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

large, and hence its radius can be clearly separated from that of the Red-footed Falcon and Lesser Kestrel. From the Merlin can be separated only if we know the sex of the specimens. In the case of the Kestrel the values overlap with all the species (Plate XII, Figure 2). The radius of the Hobby and Merlin can be separated from that of the Kestrels on the basis of the curve of the distal end of the bone (DD) and the GL/DD ratio. The tuberculum aponeurosis (tub. mediale, OTTO, 1981) at the distal end of the bone is largest in the Hobby, and the end of the bone bends more in caudal direction than in the Merlin. The ventro-proximal edge of the tuberculum aponeurosis in the Hobby is more elevated and more pointed than in the Merlin, and hence the distal end of the bone is more rectangular in caudal view than in the latter species (Plate XXXVIII, Figure 5). Usually in the Kestrel the tuberculum aponeurosis is thicker, more knobby on the distal part than in the Red-footed Falcon (ventral view), and the end of the bone is curving stronger in a higher angle in caudal direction than in the latter. Furthermore, similarly to the formerly described two species the ventro-proximal edge of the tuberculum aponeurosis in the Kestrel is more elevated and more pointed than in the Red-footed Falcon, where the transition into the corpus radii is more arched. Consequently in the Kestrel the distal end of the bone is more square than in the Red-footed Falcon (caudal [interosseous] view, Plate XXXVIII, Figures 6-7). In the Merlin the proximal part of the corpus radii is wider, and more flattened in cranio-caudal direction than in the Hobby. In the Kestrels the corpus radii is more cylindrical than in the former species, but the proximal section in the Kestrel is a bit more flattened than in the Red-footed Falcon. The rib at the ventral edge of sulcus tendineus on the cranial side of the distal end of the bone is most developed in the Hobby, then follows the Merlin, and even in the Red-footed Falcon is more visible than in the Kestrel and Lesser Kestrel. The tuberculum at the middle of the caudal edge of facies articularis radiocarpalis (later referred to as tuberculum ulnare) is almost undetectable in the Kestrel, but in the Red-footed Falcon is more elevated and separated from the tuberculum aponeurosis. Similarly in the Merlin the tuberculum ulnare is separated more from the tuberculum aponeurosis than in the Hobby. Summary Falco subbuteo. - the corpus radii is thick, the ends of the bones are large, - the distal end of the bone in caudal view is angular, - the tuberculum aponeurosis is large. Falco columbarius. - the radius is short, the corpus is wide and flat, - the tuberculum ulnare is clearly separated from the tuberculum aponeurosis. Falco tinnunculus: - the distal end of the bone is strongly curved in caudal direction (ventral view), its shape in caudal view is short, square, - the distal part of the tuberculum aponeurosis is thick, knobby, the tuberculum ulnare is hardly detectable. Falco vespertinus. - the corpus radii is strikingly thin, its cross-section is most cylindrical in this species, - the tuberculum aponeurosis is smaller, the tuberculum ulnare is clearly separated. Falco naumanni: - the corpus radii is thin, - the tuberculum aponeurosis is small. 28