i9i8.] 



Under Wing-Coverts of Birds. 



535 



cases, of those nearest the elbow-joint. This exception was 

 noted only in two or three of the last specimens examined ; 

 but I think it may have escaped notice in the others, since 



Text-figure 5. 



Diagram of the feather-arrangement of the underside of the wing ol 

 Pteronetta liartlaubi. 



i-x. Primaries, 

 i'-iv', etc. Secondaries. 

 l*-ll^ Manual major upper wing-coverts. 

 l''-16''. Cubital major u.w.c. 



l^-G". Manual median u.w.c. 

 l''-16'*. Cubital median u.w.c. 



a. Additional carpal median covert. 



Text-figure 6. 



V /f 



n ™ I' " '^"^ , 

 I ff , Is- '/ 



'^^ L '' I I * ' 



^ 17' 



7° '3' / 



// 



1/ 



Diagram of the wing of Pteronetta hartlauhi showing the position of the 

 extra median covert marked (*) ; other lettering as before. 



at first I was accustomed to attribute any exceptional over- 

 lap to disarrangement. That the exceptional conforming 



