no. 3609 DATA PROCESSING SEABIRDS — KING, WATSON, GOULD 21 



144000 Stercorariidae 



144100 Stercorarius 



144101 S. pomarinus 



144103 5. longicaudus 

 144200 Catharacta 



144201 C. skua 

 145000 Larinae 



145100 Larus 



145101 L. artri cilia 



145145 L. delawarensis 



145184 L. glaucescens 



145185 L. hyperboreus 

 146000 Sterninae 



146100 Anous 



146101 A. stolidus 



146110 A. tenuirostris 

 146200 Procelstema 



146201 P. cerulea 

 146300 Gygis 



146301 G. alba 

 146800 Sterna 



146801 S. bergi 



146829 5. hirundo 



146835 S. paradisaea 



146857 S. sumatrana 



146866 5. lunata 



146867 S. fuscata 



TABLE 2.— Codes for sighting deck 

 Species identification reliability: 36 Number reliability: 42 



Sighting as a whole reliable Actual count 



1 Sighting as a whole questionable 1 ± 5 per cent 



2 Either this or next most similar 2 ± 10 per cent 



form 3 ± 15 per cent 



3 This or any similar form 4 ± 20 percent 



4 Genus reliable, species 5 ± 25 percent 



unreliable 6 ± 30 or 33 per cent 



5 Genus unreliable, species 7 ± 40 per cent 



unreliable 8 ± 50 per cent 



6 Sighting as whole unreliable 9 Present, but no count possible 



