.'58 



Mr. W. I\ Pycraft on the 



feathers, which may be said to meet below the jaw at this 

 point. 



The facial disc is formed by the feathers of the loral and 

 post-aural section of the circum-aural area. 



Pt. colli dorsalis (text-fig. 3). — This is a densely feathered 

 tract not closely investing the neck, but throughout the 

 greater part of its length supported on a vertical fold of 

 skin. This fold serves to fill up the U-shaped curve formed 

 by the folding of the neck on the body in repose, whilst the 

 Heather-tract forms a bridge across the top of the loop. The 

 tract is widest at its confluence with the pteryla capitis, and 

 passes insensibly backwards into the pt. spinalis. 



Pt. spinalis (text-fig. 3). — It is not possible to draw a hard- 



Text-fij?. 3. 



/./ <<:•// nVrs. 



Dorsal aspect of Photodilus badius, showing the arrangement 

 of the pteryhe. 



par. =parapter on. 



pf.ca.ud. = pteryla caudalis. 

 j)t.cull.dors. = Y>tvryhi colli dorsalis. 



pt.cr.= pteryla cruralis. 



pt..sp.= „ spinalis. 

 pt.hum.= „ hutneralis. 



and-fast line between the upper end of this tract and the 

 pt. colli dorsalis. The interscapular and lumbar forks are 



