236 PHILOSOPHY or zoology. 



Tar^i bhort. 



46. AsTUU. Goshawk. Tarsi plated. F. palumba- 

 rius. 



47. Cachinna. Tarsi reticulated. F. cachinnans. 



b. Bill without cere. Eyes directed forward, and sur- 

 rounded by a circle of radiating wiry feathers. The external 

 toe capable of reversing its position and motion. On the 

 top of the head, in some species, are two tufts of long 

 feathers, termed ears or horns. Outer web of the first quill 

 feather serrated. These are crepuscular feeders. 



(] .) The feathers, or concha of the ear, occupying nearly 

 the whole side of the head. Last joint of the toes plated. 

 Wings extending beyond the tail. First feather in the 

 wing longest. 



Bill arched from the base. 



48. Otus. Horned owl. Head eared. Toes closely 

 feathered. O. vulgaris and hrachyotus. 



49- Ulula. Head destitute of ears. Strix nebulosa of 

 Gml. 



Bill straight at the base. Withoijt horns. 



50. Aluco. Barn owl. Toes thinly feathered. Strix 

 flamniea, Lin. 



(^.) Concha of the ear extending only to about one-half 

 of the side of the head. The disc of feathers around the eye 

 is less perfect than in the preceding genera. 



Head eared. Bill black. Irides yellow. 



51. Bubo. Eagle owl. Toes closely feathered. Strix 

 bubo. 



52. Scops. Feet naked. Str'uv scop.s- ; now S. Aldro- 

 x'andi. 



Head naked. 



53. Strix. Toes closely leathered. .S'. .stndidn. 



