TEREGRINE FALCON. 297 



quill ; the secondary quills lighter, their outer webs obscurely 

 barred with dark grey, the inner barred like those of the pri- 

 maries. The tail is greyish-blue, the middle feathers with 

 eleven, the lateral with thirteen bars of greyish -black, those to- 

 ward the base narrower and more grey, the last much larger, 

 the tips white. The throat and sides of the neck are white, 

 without markings ; the general colour of the rest of the lower 

 parts is white, on the sides of the body and outer part of the 

 tibite tinged with grey ; the fore-neck with very slender cen- 

 tral streaks on the feathers ; those on the breast at first lan- 

 ceolate, then roundish, and lastly transverse ; the sides and 

 tibiae distinctly barred with greyish-black ; the bars on the 

 sides of the rump, the lower tail-coverts, and abdomen fainter ; 

 the lower wing-coverts white, with dark bars. 



Length to end of tail I65 inches, to end of wings 16; ex- 

 tent of wings 365 ; wing from flexure 12^ ; tail 6^ ; bill along 

 the ridge 1 ^V, along the edge of lower mandible 1^% ; tarsus 

 lj% ; hind toe 1|§, its claw 1^'^ ; second toe lj%, its claw i"| ; 

 third toe 2, its claw j% ; fourth toe 1^, its claw j%. 



Female. — The female, which is much larger, is easily dis- 

 tinguished by the tints of the plumage, which is reddish on 

 the lower, and less blue on the upper parts. The proportions 

 are similar ; the diameter of the nasal aperture two-twelfths, 

 of the eye five and a half twelfths, of the ear four-twelfths. 

 The oesophagus is seven inches long, an inch and a quarter in 

 width at the top, two inches and a half in the dilated part ; 

 the stomach two inches and three-fourths in diameter ; the 

 intestine forty-nine inches in length, its width in the duodenal 

 part three-eighths, toward the end two-twelfths ; the coeca a 

 twelfth and a half in length ; the cloacal dilatation of the rec- 

 tum an inch and a half in width. The first quill is four- 

 twelfths shorter than the second, which exceeds the third by 

 half an inch. 



The bill is greenish-yellow at the base, then pale blue, with 

 the tip black ; the cere and eyelids yellow ; the iris dark hazel ; 

 the feet greenish-yellow, the claws bluish-black. The general 

 colour of the upper parts is deep grey, of the head greyish- 



