98 GENERAL ORNITHOLOGY. 



skull. This is called the " angle of the jaw ; " it is a good landmark, which must by no means 

 be confused with the " angle of the mcjuth," where the horny parts of the beak come together. 

 The lore (Lat. hrum, a strap, or bridle ; hence, place where the cheek-strap passes ; fig. 25, 2) 

 includes pretty much all the space between the eye and the side of the base of the upper 

 mandible; a considerable part of it is simply ante-orbital. Thus we say of a hawk, "lores 

 bristly ; " and examination of a bird of that kind will show how large a space is covered by the 

 term. Lore, however, should jiinjierly be restricted to a narrow line between the eye and bill 

 in the direction of the nostrils. It is excellently shown in the heron and grebe families, where 

 "naked lores" is a distinctive character. The lore is an important place, not only fi-om being 

 thus marked in mauy birds, but fi-om being frequently the seat of specially modified or specially 

 colored feathers. The rest of the side of the head, including the space between angle of jaw 

 and biU, has the name of cheek (Lat. geuci, first eyelid, then, and generally, the prominence 

 under the eye formed by the cheek-bones; fig. 2,5, 36). It is bounded above by loral, infra- 

 orbital, and auricular regions ; below, by a mtire or less straight line, representing the lower 

 edge (if the bony prong of the under mandible. It is cleft in front for a varying distance by the 

 backward extension of the gape of the mouth ; abuve this gape is nn.ire ]irnperly ge)m, or malar 

 region (Lat. mala, upper jaw) in strictness ; below it Is jaw (ma.viUa), or rather " side of the 

 jaw." The lower edge of the jaw definitely separates the side of the head fi-om the " under 

 surface " of the head ; properly bounded behind by an imaginary fine drawn straight across from 

 one angle of the jaw to the other, and running fonvard to a point between the forks of the 

 under inaudible. As already hinted, "throat" (gula ; fig. 25, 37) extends upward and forward 

 into this space without obvious dividing line ; it runs into chin (Lat. mentum ; fig. 25, 38), of 

 which it is only to be said, that it is the (varying in extent) anterior part of the under surface 

 of the head. Anteriorly, it may be conveniently marked off, opposite the point where the 

 feathers end on the side of the lower jaw, from the feathery space (when any) between the 

 branches of the upper mandible itself; this latter is called the interratnal space (Lat. inter, 

 between, ramus, fork). 



Tlie head is so often marked lengthwise with dift'erent colors, apt to take such defiuite 

 position, that these lines have received special names. Median vertical line is one along the 

 middle of pileuui, from base of liill to nuclia ; lateral vertical lines bound it on either side. 

 Suprciliary line has already been noticed ; below it runs the lateral stripe ; that part, of it 

 before the eye, is loral or ante-orbital ; behind the ej-e, post-orbital ; when these are continu- 

 ous through tlie eye, they form a trans-ocular (Lat. trans, across; ociiliis, eye) line; below 

 this is malar line, or cheek-stripe (Lat. frenum, a bridle) ; below this, on the under jaw, max- 

 illary or siibmaxillarij line ; in tin' middle below, mental or gidar lines. 



No part of the b(jdy has so variable a ptilosis as the head. In the great majority of birds 

 it is whoUy and densely feathered ; it ranges from this to wholly naked : but nakedness, it 

 should be observed, means only absence of perfect feathers, for most birds with imfeathered 

 heads have a hair-like growth of filoplumes on the skin. Our samples of naked -headed birds 

 are tlie turkey, the vultures, the cranes, and some of the heron tribe, as ibises. Associated with 

 more or less complete " baldness," is the frequent presence of various fleshy outgrowths, as 

 combs, wattles, caruncles (warty excrescences), lobes, and flajjs of all sorts, even to enumerate 

 which would exceed our limits. The parts of the barn-yard cock exemplify the whole ; among 

 North American birds they are very rare, being eoulincd, in evident development at any rate, 

 to the wild turkey. Sometimes hormj plates take the place of feathers on part of the head ; as 

 the frontal shields of the coots and gallinnles. A very common form of head-nakedness marks 

 <rae whole order of birds, the Steganopodes, which have mentum and more or less of gula 

 naked, and transformed into a sort of pouch, extremely developed in the pelicans, and well seen 

 in the cormorants. The next commonest is definite bareness of the lores, as in all herons 

 and grebes ; in the former including the whole circum-orbital region. A little orbital space is 



