BIRDS — PICIDAE. 
79 
Family PICIDAE. The Woodpeckers. 
The diagnosis already given of the Picidae will readily serve to distinguish the family among 
the Scansores, although some characteristic features may be properly dwelt upon in more detail. 
The wedge-shaped bill is pre-eminently calculated for cutting into bark or wood in search of 
food or the construction of a nesting place. The wings are long ; tbe primaries ten in number, 
the first very short ; the secondaries vary from 9 to 12. The tail feathers in the typical sub- 
families are excessively rigid and cuneate, especially the middle ones ; the outer one on each 
side is very short and soft, or without stiffened shaft. It lies concealed between the second (now 
outer) feather and the third. 
The tarsi are covered anteriorly with large plates, posteriorly with small ones, more or less 
reticulated or polygonal. The claws are high, strong, much curved and very sharp. The 
tongue is elongated and acute, with short spines or barbs on each side near the point, and 
capable of great protrusion. 
The Picidae embrace three distinct forms, which constitute as many sub-families, namely, 
the Picinae, the Yunginae, and the Picumninae. Of these the Yunginae have no representatives 
in America. The Picumninae have soft tail feathers, or without a stiffened shaft, as in the true 
woodpeckers, and do not occur in the United States. 
Sub-Family PICINAE. 
Although all the woodpeckers have a certain resemblance to each other, and agree more or 
less in habits, there are distinctions among them which serve readily for division into sub- 
genera, genera, or even higher groups. Thus the difference between the ivory-billed woodpecker 
and the common flicker, which may be taken as representing the extremes of the scale in 
North American species, will be palpable to any observer. 
In the woodpeckers inhabiting the United States there are three distinct groups, which may 
be taken with some authors as so many sub-families ; or if, with Bonaparte, we unite all 
the Picidae with stiffened, acuminate, and pointed tails into a sub-family Picinae, they will 
constitute so many separate sections. They may be severally characterized as follows : 
Picinae or Piceae. — Bill more or less long ; the outlines above and below nearly straight ; the 
ends truncated ; a prominent ridge on the side of the mandible springing from the middle of 
the base, or a little below, and running out either on the commissure, or extending parallel to 
and a little above it, to the end, sometimes obliterated or confluent with the lateral bevel of 
the bill. Nostrils considerably overhung by the lateral ridge, more or less linear, and con- 
cealed by thick bushy tufts of feathers at the base of the bill. Outer posterior toe generally 
longer than the anterior. 
Melanerpinae or Centureae. — Bill rather long ; the outlines, that of the culmen especially, 
decidedly curved. The lateral ridge much nearest the culmen, and, though quite distinct at 
the base, disappearing before coming to the lower edge of the mandible ; not overhanging the 
nostrils, which are broadly oval, rounded anteriorly, and not concealed by the bristly feathers 
at the base. Outer pair of toes nearly equal ; the anterior rather longer. 
Colaptinae or Colapteae, — Bill much depressed, and the upper outline much curved to the 
acutely pointed (not truncate) tip. The commissure considerably curved. Bill without any 
ridges. The nostrils broadly oval, and much exposed. Anterior outer toe longest. 
