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Show 16 MR. F. E. BEDDARD ON THE [Jan. 15, Falces rather shorter than the caput, strong, prominent, of a dull yellow-brown colour. Maxilla' dull blackish, extremities pale yellowish. Labium dull black, apex pale. Sternum elongate, narrow; the basal joints of the legs are articulated around it on the same plane, the first two pairs with their coxfe almost contiguous on their inner sides. Abdomen narrow, elongate-oval, strongly and broadly constricted towards the fore extremity ; pedicle as long as the caput, two-jointed, the posterior joint longest and set in a circular cavity or socket at the extremity of the abdomen. Colour black, a little paler at the constricted part, just below the sides of the constriction white. Hab. Singapore. Sent by Mr. H. N. Ridley to Mr. R, Shelford. EXPLANATION OF PLATE V. Fig. 1. Cyrtarachne conica, 2 (p. 13). la, profile: 1 b, eyes and falces from in front; 1 C, genital aperture. 2. Prosthesima albomacidata, 2 (P- H ) - 2a, profile; 2>>, eyes and falces from in front; 2 c, genital aperture. 3. Titus lityens, 2 (p-13). 3 a, profile ; 3'', eyes and falces from in front; 3c, maxilla1, labium, and sternum ; 3d, cephalothorax and eyes from above and behind ; 3e, genital aperture. 4. Amye'nea lineatipes, 2 (p. 14). 4«, profile; 4b, eyes and falces from in front; 4 c, eyes and cephalothorax from above and behind; 4 d, genital aperture. 5. (Ecophylla smaragdina Op. 15). (Ant with which Amyciaa lineatipes lives.) 6. Salticus attenuatus, J (p. 15). 6 a, profile ; 6 b, cephalothorax and connecting pedicle from above ; 6 c, genital aperture. (It is doubtful whether this example is quite adult.) 3. Notes on the Anatomy of Picarian Birds.-No. IV. On the Skeletons of Bucorvus cafer and B. abyssinicus ; with Notes on other Hornbills. By FRANK E. BEDDARD, M.A., F.R.S., Prosector and Vice-Secretary of the Society. [Received January 14, 1901.] (Text^figures 2-5.) The opportunity of comparing the two known species of Ground- Hornbills, Bucorvus cafer and B. abyssinicus, has been afforded me by the death of an example of each of them during the past year in the Society's Gardens. I have taken the opportunity of comparing the structure of the genus Bucorvus with several forms of arboreal Hornbills, of which I possess skeletons, with a view of separating from a general description of Bucorvus those features in which it is different from other Hornbills, and which are therefore distinctive characters of the genus, or subfamily as some would prefer to regard it. I limit myself in the present communication to the skeleton, |