XXI 

 XXII 

 XXIII 

 XXIV 

 XXV 

 XXVI 

 XXVII 

 XXVI II 

 XXIX 

 XXX 

 XXXI 

 XXXII 

 XXXIIIa-b 

 XXXIIIc 

 XXXIVa 

 XXXIVb 

 XXXV 

 XXXVI 

 XXXVII 

 XXXVIIIa 

 XXXVIIIb 

 XXXIX 

 XL 



ILLUSTRATIONS 



Feather Louse from Common Tern 130 



The two main types of Feather Lice 131 



Different kinds of Feather Lice 146 



Eggs of Wing Feather Louse 147 



Trypanosoma 162 



Sand-Martins preparing to migrate 163 



Fluke, Roundworms and Tapeworm 178 



Intermediate hosts of Herring-Gull Fluke 179 



Biting Midge 210 



Mosquitoes which feed on Birds 2 1 1 



Feather Mites 226 



Sheep Tick 227 



Common House-Martin Flea 242 



Leg of Shearwater Flea 242 



Cormorant Colony 243 



Shearwater at entrance to its burrow 243 



Sand-Martin at nest burrow 258 



Bed-bug and Swallow-bug 259 



White throat removing parasites ? 264 



Arctic Skua * 265 



The Cuckoo 265 

 House-Martins collecting mud for their nests 268 



Birds congregating on the sea shore 269 



VIU 



