1 g MB. r. E. BBDDAED ON THE [Jan. 15, 



Falces rather shorter than the caput, strong, prominent, of a dull 

 yellow-brown colour. 



Maccillm 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 cox^e almost contiguous on their inner sides. 



Ahdomen narrow, elongate-oval, strongly and broadly constricted 

 towards the fore extremity ; pedicle as long as the caput, two- 

 iointed, 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. 



Eab. Singapore. Sent by Mr. H. N. Eidley to Mr. E. Shelf ord. 



EXPLANATION OF PLATE V. 



Fig. 1. Cyrtarachne coniea, $ (p. 13). la, profile; lb, eyes and falces from 

 in front ; 1 c, genital aperture. 



2. Prosthesima albomaeulcda, J (p. 11). 2a, profile; 2?», eyes and falces 



from in front; 2c, genital aperture. 



3. Titus lugens, 5 (p- 13). 3 «, profile ; 3 h, eyes and falces from in front ; 



3 c, maxilla;, labium, and sternum ; 3f?, cepbalothorax and eyes from 

 above and behind ; 3 e, genital aperture. 



4. Amycicea lineatipes, $ (p. 14).' 4 a, profile ; 4 b, eyes and falces from 



in front ; 4 c, eyes and cepbalothorax from above and behind ; 4 d, 

 genital aperture. 



5. (Eco'phylla smaragdina (p. 15). (Ant with which Amyciaa Iweatipes 



lives.) 



6. Sa/ticus attenuatus, § (p. 15). 6 «, profile; 6 b, cepbalothorax and 



connecting pedicle from above ; 6 c, genital aperture. (It is doubtful 

 whether this example is quite adult.) 



3. Notes ou the Anatomy of Picarian Birds. — No. IV. On 

 the Skeletons of Bucorvus cafer and B. ahyssmicus ; with 

 Notes on other HornbilLs. By Frank E. BeddarDj 

 M.A.J F.R.S., Prosector and Vice-Secretary of the 

 Society. 



[Eeceived 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 com- 

 paring 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 there- 

 fore distinctive characters of the genus, or subfamily as some 

 would prefer to regard it. 



I limit myself in the present communication to the skeleton, 



