C64 



DR. H. GADOW ON THE REMIGES OF BIRDS. [DcC. 18, 



Group D. — With only 9 functional primaries. The 9th quill always 

 partakes of the formation of the tip of the wing, and is fre- 

 quently the largest of all. The 10th quill is, as a rule, reduced 

 to a tiny feather, which is hidden between the 10th covert and 

 outer vane of the 9th quill. This hidden portion is always 

 assumed by the 10th quill, even when it is still tolerably well 

 developed, as in the Hirundinidae and in the Icteridse, i. e. 

 in birds in which it is stated to be absent by most ornitholo- 

 gists. The 11th upper covert is frequently present. 



To this group belong the so-called " Oscines novem-pennatse," 

 corresponding with the Tanagroid Passeres of Wallace, and 

 with the section Fringilliformes ot the Cat. Birds Brit. Mus. 



