16 



THE VOYAGE OF H.M.S. CHALLENGER. 



being white, and the rufous of the thigh-coverts, of the head, nape, and throat, being 

 much darker. 



$ adult. Casque, posterior half of maxilla, rami of mandible, and posterior part of 

 gonys blood-red. Corrugated lateral plates of mandible darker blood-red. Eemainder 

 of bill pale straw-white. Feathers surrounding the eye and clothing the base of man- 

 dible, chin, and gullet black. Head, nape, and upper part of breast, lower throat, and 

 thigh-coverts deep rufous maroon. Upper throat tawny. Breast black. Interscapulars 

 and wing-coverts ruddy brown. Upper tail-coverts ferruginous. Under tail-coverts and 

 vent light dingy rust-colour. Quills black ; secondaries narrowly margined externally 

 with ferruginous, and tipped with rusty white. Rectrices ruddy ochre. 



? adult. Like male, as is the case in Buceros hydrocorax. 



¥ juv. Differs chiefly in the casque not being so fully developed anteriorly and 

 not overhanging the true culmen, and in its culmen being dingy brown and grey-brown, 

 with indications of red on the casque and at base of mandible. The grooved lateral 

 plates have not appeared. The tarsus and feet in all appear to have been blood-red. 

 The figure (PI. III.) is taken from the male specimen, No. 407. 



In the true Buceros hydrocorax slight indications of grooves are perceptible on the 

 walls of the base of the mandible ; but they are cut in the substance of the mandible, and 

 do not form part of an adhering plate. 



17. Lanius lucionensis, Linn. 



Lanius lucionensis, Linn., S. K"., vol. i. p. 135, No. 10, 1766 j Walilen, Trans. Zool. Soc, vol. ix. 

 p. 171, t. xxix. fig. 1 ; Proc. Zool. Soc, 1877, pp. 544, 692, 759; 1878, pp. 342, 380, 

 614, 709, 947. 



[No. 379, $ . Zebu. Eyes hazel.] 



18. Artamus leucorhynchus, Linn. 



Lanius leucorhynchus, Linn., Mantissa Plant, p. 524, " Imarishia," 1771 ; Walden, Trans. Zool. 

 Soc, vol. ix. p. 174, No. 73; Proc. Zool. Soc, 1877, pp. 544, 692, 759, 826; 1878, pp. 

 283, 342, 709, 937; 1879, p. 70. 



[No. 369 X . 1 

 Ttf <nn' o ' I Zebu. Eyes brown. Stomach had insects.] 



