HYDROCORAX. 327 



Genera. 



a 1 . Tail uniform, white, dirty buff, or yellowish brown, with no black bar. 

 6 1 . Bill bright red for its basal half at least; body plumage not all black. 



Hydrocorax (p. 327) 

 ft 2 . Bill not red; plumage, except tail, all black. 



c 1 . Bill entirely black , Anthracoceros (p. 330) 



c 2 . Bill nearly all white Gymnolaemus (p. 331) 



a 2 . Tail not uniform in color, a wide black or blackish bar at its end. 



6 1 . Bill not bright red '. Penelopides (p. 332) 



6 2 . Bill bright red.. _ Craniorrhinus (p. 338) 



Genus HYDROCOKAX 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 1 . Upper outline of casque straight, its anterior end forming a projection which 

 overhangs the culmen in front. 



ft 1 . Casque and bill entirely bright red hydrocorax (p. 327) 



6 2 . 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 (Linnaeus). 

 LUZON CALAO. 



Buceros hydrocorax LINNAEUS, Syst. Nat. ed. 12 (1766), 1, 153. 



Hydrocorax hydrocorax GRANT, Cat. Birds Brit. Mus. (1892), 17, 358; 

 SHABPE, Hand-List (1900), 2, 64; McGREGOB and WORCESTER, Hand- 

 List (1906), 55. 



Ca-lao, Manila; reloj del monte, Spanish name. 



Luzon (Meyer, Mollendorff, Everett, Steere Exp., Whitehead, McGregor); Ma- 

 rinduque (Steere Exp.). 



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-brawn of lower throat and sides of neck 

 and head; breast and sides black; abdomen, thighs, and crissum dull 

 chestnut ; back, rump, 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." (Everett.) Length of male, 



