Vol. xxxiii.] 102 



Golden-Eye and came across the following characteristics 

 which, in the series available, seemed to be constant : — 



" 1. Depth of bill measured from the apex of the frontal 

 process of the upper mandible to the edge of the upper 

 mandible in a horizontal line : 



C. clawgula, J 20-2] *75 mm. (10 specimens) 



„ „ $ 17-18 mm. (6 „ ) 



„ islandica, S 23-24'5 mm. (9 „ ) 



$ 18-5-20 mm. (6 „ ) 



" Although the difference is small the measurement is not 

 one in which there is apparently much individual variation. 



" 2. The nail in C. islandica is always much broader 

 than in C. clangula, about 5 mm. as compared with 3 mm. 



"The length of bill is no guide, but the wing of C. islan- 

 dica is, on the average, longer than that of C. clangula. 

 The knob on the forehead referred to by Mr. F. Menteith 

 Ogilvie in Bull. B. O. C. xxxi. p. 19, I find is not a constant 

 difference between the two forms in either sex. ' 



"The bill in the female of Barrow's Golden-Eye has rather 

 a stouter and more ' stumpy ' appearance as a rule than that 

 of C. clangula, and the ridge on the upper mandible is more 

 pronounced/' 



Mr. Ogilvie-Grant exhibited five female examples of 

 Barrow's Golden-Eye and two of the Common Golden-Eye, 

 and pointed out that in examples of the former from Iceland, 

 the yellow marking on the upper mandible appeared to be 

 always larger and extended up to and below the nostril, 

 whereas in C. clangula it formed a narrow subapical band 

 which did not reach the nostril, and the area below it was 

 always black. In one American example of Barrow's 

 Golden-Eye both the upper and under mandibles, with 

 the exception of the nail, were entirely yellow ; a second 

 American specimen was very similar, showing only a trace 

 of dusky markings towards the base of the culmen (cf. 

 Brewster, Auk, xxvi. pp. 157-8). No example from Ice- 

 land which Mr. Grant had examined possessed an entirely 

 yellow bill. The female Barrow's Golden-Eye might also be 

 distinguished from the female of the Common Golden-Eye 



