18 PICARIAL 
14. GENUS RHABDOTORRHINUS MEYER & WIGLESWORTH 
Hydrocissa (part.) Bonaparte (type : Buceros monoceros). 
Rhabdotorrhinus Meyer & Wiglesworth, Abh. Mus. Dresden, no. 8, p. 6 (1895) (type : Buceros exavatus). 
Characters. Bill moderate, curved, sharply pointed; casque low, compressed laterally, 
and indented by three deep grooves for its entire length. Wings short. Tail rather short, 
rounded. Sides of head and throat white in the male, black in the female, Size small. 
Geographical Distribution. Celebes, (Malacca ?), 
1. Rhabdotorrhinus exaratus (Temminck). (Plate 2, Fig. 2.) Celebes. 
Buceros exarhatus Temminck, P]. Col. Vol. 2, p. 90, pl. 211 (1823). 
Buceros exarhaetus Blyth, Journ. Asiat. Soc. Beng. Vol. 16, p. 997 (1847). 
Buceros exavatus Blyth, Cat. Birds Asiat. Soc. Beng. p. 44 (1849). 
Hydrocissa exavatus Bonaparte, Consp. Gen. Avium, Vol. 1, p. 90 (1850); Elliot, Monogr. 
Bucerot. pl. 46 (1882); Dubois, Syn. Avium, Vol. 1, p. 103 (1899). 
Anorrhinus exaratus Bonaparte, Consp. Volucr, Anisod. p. 2 (1854). 
Penelopides exarvatus Ogilvie-Grant, Cat. Birds Brit. Mus. Vol. 17, p. 376 (1892). 
Rhabdotorrhinus exaratus Meyer & Wiglesworth, Abh. Mus. Dresden, no. 8, p. 6 (18095). 
15. GENUS LOPHOCEROS HEmprICH & EHRENBERG 
Lophoceros Hemprich & Ehrenberg, Symb. Phys. Avium, fol. 2 (1828) (type : Buceros nasutus). 
Rynchoceros Gloger, Hand-u. Hilfsb. p. 335 (1842) (type : Buceros melanoleucus). 
Grammicus Reichenbach, Syst. Avium, pl. 49 (1849) (type : Buceros nasutus). 
Ocyceros Hume, Nests and Eggs Ind. Birds, p. 113 (1873) (type : Buceros gingmuanus). 
Orizocerus Oberholzer, Proc. U. 5. Nat. Mus. Vol. 22, p. 28 (1899) (type : Buceros hartlaubi). | cee 
Characters. Bill moderate, curved, with a small keel-shaped casque, which is rarely 
wanting. Sides of throat more or less naked. Head with a short occipital crest, Wings mode- 
rate. Tail long 
g, slightly rounded. Size small. 
Geographical Distribution. India, Ceylon, Africa. 
KEY TO THE SPECIES 
A. A wide superciliary stripe, chin, breast and rest of under parts white; rest of the body 
grey, palest on the chest and nape, inclining to brown on the back and tail. 
t. Middle pawy of tail-feathers longest and slightly, the outer pairs widely tipped 
DONE, po) 5. Gin Caen te oe Bes ee ee poe ee BS TROSIRION 
B. Wing-coverts neither spotted nor margined with white. 
a. Breast and belly white. 
a’. Bill orange-red ; four outer pairs of tail-feathers with white tips. 
2. Sides of the head with very small white striations; no white over the eyes . . . LL. MELANOLEUCUS. 
al’, Sides of the head with much larger white striations. 
3. White feathers over the eyes; plumage much paler . . . . . . . . . (LL. ANGOLENSIS. 
4. A large white band over the eyes joining behind the nape; sides of the head white 
Varieoaten WiuniOlack, 6 3 1 « =) = es) 3 ee ee SE lS IGEDORNSIS: 
