Vol. XXIII 



i906 J (-'lark, Pterylosis of Swifts and Hummingbirds. 



83 



Coeligena. 



In this genus the head is more sparsely feathered than in Pata- 

 gona, with the lines of feathers very clear, the occipital apterium 

 is very distinct, the frontal apterium is very long, and the humeral 

 tract is clearly connected with the dorsal. The secondaries are 

 6 or 7, the wing is aquincubital, and the formula for the rectrices 

 is 4-3-2-5-1. 



Specimens examined. 



Trochilus. 



(Plate III, Figs. 1-3.) 



The pterylosis of this genus is clearly shown in the figures given, 

 and is an excellent example of the trochiline condition. The feet 

 are feathered to the tarsal joint. There are 6 secondaries and 

 the wing is aquincubital. 



Specimens examined. 



Calypte. 



The pterylosis of this genus shows no peculiarities whatever, 

 nor is there anything noteworthy in the details, concerning the 

 primaries, secondaries, alula and rectrices. 



