GENEKIC CnAKACTEES.
Goims XV. ACEllOS.
Head crestod. Bill long, rather narrow, tapering to a point. Onlmen swoEon and sUgMly
elevated at base. Casque none. Maxilla at base ridged, with several transverse grooves. Nude
skin around eyes, at base of mandible, and on throat. Wings long; third, fourth, and fifth
primaries nearly equal and longest. Tail long, slightly rounded. Tarsi rather short and stout.
Toes long, covered with strong scales.
Genus XVI. IIYDEOCISSA.
Head slightly crested. Bill moderately long, curved, sharply pointed. Casque low, covers
the entire culmen to within an inch of the tip of the maxilla, compressed laterally, and indented
by three deep grooves for its entire length. Nude skin around eyes. Wings short. Tail rather
short, rounded. Tarsi and toes short, stout, covered ivith strong scales.
Genus XVII. LOPHOCBEOS.
Head with a short occipital crest. Bill long, curved, slender, graduated to a sharp point.
Nostril round, open, and exposed. A smaU casque commcnees at base of culmen, and extends for
a little over half its length, terminating in a projecting point. Wings long; third primary
longest; first primary very short and narrow. Tail long, sUghtly rounded. Tarsi and toes
short, stout, covered with strong scales.
Genus XVIII. TOOKUS.
Bill long, slender, much curved; maxilla compressed laterally along the culmen. N o casque.
Wings and tail long, the latter rounded. Tarsi and toes short, stout, covered with rather strong
scales. Claws curved, strong, acute.