336 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I50 



hurried they often show an attractive mannerism in the air in which 

 open wings are raised to a 45° angle and then brought down to 

 body level, suggestive of the flight method of many of the larger 

 butterflies. 



As they move about they utter low clucking notes and then may 

 burst out in loud calls of car-r-r-rao car-r-r-rao, from which they 



Fig. 55. — Limpkin, carrao, Aramus guarauna gnarauna, northern subspecies, 

 heavily streaked with white. 



derive their usual common name among those few of the country 

 people that recognize them. To most they are not distinguished from 

 the ibises, or cocos. The loud call, often mingled with harsher 

 sounds, is given sometimes in flight, and also may be heard at night. 

 In the adult male limpkin the trachea, as it descends the neck, is 

 elongated, and below the center is folded in a tight double loop on 

 the right hand side. It then continues to enter the thorax, where it 

 divides in the usual matter in two bronchi. The loop is not found in 

 females, and I have found it absent also in males that I assumed to 



