Folia Historico-Naturalia Musei Matraensis - A Mátra Múzeum Természetrajzi Közleményei 21. (1996)

In the Kestrels the distal part of corpus phalangis (proximally from the capitulum phalangis) is strongly bending into plantar direction, most pronouncedly so in the Kestrel. In the Hobby and Merlin this arch is much less pronounced (Plate XLIV, Figures 6-10). The dorso-distal edge of condylus medialis and cond. lateralis in the Hobby is protruding, the capitulum phalangis in lateral view is a bit pointed. This characteristic is less pronounced in the Merlin, and in the Kestrel is hardly visible. In the Red-footed Falcon and Lesser Kestrel the capitulum phalangis in lateral view is arch shaped, and smaller in size than in the former species (Plate XLIV, Figures 6-10). The concave parts at the two sides of the capitulum phalangis - the depressio epicondylaris medialis and lateralis - is deeper in the Kestrels than in the other species, and deepest in the Kestrel. The socket of trochlea phalangis - the sulcus intercondylaris - the deepest in the Hobby, and narrow, in the Merlin it is also deep, but wider. In the Kestrels the sulcus intercondylaris is shallower, especially in the Red-footed Falcon, in the Kestrel the socket is extremely wide (Plate XLIV, Figures 1-5). Summary Falco subbuteo: - the corpus phalangis is narrow, - the tuberculum collatérale laterale is big, - the proximal end of the bone on the dorsal side is protruding, the tuberculum extensorium is big, - on the distal part of the corpus the cristae plantares med. et lat. are missing, the plantar side on this section is rounded, the corpus in lateral view is narrowing, - the distal section of corpus in lateral view is only a little bit bending, - the dorso-distal edge of condyli is becoming only slightly pointed (lateral view), - the depressio epicondylaris lateralis and medialis are shallow, - the sulcus intercondylaris is very deep, and narrow (dorsal view). Falco columbarius: - the corpus phalangis is narrow, - the tuberculum collatérale laterale is large, - the proximal end of the bone on the dorsal side is protruding, the tuberculum extensorium is large, - on the distal part of the corpus the crista plantaris medialis and lateralis are missing, the plantar side is rounded, and the corpus in lateral view is narrowing, - in lateral view the distal part of the corpus is only slightly bending, - the dorso-distal edge of condyli becomes slightly pointed (lateral view), - the depressio epycondylaris lateralis and medialis are shallow, - the sulcus intercondylaris is deep. Falco tinnunculus. - the corpus phalangis is wide, - the tuberculum collatérale laterale and tuberculum extensorium are small, - the crista plantaris medialis and lateralis are present at the distal part of the corpus too, the plantar side is wide, and on the distal section is also flat, or concave, - on the plantar side of the corpus there is no protrusion, the phalanx only slightly narrowing in distal direction (lateral view), - the distal part of the corpus in lateral view is very strongly bending, - the depressio epicondylaris lateralis and medialis are very deep, - the sulcus intercondylaris is shallow and wide. 51