194 BLACK-THROATED DIVER- 



centre of the webs yellowish olive. The accom- 

 panying wood-cut will shew the form of these regular 



spots in the Black-throated (No. 1) and Great North- 

 ern Divers (No. 2). A specimen killed in winter (in 

 the plumage of the Lesser Imber) has the tint of the 



