OF THE BBITISH ISLANDS. 403 



measure 011 an average 2'1 inches in length, by 1'65 inch in breadth. One brood 

 only appears to be reared in the season, but whether the male takes any share in 

 the duty, observers fail to inform us. Doubtless the female alone takes sole 

 charge of eggs and brood. The period of incubation, so far as I can ascertain, 

 has not been recorded. Hybrids between this species and Nyroca americana 

 have been recorded by Professor Newton (Proc. Zool. Soc., 1860, pi. clxvii.), and 

 by Leverte (Journ. Orn. 1890, p. '224). 



Diagnostic characters. Fuligula, with the speculum bluish-grey; 

 and in males in breeding dress with a varyingly distinct chestnut ring round the 

 neck. Length, 17 inches. 



