8 PICARKITAS 
KEY TO THE SPECIES 
A. Anterior part of casque raised above the culmen, 
1. Bill and casque entirely brick-red . RASS ot c ee . H. PLANICORNIS. 
2 Anterior half of bill yellowish-while. . . Doe » » »« « « Hi MINDANENSIS. 
B. Anterior part of casque not raised above the culmen, 
Bie a0 tEtU 2c ae et ee ee . . H SEMIGALEATUS. 
1. Hydrocorax planicornis ( \Merrem). (Plate 1, Fig. 4.) Luzon, Marinduque 
. : - I : Philippi Ss): 
Buceros hydrocorax Linneus, Syst. Nat. Vol. 1, p. 153 (1766). Philippine. Island 
Buceros bicornis var. Shaw, Gen. Zool. Vol. 8, p. 17 (1811). 
Buceros planicornis, Merrem, Ersch. u. Grub. Encycl. Vol. 13, p. 287 (1824). 
Buceros platyrhynchus Pearson, Journ, Asiat. Soc. Beng. p. 652 (1841). 
Hydrocorax planicornis Bonaparte, Consp. Volucr. Anisod. p. 2(1854); Elliot, Menogr. 
Buceret. pl. 7 (1882); Dubois, Syn. Avium, Vol. 1, p. 100 (18g9). 
Platyceros hydrocorax, Cabanis & Heine, Mus. Heinean. Vol. 2, p, 174 (1860). 
Hydrocorax hydrocorax, Ogilvie-Grant, Cat. Birds Brit. Mus. Vol. 17, p. 358 (1892). 
2. Hydrocorax mindanensis (| weediale). Mindanao, Basilan | Phi- 
Buceros mindanensis weeddale, Proc. Zool. Soc. Lond. pp. 543, § lippine Islands). 
Chall. p. 15, pl. 3 (188u) 
23 (1878); Sclater, 
Hydrocorax mindanensis Elliot, Monogr. Bucerot, pl 8 (1882); Ovilvie-Grant, Cat. 
Birds Brit. Mus. Vol. 17, p. 359 (1892!. 
Buceros hydrocerax var, mindanensis Dubois, Bull. Mus. Hist. Nat. Belg. Vol. 3, p. 196 
(1884). 
Hydrocorax planitcornis var. mindanensits Dubois, Syn. Avium, Vol. 1, p. 100 (1899). 
3. Hydrocorax semigaleatus (Tweeddale). Samar, Panaon, Leyte 
: = ; z = ; -hilippi S : 
Buceros semigaleatus Tweeddale, Proc. Zool. Soc. Lond. pp. 279, 341, 379 (1878). (Philippine Islands 
Hydrocorax semigaleatus Elliot, Monogr. Bucerot. pl. 9 (1882); Dubois, Syn. Avium, 
Vol. 1, p. 100 (1899). 
Buceros hydrocorax var, semigaleata Dubois, Bull. Mus. Hist. Nat. Belg. Vol. 3, p.196 (1884). 
6. GENUS ANTHRACOCEROS REICHENBACH 
Anthracoceros Reichenbach, Syst. Avium, Pt. 49 (1849) (type : Buceros malabaricus). 
Synonyms : Hydrocissa Bonaparte, Consp. Gen. Avium, Vol. 1, p. 90 (1850) (type : Buceros mono- 
ceros); Limnophalus Elliot, Monogr. Bucerot. texte of pl. 25 (1882) (type : Buceros montant) ; 
Gymnolaemus Ogilvie-Grant, Cat. Birds Brit. Mus. Vol. 17, p. 370 (1892) (type : Anthracoceros marchit). 
Characters. Bill large, compressed, abruptly curved at tip; casque large, sub-crescentic, 
somewhat swollen posteriorly, compressed and elevated anteriorly, extending over the basal 
three-fifths of, and forming an obtuse angle with the culmen. Skin around eyes and sides of 
throat naked, latter rarely entirely naked. Crest and wings moderate. 
Geographical’ Distribution. South and South-eastern Asia, Java, Sumatra, Borneo 
and Sooloo, 
KEY TO THE SPECIES 
lL. Middle tail-feathers black or black tipped with white. 
A. Outer tail-featiters white. 
a. Casque with a great black patch extending over the grealer part. 
1. Casque black posteriorly (co), or not black posteriorly (Q). . . . . «. A. CORONATUS. 
