560 



Key to the Sub-Families. 



I. Feathering on the lores extending at least 



to the posterior border ot the nasal 



opening, ^vhieh is either expose^d or 



overhung and partially concealed hv 



dense velvety feathers which may extend . .., ^ 5^,0 



to the anterior margin • • • • • • 1- ^^(^^^^^^. P- ''''■ 



II Feathering on the lores not extending to 



the posterior border of the nasal opening, tFRCULIXE, ' 



^vhich is overhung by a homy scalo .... 2. FRATLhtULl.^.t., 



Subfamily I. ALCINiE. 

 Key to the Genera. 



I. Bill deep, greatly compressed and trans- 

 versely Irooved; the outhne of the 

 culmen strongly curved downward. 



A Tail composed of 14 feathers; inter- 



ramal feathering extending far beyond 



a vertical hne drawn from the anterior 



border of the nasal opening. Size 



verv large : total length about rfU 



very lai^ " ... 1. Plauti'S, p. 562. 



inches ; • : " ' ,' ■ I 



B Tail composed of 12 feathers ; mter- 



ramal feathering extending to _ a 



vertical line drawn from the anterior 



border of the nasal opening, bize 



„,oderate: total length about 18 _^ ^,^^504. 



inches "' ' '^ 



II Bill f^bort and stout, culmen rather 

 '^trono-lv curved downward ; inter- 

 ramaF feathering extending far beyond 

 a vertical line drawn from the anterior 

 border of the exposed nasal opening. 

 Tail composed of 12 feathers, bize 



small : total length about 8-5 inches . . 5. Alle, p. 569. 



III Bill elongate and moderately compressed ; 

 ' culmen more or less curved downward 



towards the tip ; inter-ramal feathering 

 extending to, or slightly beyond, a vertical 

 line drawn from the anterior border ot 

 the nasal opening. , , ,, ^, 



C Metatarsus distinctly shorter than the 

 middle toe and claw. 

 a Tail composed of 12 feathers; bmng 



of the wings pure white 4. Ukia (part), p. 5. 2. 



