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Show 544 MARQUIS OF TWEEDDALE ON THE [June 19, plate on the basal part of the sides of the mandible, by the casque being narrower, by the general dimensions being less, and by the anterior three fourths of the mandible and about the anterior half of the maxilla being white, and the rufous of the thigh-coverts, of the head, nape, and throat being much darker. cf adult. Casque, posterior half of maxilla, rami of mandible, and posterior part of gonys blood-red. Corrugated lateral plates of mandible darker blood-red. Remainder of bill pale straw-white. Feathers surrounding the eye and clothing the base of mandible, 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. 2 adult. Like male, as is the case in B. hydrocorax. 2 juv. Differs chiefly by 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. In true B. 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. B. mindanensis o* „ „ 2 Juv- Wing. in. 1600 15-50 14-25 14-25 Tail. in. 1425 14-00 12-50 13-50 Tarsus. in. 300 300 2-75 300 Mid. toe. in. 2-00 1-60 1-75 1-75 Bill, from gape. in. 7-00 6*02 6-25 5-62 Casque. Length. in. 5-75 6-00 5-75 450 Breadth. in. 2-30 200 1-87 1-50 17. LANIUS LUCIONENSIS. Lanius lucionensis, Linn., S. N. i. p. 135, No, 10 (1766); Walden, t. c. p. 171. no. 72, t. xxix. f. 1. [No. 379, tf. Zebu. Eyes hazel.] 18. ARTAMUS LEUCORHYNUS. Lanius leucorhynus, Linn., Mantissa Plant, p. 524, " Imarishia " (1771) ; Walden, t. c. p. 174. no. 73. [No. 369, o M r y . - r , , o , , , . No. 370 2 I ^ebu* -**-*yes brown. Stomachs had insects.] Not hitherto recorded from Zebu. Philippine examples of this species exhibit two slightly differing phases of dress, one in which the upper plumage is of a light bluish and cinereous colour, the |