HYDROCORAX. 327 
Genera. 
a, Tail uniform, white, dirty buff, or yellowish brown, with no black bar. 
b+. Bill bright red for its basal half at least; body plumage not all black. 
Hydrocorax (p. 327) 
b?, Bill not red; plumage, except tail, all black. 
Cod STUNTS TE iS) Ah 2) | 2 ae OE a Anthracoceros (p. 330) 
Copp Ey emen kliyaral Uv y NGO sscee re ate tes ce .c a cencctbetoaeecnsaptesecneteae Gymnolemus (p. 331) 
a@?, Tail not uniform in color, a wide black or blackish bar at its end. 
Dr veMSIL PMOL NGEIIEG TOUS ester ere seta. ace sbicnestocmsnatcecnsuectace Penelopides (p. 332) 
Gry nalibrigiitimedsss ee eck ash cee Ll coatele Craniorrhinus (p. 338) 
Genus HYDROCORAX Brisson, 1760. 
Bill and casque very large, the latter flat on top, overhanging on each 
side and its posterior border overhanging and extending to above the ear; 
bill smooth except for a few shallow furrows on base of lower mandible; 
chin and throat feathered; a small bare space about the eye. 
Species. 
a', Upper outline of casque straight, its anterior end forming a projection which 
overhangs the culmen in front. 
b+, Casque and bill entirely bright red........................:.-.s0ec0-0-+- hydrocorax (p. 327) 
b*. Casque and basal half of bill bright red, terminal half of bill whitish. 
mindanensis (p. 328) 
a?, Upper outline of casque not straight, its anterior end sinking to the culmen and 
not forming an anterior overhanging projection............ semigaleatus (p. 329) 
289. HYDROCORAX HYDROCORAX (Linnezus). 
LUZON CALAO. 
Buceros hydrocoraz LINN&XUS, Syst. Nat. ed. 12 (1766), 1, 153. 
Hydrocorax hydrocorax GRANT, Cat. Birds Brit. Mus. (1892), 17, 358; 
SHARPE, Hand-List (1900), 2, 64; McGrrecor and WorcestTER, Hand- 
List (1906), 55. 
Ca-lao, Manila; reloj del monte, Spanish name. 
Luzon (Meyer, Méllendorff, Everett, Steere Exp., Whitehead, McGregor) ; Ma- 
rinduque (Steere Ezp.). 
Adult.—Chin, upper throat, a band from throat to eye, and feathers 
above eye, all black, followed on throat by a white space which shades 
gradually into the dull chestnut-brown of lower throat and sides of neck 
and head; breast and sides black; abdomen, thighs, and crissum dull 
chestnut ; back, ramp, and wings brown, the rump lighter; primaries and 
most of the secondaries black, some of the latter edged with pale buff; 
tail-feathers pure white when fresh but soon becoming yellow or dirty 
buff. Entire casque and bill bright red. “Naked skin round eye yellow; 
iris red; feet brownish red; nails black.” (Hverett.) Length of male, 
