G60 



DR. H. GADOW ON THE REMIGES OF BIROS. [DeC. 18, 



hidden by the outer vane of the 9th primary. This shifting explains 

 the conditions which are the rule amongst the birds of Group D. 

 The 11th primary undergoes a similar dislocation in a more marked 



degree. 



Group X. — With 10 long primaries. The lOth quill is, with few 

 exceptions (e. g. Hylactes), very little shortened, and partakes 

 of the formation of the tip of the wing. The 1 1th quill is 

 frequently present, although small and hidden. When it is 

 absent, at least its upper covert is present as a stiff and well- 

 developed little feather. 



To this group belong all the Passeres non-oscines. 



