HYDROCORAX. 329 



and the last named also widely margined on both webs with white; rest 

 of secondaries and primaries blackish bro\ni. with a white margin on 

 the outer web, gradually increasing in width on the outer secondaries; 

 under wing-coverts brownish buff ; middle feathers of tail have basal two- 

 thirds brown, and the rest the basal half dull chestnut; the remainder 

 of the feathers white ; casque rudimentary. Bill black, yellowish at the 

 tip; naked skin round eye and on gular region yellow; legs gray-green 

 (in skin)." (Grant.) 



"Habits like those of //. aeniigaJeatus. Eyes yellow to brown in 

 female, light l)luish gray in male; legs and feet red; bill scarlet on basal 

 lialf, rest yellowish white; bill of young birds black. A male measures 

 1)27 in length; wing, 393; tail, 312; tarsus, 54; middle toe with claw, 

 (j(j." {Bourns and Worcester MS.) 



2!U. HYDROCORAX SEM IGALEATUS (Tweeddale) . 

 INTERMEDIATE CALAO. 



Buceros seniigaleatus Tweeddale, Proc. Zool. Soc. (1878), 279. 



Uydrocorax semigaleatns Grant. Cat. Birds Brit. Mus. (1S92), 17, 360; 

 Sharpe, Hand-List (1900), 2, 64: McGregor and Worcester, Hand- 

 List (1906), 55. 



Cao, Bohol. 



Bohol (McGregor) ; Leyte (Everett, Steere Exp., Whitehead) ; Panaon (Eve- 

 rett) ; Saniar (^teere Exp., Bourns d Worcester, Whitehead). 



Adult. — Colors of plumage as in the two preceding species, colors of 

 bill as in //. mindanensis, but the casque abruptly contracted in front 

 and its upper outline, in front, continuous with that of the culmen. 

 "Naked skin round eye darkest sepia, almost black; gular skin dark 

 indian-yellow ; iris light yellow (light green in living bird) ; feet coral- 

 red; nails dark brownish gray." (Everett.) Length of male, about 890; 

 wing, 400; tail, 320; bill from nostril, 153; greatest width of casque, 

 53 ; tarsus, 53. 



"Adult female.— Does not differ in plumage from the male. Length, 

 787; wing, 350; tail, 279; tarsus, 53. 



''i'oung. — Similar to that of If. niindanen.sis, except that the outer 

 tail-feathers have not the basal half chestnut, although the middle feathers 

 are the same. 



"In older examples of both sexes, when the adult plumage has been 

 nearly attained the bill is jet-black, the yellow tip of the young having 

 disappeared, and the anterior part of the casque is distinctly raised above 

 tlie line of the culmen." (Grant.) 



"E.xtremely abundant on th(> liills back of ("atl)alogan in Saniar. 

 Sometimes comes down into tlie mangrove swamps near the town. In 

 damp weather its hoarse cry can readily be heard a mile. T^sually 

 frequents very lofty trees, but may be readily called down by imitating its 



