286 



M. Menzbier on the Birds of European 



Concisely, the differences between Falco peregrinus and 

 Falco leucogenys are as follows : — 



F. peregrinus. 

 "Very massive ; feathers under- 

 neath the eye dark, confluent with 

 a broad uioustachial baud ; pale 

 patches on the nape, which dis- 

 appear with the advance of age; 

 very variable in shades of colour, 

 but more clearly coloured speci- 

 mens have the breast and abdo- 

 men either white or tinged with 

 grey. 



F. leucogenys. 

 Very elegant ; feathers under- 

 neath the eye unspotted fulvous or 

 only with brownish-grey traces, 

 clearly defined from a narrow 

 moustachial band; the nape mot- 

 tled with fulvous during its whole 

 life ; very constant in the shades 

 of colour, clear bluish grey above, 

 white tinged with fulvous on the 

 under surface of the body. 



The following is a more detailed description of Falco 

 leucogenys : — 



Adult male. Above clear bluish grey, only indistinctly barred 

 with darker grey and with paler-coloured lower back, rump, 

 and upper tail-coverts ; the forehead whitish ; the nape 

 mottled with fulvous ; the feathers underneath the eye un- 

 spotted fulvous or only with brownish-grey traces ; a narrow 

 moustachial band dark bluish grey ; tail bluish grey, tinged 

 with brownish and barred with darker grey (seven transverse 

 bars); quills dark brown, externally shaded with grey; chin 

 white ; rest of the under surface tinged with fulvous, the 

 throat unspotted, the breast and abdomen only with traces 

 of bluish-brown spots, inclining to narrow bars on flanks and 

 under tail-coverts ; thighs tinged with blue and mottled with 

 transverse spots ; under wing-coverts creamy white mottled 

 with brown ; axillaries white barred with brown. 



Adult female. Similar to the adult male, but more deeply 

 coloured above and more spotted on its under surface. The 

 nape mottled with fulvous, as in the adult male. 



Young male. Above brown ; the forehead whitish ; crown 

 broAvnish fulvous, with conspicuous margins of fulvous ; the 

 nape and hind neck pale rufous mottled with brown ; the 

 back, rump, scapularies, and wing-coverts brown margined 

 with rufous, the upper tail-coverts brown barred with rufous ; 

 tail greyish brown, edged and barred with pale rufous ; quills 



