196 BUTEO LAGOPUS. 



an inch long, fleshy, concave above, rounded ; the oesophagus 

 six and a half inches long, expanded into a crop two inches 

 and eight twelfths in width ; the stomach roundish, somewhat 

 compressed, two inches and a quarter in diameter ; its muscu- 

 lar coat thin ; the pylorus with three knobs ; the intestine 

 three feet seven inches in length, from five twelfths to a 

 twelfth and a half in width ; the rectum four inches long, five 

 and a half twelfths wide ; the cloaca globular ; the coeca three 

 twelfths long. 



Length to end of tail 21 inches ; extent of wings 51 ; wing 

 from flexure 17 ; tail 9i ; bill along the ridge 1^^ ; along the 

 edge of lower mandible ly% ; tarsus 2.? ; hind toe /|, its claw 

 1/2 ' second toe /I, its claw 1^^^; third toe l/g, its claw 

 \^ ; fourth toe |§, its claw j%. 



Female. — The female, which is much larger, resembles the 

 male in colour ; an adult individual in my collection differing 

 only in having the light-coloured parts more tinged with yel- 

 low, the small wing-coverts more largely edged with brownish- 

 red, the scapulars and larger wing-coverts broadly margined 

 with yellowish-white ; but as scarcely two adult individuals 

 agree in every particular, it is inexpedient to enter into a very 

 minute description. 



In an individual killed in Fifeshire in December 1839, the 

 oesophagus was seven inches long, the crop two inches and a 

 half in width ; the stomach two inches in diameter ; the in- 

 testine four feet one inch long ; the coeca three twelfths, and 

 the cloaca an inch and a quarter in diameter. 



Length to end of tail 23i inches ; extent of wings 56 ; wing 

 from flexure 18 ; tail 10 ; bill along the ridge 1^% ; tarsus 2j% ; 

 first toe |S, its claw 1^^^ ; second toe \%, its claw l^-^j ; third 

 toe I5, its claw {^ ; fourth toe Ij^^, its claw j|. 



Variations. — Although the individuals commonly met with 

 present a considerable diversity of colouring, I do not find that 

 the differences are of much importance, being confined to changes 

 in the relative extent of the white and brown markings, stronger 

 shades of yellow on the white, and the presence or absence of red- 



