Vol. XXIII 



xxnn 

 1906 Clark, Pterylosis oj Swifts and Hummingbirds. 



85 



Specimens examined. 



Orthorhynchus. 



There is nothing specially noteworthy with reference to this 

 genus, for even in details it agrees with Trochilus. Of the 10 

 rectrices, the first is longest, the fifth shortest. 



Specimens examined. 



Stephanoxys. 



The long plume on the head is located in the group of feathers 

 between the frontal and occipital apteria and its "pit" is very 

 conspicuous in the plucked bird. There is nothing specially 

 peculiar in the general pterylosis, but one wing is apparently 

 quincubital. The tail formula is 2-1-3-4-5. The feet are feath- 

 ered just over the tarsal joint, and the skin on the hand along the 

 upper anterior edge, and even on the forearm is very dark. 



Specimen exam in ed. 



