[The Kfa-s J 

 95 



KEY No. 8.— CLASSIFICATION ACCORDING TO 

 PATTERN OF PRniARY* FEATHERS. 



/. FrimarieH uniform frithnvt a fmUprn — 



(Spot-bill) 

 (Marbled DTd^ (^^^i^^^t, or of limited migration.) 



//. Primaries with outer iveh of very dark colour and 

 inner web of a dusky colour ruith dark tip — 



All the True Ducks — Highly migratory and rapid 

 flying. 



III. Outer primaries as nz II above, hut inner prima- 

 ries of same vhite or pale colour as t^peculum but tipped 

 ivith du.sky — 



All the Diving Ducks. 



Exception. — The Tufted Duck, called by some a Scaup 

 Duck, which has inner primaries with outer web white 

 or much paler than the inner. 



* Note.— The '' Primaries "' are tlie first tenor eleven quill 

 of the wing. Counting from the tip inwards, the first very minute 

 and difficult to discover. Tliey arise from the finger-joiuts 

 {'jphalonges) and palm {inetacnrpus). 



The " Secondaries " may be taken to mean all the remaiuinc 

 quills of the wing. They are actually those springing from the 

 forearm radius and ulna). 



