OF NEW ENGLAND. 27 



CHAPTER I. 



FIRST ORDER. Passeres. 



These birds "are the typical Insessores, as such representing 

 the highest grade of development, and the most complex or- 

 ganization, of the class. Their high physical irritability is 

 coordinate with the rapidity of their respiration and circula- 

 tion ; they consume the most oxygen, and live the fastest, of 

 all birds." ^ All our forms, at least, are characterized as fol- 

 lows : bill without a cere, or a soft basal membrane ; front-toes 

 never only two, or united throughout {i. e. two of them), hind 

 toe never wanting ; tail-feathers twelve. This group may be 

 characterized, as a whole, as the only order of birds, of which 

 all the species invariably build a nest in which to lay their 

 eggs. Among the birds breeding in Massachusetts there is no 

 exception to this rule, except the parasitic Cow-bird. 



" Passeres, corresponding to the Insessores proper of most 

 ornithologists, and comprising the great majority of birds, are 

 divisible into two grofips, commonly called suborders, mainly 

 according to the structure of the lower larynx. In one, this 

 organ is a complex muscular vocal apparatus ; in the other the 

 singing parts are less developed, rudimentary, or wanting. In 

 the first, likewise, the tarsus is normally covered on either side 

 with two entire horny plates, that meet behind in a sharp ridge ; 

 in the other, these plates are subdivided, or otherwise differ- 

 ently arranged. This latter is about the only external feature 

 that can be pointed out as of extensive applicability ; and even 

 this does not always hold good. For example, among our 

 birds, the larks {Alaudidoi) , held to be Oscine, and certainly 

 to be called songsters, have the tarsus perfectly scutellate be- 

 hind."! 



The Oscines, or singing Passeres, technically considered the 



1 Dr. Cones ; " Key to North American Birds." 



