232 STRUCTURE AND CLASSIFICATION OF BIRDS 



In the typical Caprimulgidae (fig. 109) the claw of the 

 middle toe is serrated and the fourth toe has but four pha- 

 langes. There is no serration and five phalanges in others.' 

 The after shaft is present ; in the aberrant Steatomis it is 



Fig. 111. — PowDJSB-DOWN Patches of Podargus (AriEK Sclatie). 



not absent (as Gaeeod asserted) . Podargus is remarkable 

 for the possession oi powder-down patches, oi which there are 

 two, one on either side of the rump (see fig. Ill), first dis- 

 covered by Mr. Sclateb.^ The patches of this bird are well 

 defined and very compact, and have not the diffuse character 

 that is seen in, for example, Bhinochetus. Powdfer downs 

 are also found in Batrachostornus and Nyctibius'. The 



' SoLATEK, ' Notes upon the American Caprimulgidae,' P. Z. S. 1866, p. 120. 

 ^ ' Additional Notes on the Caprimulgidte,' ibid. p. 581. 



