( 4.W ) 



h*. l{mi]]i grey, like the back, rarely wliitisli, midor parts never 

 1 landed in the fully adult.* 

 ((\ White tips to the secondary (|uills narrower, about U'2') 

 in. wide ; black not extending,' beyond the ear-coverts. 

 «'. No black band at base of culnien. 



a'. Back light grey, under iiarts white.* 

 //. Back dark grey, under iiarts rosy, 

 c'. Back dark grey, under jiarts grey. 

 /A Black band at base of cuhuen narrow, about O'l in. 

 wide. 

 (V. Size very large, wing .'>■.') in., tail fi. 

 (•'. Size moderate, wing and tail less than 4'."i in. 

 a'. Two outer pairs of tail-feathers jiure white 



with dark shafts. 

 h". Outer pair of tail-feathers white, generally 

 black along the basal part of the shaft, fifth 

 pair partially black on the inner web. 

 «°. White on ba.sal half of primary iiuills e<s- 

 tending for aliout 1 in. beyond the tips 

 of the black primary coverts. Wing more 

 than 4 in. long, 

 a'". Inner web of secondary quills mostly 

 white, outer pair of tail-feathers 

 white. 

 li"'. Inner web of secondary quills mostly 

 dusky, outer pair of tail-feathers 

 black along the ba.sal ]iart of theshaft. 

 /)'. White on basal half of primary (|uills e.x- 

 tending for about half an inch beyond 

 the tips of the black primary covert.s. 

 Wing less than 4 in. long. 

 c'°. Bill larger, culmen measured from an- 

 terior wall of nasal o)iening to tij) 

 0-6— 0-68 in. 

 (V. Bill smaller, culmen measured from 

 anterior wall of na.sal ojiening to tip 

 O'.") in. 



(?. Outer pair of tail-feathers with the basal half 

 of the inner web black. 

 6°. White tijis to the .secondary quills nearly half an inch 

 (O'.'i) wide and extending down the marginal half of 

 the outer web, black liand across the base of the 

 cuhnen narrow (ca. 0'L"> in. wide) but well-defined ; 

 black on ear-coverts continued in a wide band down 

 the side of the neck. 

 Outer secondary quills with basal (lart of both webs white, the 

 black jiart of the feathers being in some cases reduced to 

 a band along the terminal half of the outer web next to 

 the shaft, 

 c*. Outer jiair of tail-feathers with .some black on the basal 

 .half of the inner web, fifth imir with a large patch of 

 the same colour. 

 '/'. Outer]iairof tail-feathorswhite, fifth pair aliTiost or entirely 

 white, 

 c'. Size larger, wing 47 in. ; feathers at base of culmen 

 white. 

 f". Rump white, contrasting strongly with the back, 

 two outer pairs of tail-feathers white or almost 

 white. 



• Occasionally the frmair nf L. major rctain.s faint bands on the breast. 



vu^-idionnJis ij ? 

 ulr/ei-iensis cJ ? 



ilifjantem (J V 

 detdhatus cJ ? 



(tssimilis (J ? 

 pidlidirostris ^ ? 



uncinatun ^ J 



ludovicinnus 

 (very old birds) 



liulocicUmns (^ ? 



lahlora J ? 



excubitor <J ? 



