232 STRUCTUEE AND CLASSIFICATION OF BIRDS 



In the typical Caprimulgidse (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. 1 

 The aftershaft is present ; in the aberrant Steatornis it is 



FIG. 111. POWDER-DOWN PATCHES OF Podargns (AFTER SCLATER). 



not absent (as GAEEOD asserted). Podargns is remarkable 

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

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

 covered by Mr. SCLATER. 2 The patches of this bird are well 

 defined and very compact, and have not the diffuse character 

 that is seen in, for example, RhinocJietns. Pow T der downs 

 .are also found in Batrachostomus and Nyctibius. The 



1 SCLATER, 'Notes upon the American Caprimulgidse,' P. Z. S. 1806, p. 1'Jd. 



2 ' Additional Notes on the Caprimulgidae,' ibid. p. 581. 



