Ibis. 1917. PI. V. 







MENPES PRESS, WATFORD 



H. Griinvold. 



Figs. I. 2. FALCO SEVERUS. 



Figs. 3. 4. FALCO PEREGRINUS PEREGRINATOR. 



Figs. 5. 6. FALCO SUBBUTEO CENTRALASI^. 



