° i906 J Clark, Pterylosis of Swifts and Hummingbirds. 

 Specimen examined. 



75 



No. 



Name. 



Locality. 



Collection. 



Condition. 



1 \H emiprocne zonaris (Linn.) Jamaica 



U.S.Nat.Mus. 



Alcoholic; very good 



Nitzsch refers to the "lange, kriiftige, dichtfiedrige" femorals, 

 and to the width of the branches of the dorsal tract, "ziemlich 

 breit" in collaris, "zweireihig fiedrig" or "einreihig" posteriorly 

 in acuta. In both, he says, he found "sechszehn Schwingen," 

 which is probably a mistake. 



Cypseloides. 



(Plate II, Figs. 4-5.) 



The general pterylosis of this genus is not essentially different 

 from that of Chwtura, but the tracts are wider and more thickly 

 feathered. The legs are feathered to the tarsal joint. The skin 

 on the hand and forearm, and even on the upper arm, is very dark. 

 There are 10 rectrices, 10 primaries, and 10 secondaries, and the 

 wing is aquincubital. The alula consists of 3 feathers and a little 

 claw. 



Specimen examined. 



In this genus, the nuchal apterium is small, but otherwise the 

 pterylosis is remarkably like Chcetura. The legs are sparsely 

 feathered to the very base of the toes in front, but the tarsus is bare 

 behind. The skin on the hand is almost black, and the darkened 

 color extends nearly to the shoulder. There are 8 rectrices and 



