CHAPTER X. 



THE GENERA. 



T N this list the families and sub-families are arranged alphabetically 

 -*- so as to facilitate reference ; and only such particulars are given 

 as are needed to distinguish one genus from another as regards its 

 representatives in the British List. For the separation of the families 

 reference must be made to the preceding chapters, the separation of 

 the species being given in the chapter that follows. 



ACCENTORIN^. (Plate iv.) 

 Accentor — 45, 46. 



Alaudin^. (Plate x.) 

 Alauda — third primary longest ; breast spotted ; tarsus longer 



than middle toe. 132-136. 

 Otocorys — second primary longest ; breast black ; tarsus not 

 longer than middle toe. 137. 



Alcedinid^. (Plate xi.) 



^tert'o— without a crest ; tail short. 151. 

 Ceryle — with a crest ; tail long. 152. 



Alcid^. (Plate xxxii.) 



1. Bill unfeathered at base. 



Fratercula — bill sheathed with orange. 379. 



2. Bill feathered at base. 



Alca — bill large and compressed ; remiges 30. 373, 374. 

 Mergulus — bill broader than high ; remiges 26. 378. 

 Uria — bill strong, straight and pointed. 376, 377. 



Ampelin^. (Plate vi.) 

 Ampelis — long erectile crest. 77. 



Anatid.^. (Plates xix. xx. xxi. xxii.) 



Cygiius — lores naked ; neck long ; legs short. 227-332. • 

 Mergus — bill narrow, with sharp teeth. 259-262. 

 Somateria — bill with a central tract of feathers. 253-255, 

 Spatula— \y\A spatulate and long. 237. 



1. Lobe of hind toe absent or rudimentary. 



2. Lobe of hind toe well developed. 



Lobe of hind toe absent or rudimentary. 

 Feet webs notched. 

 Dafila — tail pointed. 238. 

 Querquedula — tail rounded. 239-241. 

 Feet webs entire. 

 Tarsus reticulate all round. 

 Aiiser — bill nearly as long as head. 217-222. 



