436 GTPSELID^. 



tSynopsis of the Subfamilies. 



a. Tarsi distinctly feathered ; outer and 



middle toes with only three phalanges. I. CYPSELINJE, p. iS6. 

 arsi unfeathered or with some 

 scanty feathers ; outer and middle 

 toes with the normal number of 

 phalanges. 

 a'. Tarsi quite as long as or longer than 



middle toes ; tail short and even 



or only slightly furcate ; wings 



always reaching far heyond the 



end oi tail II. CHjETURINAi, p. 470. 



b'. Tarsi perceptibly shorter than 



middle toes ; tail long and deeply 



furcate : wings not, or only [p. 511. 



just, reaching to the end of tail.'. III. MACROPTERYGINjE, 



Subfamily 1. CYPSELIN^. 



Synopsis of the Genera. 



a. Toes all directed forward at equal intervals 



from each other ; generally larger birds 

 with very strong feet. 



a'. Toes unfeathered 1. Micropus, p. 436. 



b'. Toes feathered. 



a". Tail only emarginate, outer rectrices 



not sharply pointed ; feathers of the 



breast round and fuU 2. Aebonautes, p. 459. 



b". Tail very deeply forked, outer rectrices 



very sharply pointed ; feathers of the 



breast loose, whole plumage soft and 



silky .... ;J. Panyptila, p. 401. 



b. Toes in pairs, the outer and middle toe di- 



rected to the right, the inner and hind toe 



to the left ; generally smaller birds, with 



only moderately strong feet. 



c'. Toes unfeathered 4. Tachornis, p. 462. 



d.' Toes feathered 6. Claudia, p. 469. 





a. Foot of Aeronautes inelMwleucus, to show the feathered toes. 

 h. Foot of Microptcs apus, | ^^ ^^^^ ^^^ j^j^^ ^f ^^^ ^^^3^ 

 c. l<ootor lacnornis parva, ] ^ 



