SUB-OKDER 



OSCINES. 



Singing Birds. 



Ch. — ^Toes, three anterior, one behind ; all at the same level, and none rersatile, the outer anterior never entirely free to 

 the base. Tail feathers, twelve. Primaries, either nine only, or else the first is spurious or much shorter than the second, making 

 the tenth. Tail feathers usually twelve. Tarsi feathered to the knee ; the plates on the anterior face either fused into one, or with 

 distinct divisions ; the posterior portion of the sides covered by one continuous plate on either side, meeting in a sharp edge behind, 

 or with only a few divisions inferiorly. Occasionally the hinder side has transverse plates, corresponding in number to the 

 anterior, but there are then usually none on the sides. Larynx provided with a peculiar muscular apparatus for singing, 

 composed of five pairs of muscles. 



The preceding diagnosis, mainly derived from Dr. Cabanis, expresses the chief characteristics 

 of such land birds as are provided with a peculiar apparatus for producing song. Birds of other 

 orders may have more or less agreeable notes, but it is among the Oscines that we find the 

 delightful and varied melody we are accustomed to consider as the "singing" of birds. It is, 

 indeed, seldom, as Cabanis justly remarks, that so great a change has been produced in the sys- 

 tematic arrangement of a class by the discovery of a single fact, as has been the case in orni- 

 thology since the announcement that some l)irds have a peculiar muscular vocal apparatus, 

 denied to others. It is to Cabanis himself, however, that is chiefly due the merit of having been 

 among the first to discover appreciable external characters corresponding to these anatomical 

 peculiarities, and of defining the boundaries of the families as rearranged. 



The most natural arrangement of the Oscines, or singing birds, is a matter of much uncer- 

 tainty, and can only be settled by the careful examination, external and internal, of a great 

 number of types. As the birds of North America lack representatives of many sub-families, 

 and even of families, I have done little more than to follow Dr. Cabanis in his Ornithologische 

 Notizen,' and Museum Heineanum, making here and there a slight transposition where it seemed 

 necessary. The characters of some of the families, and of nearly all the sub-families, I have 

 been obliged to work out for myself, owing to the very meagre indications given by the above 

 mentioned author. 



According to Cabanis, the fusion of all the scutellae of the tarsus into one continuous envelope 

 without indications of division, (called "boot" by the German ornithologists,) is to be con- 

 sidered as indicating the highest type of ornithological structure, and the position of the different 

 families and genera in the scale, to be mainly regulated by their approach to this character, 

 "With this, however, are to be combined the hints afforded by the greater or less development of 

 the first primary, the elevation in rank being also, to a considerable degree, proportional to the 

 tendency to a reduction of this quill in size, and to its gradual suppression entirely. 



The families of North American Oscines embrace a large proportion of those that have been 

 established ; but some have no representatives whatever, such as the typical Muscicapidae, the 

 Nectarinidae, the Melliphagidae, the Ploceidae, the Sturnidae, and the Faradiseidae. Many 

 sub-families are wanting, too, of families which have other representatives. 



' Wiegmann's Archiv fiir Naturgeschichte 1847, i, 18C, 308. 



