78 
the orbit greenish yellow in the former, bright yellow in the 
latter. In one stage, legs, feet, cere, orbits, are all pale primrose 
yellow. ‘The corneous “portion of the bill varies at base from 
greenish horny to greyish blue and even blue, and at tip from 
dark horny blue to bluish black. 
Dimensions of adults. Length M, 15 to 16:5, F, 17°5 to 
19. Expanse M, 37 to 41, F, 42 to 45. Weight M, 14 to 18 oz., 
F, 24 to 260z. Wing M, 12 to 18, F, 13 to 15; 2nd primary 
longest. Primaries fall short of longest, M, Ist, 0°62; 3rd, 0°44, 
F, Ist, 0°75; 38rd 0°37 (about, these dimensions vary). Tail 
from vent M, 7 to 8, F, 8 to 9; longest tail feathers exceed 
shortest by M, 0:7 to 0°85, F, 0°75 to 0:95. Tarsus M, 1-7 to 1-9, 
F,1°75 to 2; (feathered in front for from 0°85 to 1) Foot, greatest 
length, M, 3°5 to 4, F, 425 to 4:5; greatest width, M, 
3°25 to 3°7, F, 3°75 to 4; mid toe M, 1°6 to1°75, F, 1:9 to 2; 
its claw, along curve M, 0-69 to 0°78 F, 0°8 to 1:05; hind toe M, 
0:69 to 0°72, F, 0°8 to 0-9; its claw, along curve M, 0°75 to 0:9, 
F, 0:9 to 1:1. Bill straight, from edge of cere, M, 0°85 to 0:98 F, 
1 to 1:1; along curve M, 1-1 to 1°19, F, 1:1 to 1°25; from gape 
M, 1 to 1-12, F, 1-15 to 1°37; width at gape, M, 1 to 1:12, F, 1-15 , 
to 1:22; height at margin of cere M, 0:4 to 0°5, F, 0°47 to 0°53; 
Length of cere M, 0°18 to 0°22, F, 0- 2 to 0-25. Distance by which 
the closed wings fall short of end of tail M, 1-1 to 1:2, F, 1:2 to 
1:3; Distance by which lower tail coverts fall short of tail M, 3 to 
3-4, F, 3:2 to 36. 
There ought to be no confounding the Peregrine and the 
Laggar after they have once been seen together, The Peregrine 
isa much heavier and stouter bir d, the bill is much stronger and 
stouter ; the cheek stripe of the Peregrine i is a huge broad patch, 
in the Laggar, at most, a line a quar ter of an inch wide. Then 
the sides, flanks, thigh coverts, and lower tail coverts of the Pere- 
erine exhibit in all, except in very old birds, regular transverse 
bars, and even in the oldest birds show traces of these. There 
is no barring in any age on any of these parts in the Laggar. 
The groundwork of the lining of the wing of the Peregrine is 
white, barred with brown, whereas the ground-work of the wing 
lining of the Laggar is dark wood brown, a good deal mottled 
or barred with white j in the old bird. The Peregrine, as a rule, 
has no white frontal band, no white superciliary stripe and no 
rufous crown, asin the Laggar. Moreover the Peregrine has the 
centre tail feathers barred, whereas the Laggar has no trace of 
this barring ; again the whole of the upper back, scapulars and 
upper surface of the wing in the Peregrine are at times some- 
what obscurely, but yet manifestly, barred, but there is no 
trace of such barring at any age in the Laggar. Lastly, how- 
