AUGUST, 1918. 



Canada 



Geological Survey 

 Museum Bulletin No. 28 



BIOLOGICAL SERIES, No. 7. 



CONTENTS. 



PAGE. 



Introduction ' 



Vultures * 



Harriers 2 



Accipiters 



Buteos and Rough-legs 



Eagles 10 



Falcons 



Fish Hawk 12 



Illustrations. 



Plate I. A. Marsh Hawk, adult male and juvenile 15 



B. Goshawk, adult and juvenile 15 



II. A. Sharp-shinned Hawk, adult and juvenile. In colour almost indis- 

 tinguishable from Cooper's Hawk 16 



B. Red-tailed Hawk, adult and juvenile in most characteristic plumage. 16 



III. A. Swainson's Hawk. Partial light phase and dark phase 



B. Duck Hawk, adult and juvenile 



IV. A. Sparrow Hawk, male and female. 



B. Osprey 



Figure 1. Notched primaries (four) of Red-tail and Rough-leg 



2. Notched primaries (three) of Swainson's Hawk 



3. Feathered leg of Rough-leg and Golden Eagle 



4. Narrow bill of American Rough-leg 



5. Wide bill of Ferruginous Rough-leg 



18 

 18 

 7 

 7 

 8 

 9 



o o ____ o 9 



6\ Toothed bill of Falcons . . . .". 



7. 'Untoothed bill of all other hawks ' II 



