152 



PROCEEDINGS OP THE ACADEMY OP 



cere. The cnlmen is nearly horizontal to just beyond this mark, 

 and then exhibits a gradual decurvature to the apex. The beak 

 is strongly compressed, and the tomia strongly decurved, forming 

 an open festoon, whose middle point marks one-fourth the length 

 of the beak from the uares. The latter are directed obliquely down- 

 wards and forwards, narrowing anteriorly, and having a prominent 

 inferior bounding ledge. The mandible is weak, the symphysis 

 marking on half the length of the beak, from the anterior angle of 

 the nares. 



The bones of the anterior extremities exhibit large and power- 

 ful proportions as compared with the posterior, appropriatel}' to 

 capacitj' for sustained flight. The head of the humerus is much 

 compressed, and the articular face is nearly divided into two by 

 the deep bicipital groove. The head of the femur is small, and 

 the rotular face, a wide and deep groove. The tibia is slender, 

 the shaft much compressed, with a prominent ridge. The cuemial 

 crest is short, and not produced downwards on the shaft. The 

 distal posterior bridge is narrow and oblique. The tarso-raetatai'- 

 sus has a strong exterior crest which constitutes half the width of 



the shaft. 



Measurements. Inch. 



Length of beak from base of CLilmeu ( q i ) ^-^^ 



