314 
ON THE CLASSIFICATION OF BIRDS. 
the sides compressed from the nostrils. Wings 
‘rather lengthened; the second quill hardly shorter 
than the third. Tarsus short, slender, of equal length 
with the two external toes. Hinder toe shorter than 
tile tarsus. Tongue cartilaginous, flat, as long as the 
bill. The fissirostral type. 
Z. procurvis. PI. Col. 23. bivittatus. Spix, i. 90. f. 1 . 
Dendrocops, Sw. {fig. 281. c) Bill lengthened, nearly 
straight ; the sides widened, quadrangular ; the base 
broader than high : the tip of the upper mandible 
abruptly deflexed over that of the lower, and obsoletely 
notched. The dentirostral type. 
D. platyrostris. Spix, i. 89. 
Sitlasomus, Sw. {fig.9,9i\.d') Bill short, weak, resembling 
that of a Sylvia; rather widened at the base, beyond 
which the margin of the upper mandible is inflected. 
The hind claw is longer than the toe, and nearly 
straight. The tenuirostral type. 
S sylviellus. PI. Col. 72. f. 1. 
Dendroplex, Sw. {fig. 281. c) Bill moderate, very 
straight, perfectly conic in profile; the sides much 
compressed. Tongue very long, vermiform; extend- 
ing, when thrown out, to more than twice the length of 
the bill ; the tip hard, acute. The scansorial type. 
D. guttatus. Spix, i. 91. f. 1. 
ScLERURUS, Sw. {fig. 76. Vol.I. p.42.) Bill lengthened, 
compressed. Commissure and under mandible straight. 
Culmen of the upper mandible bent towards the tip, 
and reflected over the lower, where it is distinctly 
notched. Wings moderate, rounded ; the first and 
second quills graduated ; the three next equal, and 
longest. Tail very broad, soft, and rounded ; the 
tips obtuse, but with the shafts very rigid, and 
slightly projecting. Feet large, rathef strong. Mid- 
dle toe longest, united to the outer for half its length ; 
inner toe much shorter than the outer, connected at 
the base to the middle toe ; hind toe and tarsus 
