16. CIRCUS. 51 



c. Thiffhs white, with rufous streaka or spots. 



a'. Throat and chest ashy ffrey }n/ffargm cJ, p. 64. 



b'. Throat and breast streaked with browu. 

 a". Under wing-coverts and central tail- 

 feathers uniform gmddi ad., p. 72. 



b". Under wing-coverts fulvous, more or 

 less streaked or spotted with brown ; 

 tail-feathers banded. 

 a". Fifth primary escalloped on outer 

 web. 

 n"". Tarsus 3*5 inches in length .... hudsonius § ad., p. 5.5. 



b"". Tai-sus 3-1-3-15 inches j ^/^'^''"''^w. $ ad., p. r.8. 



j cyaneus 5 ad., p. o2. 



c"". Tarsus 4 inches gouldi 5 fid., p. 72. 



b'". Outer margin of fifth primary entire. 



cl'". Notch in second primary an inch 



or more distant from tip of 



coverts pygargiis 5 ad., p. 64. 



e"". Notch in second primary nearly or 



quite hidden by coverts macrurus 5 ad., p. 67. 



cl. Thighs rufous, generally uniform or spotted 

 or margined with white, 



n'. Tail uniform grey eeriiginosus cJ $ ad., 



b'. Tail distinctly banded. p. 69. 



a". Under wing-coverts white, mesially 

 streaked with pale rufous ; breast 

 light brown, vrith white margins, 



producing a streaked appearance .. ranivorm (} $ ad., p. 71. 

 b". Under wing-coverts and breast rufous, 

 numerously spotted with white, 

 giving a somewhat barred appear- 

 ance assimilis S $ ad., p. 6.3. 



c". Under wing-coverts black, spotted with 

 white ; breast black, streaked with 



white : macidosus J , p. 62. 



e. Thighs black. 

 c'. Tail banded. 



a". Upper tail-coverts white maurus, p. 60. 



b". Upper tail-coverts black pi/gargus, var., p. 64. 



d'. Tail uniform grey eeruguwsiis, var., p. 69. 



Young : — 



a. Outer web of fifth primary notched. 



a'. Chest perfectly uniform, with no sti'eaks. 

 a". Chin or throat and centre of breast 

 creamy buff. 

 «'". Inner web of primaries uniform .... (erttginosus, p. 69. 

 b'". Inner web of primaries barred or 



mottled with brown ranivorus, p. 71. 



b". Chin and throat uniform with breast 



and back govMi, p. 72. 



h'. Chest light or dark, but always distinctly 

 streaked, 

 r". Outer tail-feather uniform below, 

 c'". Head whitish, with narrow black 



streaks a>ruginostis, p. 69. 



F 2 



