436 
RHYOCOrillLUS. — ROLLULUS. 
RHYOCOPHILUS Bonaparte 1854. = Rhyacoiihilus Kaup. 
RHYTICEROS Reiciienbacii, natürl. Syst. Tf. 50. Rhytidoceros Cab. 
RHYTIDOCEROS (Bucerotidae. — fuTLÇ plica, xspaç cornu) Cabanis, Mus. Heine. 
18 GO. II. 172. = Buceros Lin. 
obsciirus Cabanis, Mus. Heine. II. 172. = Buceros ohscurus Gmel. 
plicatus Bonaparte, Consp. Vol. anis. 2. = Buceros ohscurus Gmel. 
subruficollis Horsfield et Moore, Cat. Birds EInd. Cp. II. 600. ~ Buceros 
subruficollis Blytii. 
RHYTIPTERNA Reiciienbacii, natürl. Syst. = Lipaugus Cab. 
RICCORDIA Reichenbacii, Aufz. Colibri 8. = Hylocharis Boie. 
elegans Reiciienbach, 1. c. = Hylocharis elegans Gray. 
Ramondi Reichenbacii, 1. c. = Hylocharis Riccordi Gray. 
verticeps Reiciienbach, 1. c. = Thalurania Fanny Bonap. 
RIMATOR (Certhinae) Blyth, Journ. as. Soc. Bengal 1847. XVI. 154. = Caulo- 
dromus Gray. 
Sy7io}i.: Merva Hodgs. 
Bill longer than the head, compressed, a little incurved, the curvature in- 
creasing to the tip where the extremity of the upper mandible passes and beads 
over that of the lower one, but without any well defined emargination; culmen 
rounded for the terminal two thirds or more, but becoming angulated towards 
the base; and the tomiae but little inflected. The nostrils pierced in an ovale 
basal membrane, their aperture being a little removing from the base of the bill; 
gape extending to beneath the fore part of the eye and unarmed or having but 
a few short and incruspicuous hairs. Legs moderately strong suited for progression 
either upon the ground or up the slanting bough of a tree. The tarse nearly as 
long as the middle toe with its claw and having four long scutae to the front 
and two shorter ones below. Toes rather long, the outer a trifle more so than 
the inner and reaching to the base of the claw of the middle toe; claws not much 
curved, that of the hind toe large, being twice the size of the middle front claw. 
Wings much bowed and rounded, the first primäre, reaching to but half the 
length of the fifth, which equals the two next, and a little exceeds the fourth and 
eighth. The tail short and weax, its feathers slender and flexible, with soft tips a 
little pointed. Plumage lax, being excessively so and very copious over the rump, 
malacoptilus Blyth, Journ. as. Soc. Bengal 1847. XVL 156. = Caulodromus 
Gracei Gray. 
RINOPUS Hodgson 1841. = Ducula Hodgs. 
RISSA (Laridae) Leach. — Stephens, gener. Zool. XHI. 180. = Larus Lin. 
Bill longer than the head, strong, and laterally compressed, with the culmen 
straight at the base and curved from the nostrils to the tip ; the gonys short and 
advancing upwards; the nostrils lateral, basal and the opening longitudinal. Wings 
lengthened and pointed with the first quill the longest. Tail moderate and even. 
Tarsi much shorter than the middle toe, strong and covered in front with trans- 
verse scales. Toes very long, slender, and united together by a full membrane; 
the hind toe rudimental and elevated. 
brachyrhyncha Bruch, Journ. Ornith. 1853. L 103. = Larus Kotzehui. 
brevirostris Brandt, Journ. Ornith. 1855. HI. 285. = Larus Kotzebui. 
Brunnichi Leach. = Larus tridactylus Lin. 
cinerea Eyton, Hist. brit. Birds 52. = Larus tridactylus Lin. 
Kotzebui Bonaparte, Conspect. Avium H. 226. = Larus Kotzebui. 
nivea Gray, Genera Birds III. 654. = Larus canus Lin. 
septentrionalis Lawrence, Ann. Lyc. New York 1858. VL 265. = Larus Kotzebui. 
tridactyla Gray, List. brit. Mus. HI. 174. = Larus tridactylus Lin. 
ROLLANDIA Bonaparte, Compt. rend. 1856. XLIL 775. = Podiceps Lath. 
leucotis Bonaparte, 1. c. = Podiceps Rollandi Schleg. 
micra Bonaparte, 1. c. — Spec, indet. 
ROLLULUS (Perdicidae) Bonnaterre, Encycl. méth. 1740. — Gray, Genera Birds 
1846. m. 507. =z Cryptonyx Tem. 
