95° 



TECTRICES 



consisting of only one row of feathers, which in the case of the 

 Greater agrees in number with that of the Remiges, each tectrix 

 being placed on the proximal side of its corresponding remex. 

 When the 11th or terminal quill is absent its Upper covert remains 

 as a siipernumerary, as for instance the well-known stiff "painter's 

 feather " of the "Woodcock. The Lower 1 1th tectrix is less constant, 

 and in the GalUnx, for example, is absent. Similar conditions are 

 found in the 10th Greater covert of many Passeres, and sometimes 





Falco. 



TUBDUS. 



Trochilus. 



%' 





w>\ 



H^K 



, t < ' ^ -^\ ^>" ^-^^--^->^vC^CN>- 



-^l 



^\^vy 



J 



.V> 



Sterna. * Plotus. 



C, suppleiin'utary ; I), posterior row of Middle Upper wing coverts ; x shews the point of 

 change in the overlap. (After Goodehild.) 

 (From tlie Proceedinys of the Zoological Society, 1SS6.) 



the terminal Upper covert is even larger than the corresponding 

 quill. The Upper covert of the first or proximal digital (" primary ") 

 quill is often very small or even absent, being completely overlaid 

 or represented by the coiTCsponding Middle covert, an arrangement 

 probably produced by the mechanical conditions necessary to the 

 folding of the Aving. The Upper Greater coverts of the cubital 

 (" secondary ") quills likewise grow from the proximal side of their 

 remiges, but they cross the latter in an outward direction. The 

 Lower tectrices are also inserted proximally, but those of the Greater 

 series do not cross their remiges, though they are crossed inwards 



