AVES — FALCONID^. 



589 



Strigiceps, Bp. Saggio Distr. Met. Anim. Vertebr. p. 37 



( 1 83 1 ) C cyaneus. 



Glaucopteryx, Kaup, Class. Saug. u. Vog. p. 113 (1844). C. pygargus. 



Fig. 294. 



Circus hudsonius. Detail of foot. From bird just killed. Natural size. 



Spizacircus, Kaup, Mus. Senckenb. iii. p. 258 (1845) . C. buffoni. 



Spilocircus, Kaup, Isis, 1847, p. 89 C. asshnilis. 



Pterocircus, Kaup, Arch. f. Naturg. xvi. p 32 (1850) . . C. pygargus. 



