$10 



STERCORARIUS. JAGER. 



Generic Character. 



Rostrum mediocre, validum, 

 cylindricum, coinpressum, 

 curvatimi ; mandibula su- 

 periore basi cera tecta, 

 apice adunca ; inferiore 

 subtus angulata, apice ro- 

 tundata. 



Nares in cera, et versus api- 

 cem rostri sitae. 



Cauda, rectricibus duabus 

 intermediis elongatis. 



Pedes graciles ; tibia: plumis 

 tectae. 



STERCORARIUS. Briss. 

 LARUS. Linn., Gmel., Lath. 

 CATHARACTA. Ray, Brun. 

 LESTRIS. Illig., Temm. 

 PR^DATRIX. Vieil. 



Beak moderate, strong, cylin- 

 dric, compressed, curved ; 

 the upper mandible fur- 

 nished with a cere at the 

 base, its tip bent down ; 

 the lower angulated be- 

 neath, with its tip rounded* 

 Nostrils placed in the cere, 

 and towards the tip of the 

 beak. 

 Tail, with its two middle 



feathers elongated. 

 Leg's slender; tibia clothed 

 with feathers. 



U NLIKE the Gulls, the Jagers and Skuas are 

 courageous and intrepid birds, and wage eternal war- 

 fare with them : they rarely trouble themselves to 



