342 



Mr. F. E. Beddard on the 



Strix flammea. 

 Ketupa javauensis. 

 Bubo virginiauus. 

 Bubo maculosus. 

 Bubo capensis. 

 Syruium indraoee. 

 Syruium aluco. 

 Asio otus. 



Nyctea uivea. 

 Glaucidium passcriuum. 

 Speotj'to cuuicularia. 

 Pulsatrix torquata. 

 Otus bracbyotus. 

 Scops loucotis. 

 Gymuoglaux nudipcs. 



In all these species the sterno-tracJteal muscles are very 

 stout, and there is but a single pair of syrhujtal muscles. 

 The syrinx itself is tracheo-brouchial, though there are indi- 

 cations in several genera (particularly in Scops) of a passage 

 towards a bronchial syrinx, such as is found in certain 

 Cuckoos* and Goatsuckers f. 



The principal diflPerence which I have found to distinguish 

 the syringes of the various genera of Owls concerns the in- 



Fio-. 5. 



Syrinx of StrLv flammea, 



sertion of the intrinsic muscles, that is, their distance from 

 the bifurcation of the trachea. Strix (fig. 5) possesses a 

 typical tracheo-bronchial syrinx. The last tracheal rays are 



* Beddard, " On tlie Structure and Classification of tbe Cuckoos,'' 

 P. Z. S. 1885, p. 1G8. 



t Beddard, " On the Syrinx &c. of the Capriniulgida.'/' 1'. Z. S. 188G, 

 p. 147. 



