236 PHILOSOPHY OF ZOOLOGY. 



Tarsi short. 



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

 rius. 



47. CACHINNA. Tarsi reticulated. F. cacliinnans. 



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. 



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

 r 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 brachyotys. 



49. ULULA. Head destitute of ears. Sfrix nebulosa of 

 GML. 



Bill straight at the base. Without horns. 



50. ALUCO. Barn owl. Toes thinly feathered. Stnx 

 Jlammea, LIN. 



(2.) 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. Strix scops; now S. Aldro- 

 vandi. 



Head naked- 



53. STRIX. Toes closely feathered. S. stndula. 



