1901.] 



PTERYLOSIS OF THE GIANT HUMMING-BIRD. 



315 



pterylosis and that of Patagona. The converging lines of feathers 

 that run backwards over the crown, the crescentic row of feathers 

 over the eye, and the crescentic apteria, internal and external to 

 this latter row, are features that the Swift possesses in common 

 with the Humming-bird. But, on the other hand, the absence of 

 the median frontal and occipital apteria, of the eyelashes of the 

 upper lid, and in general the uniform feathering of the back of 

 the head, all these are striking differences. 



Text-fig. 79. 



Pterylosis of Collocalia s.fodio'pyga. 

 A, dorsal view ; B, ventral view of wing. 



In Caprimulgxis macrurus (text-fig. 80, p. 316) the arrangement 

 of the feathers on the head is as follows : — A double row of feathers 

 starts on the dorsal side of each nostril and curves inwards to 

 approximate to its fellow on a level with the anterior border of 

 the eye, leaving a lanceolate space vacant between, much as in 

 the Humming-bird. A few median feathers intervene between the 

 two rows (each of which has become uniserial) on the top of the 

 head, and behind these the two rows first fuse in the middle line, 

 then diverge slightly (behind the level of the eye), and each after- 

 wards bifurcates prior to running dow n over the occiput and nape. 

 Two other rows immediately external to these on each side run 



