STRIDES 



251 



has mentioned the existence among the Striges of a ' scapula 

 accessoria.' The coracoids are not in contact at their articu- 

 lation with sternuni ; the procoracoids are moderately large,, 

 and the clavicle reaches both them and the scapula. 



If it were not for Pliotodilus, it might be possible to 

 divide the Striges into two families, Strigidse and Bubonidse. 

 As it is, it may perhaps be permissible to regard the order as 

 containing but one family, but two sub-famiHes, viz. Strigina& 



Fig. 129. — Syrinx of Scops leucotis 

 (apter Beddabd). 



Fig. 130.— Strinx op Bubo 

 (after Beddard). 



and Buboninag, to which possibly a third, Photodilinse, might 

 be added, 



The syrinx of the Striges has been chiefly described by 

 WuNDEELiCH ' and by myself.^ This group is one of the 

 few that present the remarkable variety of the voice organ 

 which has been termed the bronchial syrinx. All the owls, 

 so far as they have been examined, possess one pair of 

 intrinsic muscles and the usual one pair of extrinsic muscles, 

 Scops leucotis has the most modified syrinx. In this bird 

 (see fig. 129) the intrinsic muscles are attached so far down 

 the bronchus as to the tenth bronchial ring, and, as will be 



' ' Beitrage zur vergleichenden Anatomie und Entwiokluugsgeschichte des 

 unteren Kelilkopfes der Togel,' Nov. Act. Leap. Akad. xlviii. 1884, p. 1. 

 ' ' On tlie Classification of the Striges,' Ibis (5), vi. p. 355. ■ 



