32.6) ; tarsus, 24r-26 

 (24.8) ; middle toe, 17-19 (18.2). From the above it will be seen how greatly 

 the two above species differ in size ; differences that can not be explained in 

 any other way than that the smaller bird is specifically distinct. 



To the original description there is one correction to be made, 

 the locality given on the label, Besoa, proves to be a district ; in Mr. 

 Raven's field catalogue the precise locality is given as Toewo 

 Mountain. 



All the above localities are in the mountains, in the general 

 region of Lake Lindoe. 



This is one of Raven's most interesting discoveries and I am not 

 realy sure that it belongs in the same genus with Dieruropsis leucops^ 

 as the rictal bristles are longer, the bill and feet weaker, and the 

 tail structurally different, but there seems no other place for it and 

 it has been clearly derived from the lowland species. 



Family CORVIDAE. 



CHOWS. 

 201, NESOCORAX TYPICA (Bonaparte). 



A pair from Toewo Mountain, Besoa, October 26 and 30, 1917; 

 and another pair from Pinedapa, January 14, 1918. 



The above specimens were taken considerably north of any 

 hitherto reported locality. They measure as follows: 



These birds are all similar and differ somewhat from Meyer and 

 Wiglesworth's ^^ description. The black of the throat is not sharply 



»» Birds of Celebes, vol. 2, lfe?8, p. 584. 



