46 



TEE ZOOLOGIST. 



The specimens were then mounted in Canada balsam and 

 labelled. 



The following is a list of birds examined, showing the average 

 number of ecto-parasites and endo-parasites per individual : — 



Species of Bird. 



Ecto-parasite 

 per individual. 



Endo-parasite 

 per individual. 



Starling (Stumus vulgaris) 



6-00 



18-00 



160-40 



12-70 



2-00 



2 (hundreds 

 of eggs) 

 eggs 

 120 

 20-30 

 900 



5-5 



2-50 

 100 



1-24 



Blackbird (Turdus merula) 



35-10 



Rook (Corvus frugilegus) 





Thrush (Turdus musicus) 



15-00 



Robin (Erithacus rubecula) 



0-50 



Cuckoo (Cuculus canorus) 



1-00 



Green Linnet (Emberiza citrin 

 Bullfinch (Pyrrhula europaa) 

 Sparrow {Passer domesticus) . 











Kestrel (Falco tinnunculus) 





Peregrine (Falco j)crcgrinus) 



— 



Curlew (Numenius arquata) 



49-50 



Oystercatcher (Hcematoptis ost 

 Kittiwake (Rissa tridactyla) . 



ralegus) ... 



4-20 



Redshank (Totanus calidris) 





Plover (JEgialitis hiaticola) 



7-00 



Woodpecker (Dendrocopus minor} 





Tit (Acredula caudata) 







Mudlark (Anthus obscurns) 



1-20 



Snipe (Gallhiago coilestis) 





Chaffinch (F ring ilia Calebs) 





Lesser Black-backed Gull (Larus fuscus) 

 Herring Gull (L. argentatus) 



2 

 1 



Tawny Owl (Syrnium aluco) 









Twenty-four different species of birds were thus examined. 

 The blanks are due to the fact that comparatively few birds 

 of that species were examined, and therefore no data of any 

 value could be obtained for the other columns. 



From the above table, rough as it is, there seems to be a 

 relation between the number of lice externally and the number of 

 parasites internally, with the exception of the Rook and Hawks, 

 in which no endo-parasites were found, probably due to the 

 abundance of gastric fluid secreted, and which thus limits the 

 possible number of endo-parasites to a very few, namely, those 



