468 SYSTEMATIC SYNOPSIS. —PICARLA — CUCULIFORMES. 
24. Family TROGONIDZ: Trogons, 
Feet zygodactyle by reversion of the second toe (see p. 127). The 
base of the short, broad, dentate bill is hidden by appressed antrorse 
feathers; the wings are short and rounded, with falcate quills ;' the 
tail is long, of twelve broad feathers; the feet are very small and 
weak. The general plumage is soft and lax, the skin tender, the 
eyelids lashed. A well-marked family of about 50 species and 
perhaps a dozen genera, chiefly inhabiting tropical America. They 
Fic. 318, —Head of Cop. 2%€ of gorgeous colors, and among them are found the most magni- 
per-tailed Trogon, nat. size. ficent birds of this continent (fig. 317). 
144. TROGON. (Gr. rpéyar, trogon, a gnawer : alluding to the dentate bill.) The leading genus, 
to which the above characters fully apply. 
422. T. ambi'guus. (Lat. ambiguus, ambiguous, as doubtfully distinct from T. mexicanus. Fig. 318.) 
COPpPER-TAILED TRoGoN. Metallic golden-green; face and sides of head black; below from 
the breast carmine; a white collar on the throat ; middle tail-feathers coppery-green, the outer 
white, finely variegated with black ; quills edged with white. Length about 11.00; wing 5.25; 
tail 6.75. Valley of the Lower Rio Grande, and southward. 
[Family MOMOTIDA: Sawhbills. 
Feet syndactyle by cohesion of third 
and fourth toes (p. 129); tomia serrate. 
A very small family of tropical American 
birds, comprising about 15 species, none 
having really rightful place here; but 
~ the Momotus ceruleiceps (fig. 319) comes 
near our border, and is included to illus- 
trate the suborder. In this species, the 
central tail-feathers are long-exserted, 
and spatulate by absence of webs along 
a part of the shaft—a mutilation effected, 
it is said, by the birds themselves; the 
Fie. 319, — Head of Blue-headed Saw-bill, nat. size. bill is about as long as the head, gently 
curved; the nostrils are rounded, basal, exposed; the wings are short and rounded ; the tarsi 
are scutellate anteriorly. It is greenish, with blue head. Mexico. ] 
25. Family ALCEDINIDA: Kingfishers. 
Feet syndactyle by cohesion of third and fourth toes (p. 129, fig. 44); tomia simple. Billlong, 
large, straight, acute (rarely hooked) ; somewhat “ fissirostral,” the gape being deep and wide. 
Tongue rudimentary or very small. Nostrils basal, reached by the frontal feathers. Feet very 
small and weak, scarcely or not ambulatorial ; tibiee naked below; tarsi extremely short, reticu- 
late in front; hallux short, flattened underneath, its sole more or less continuous with the sole 
of the inner toe; soles of outer and middle toe in common for at least half their length ; inner 
toe always short, in one genus rudimentary, in another wanting (an abnormal modification). 
Developed toes always with the normal ratio of phalanges (2, 3, 4,5; p. 127); middle claw not 
serrate. Wings long, of 10 primaries. Tail of 12 rectrices, variable in shape. 
“The Kingfishers form a very natural family of the great Picarian order, and are alike 
temarkable for their brilliant coloration and for the variety of curious and aberrant forms which 
