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

Summary Falco subbuteo: - the ulna is robust: the corpus is thick, the ends of the bone are large, - the corpus ulnae is strongly widening towards the proximal end both in ventral and cranial view, - the longitudinal axis of the ulna is strongly curved (ventral view). Falco columbarius: - the ulna is short, the corpus is thick, the ends of the bone are relatively large, - the corpus ulnae is not widening towards the proximal end in ventral view, - the longitudinal axis of the ulna is most curved in this species (ventral view), - the olecranon is large, - the distal end of the bone (at the labrum condyli) is widest in dorso-ventral direction in this species, - the edge of labrum condyli is connected to the corpus ulnae abruptly (caudal view). Falco eleonorae: - the ulna is very long, the corpus is thick, - the distal end of the bone is relatively small. Falco tinnunculus: - the corpus ulnae is thin, - the corpus is the most widening among the Kestrels towards the proximal end in cranial view, - the proximal end of the bone is widest among the Kestrels in this species (PW). Falco vespertinus: - the corpus ulnae is thin, - the corpus is the least widening towards the proximal end in cranial view, - the longitudinal axis of the ulna is least curved in this species (ventral view). - the distal end of the bone (at the labrum condyli) is the narrowest in dorso-ventral direction in this species, - the edge of labrum condyli is connected to the corpus ulnae in an arch, very smoothly (caudal view), Falco naumanni: - the ends of he bone are small, the corpus ulnae is relatively the thickest among the Kestrels, - the longitudinal axis of the ulna is less curved in this species, similar to the Red-footed Falcon (ventral view). Carpometacarpus The carpometacarpus of the Hobby and Merlin compared to the former bones is longer than in the Kestrels. This is shown by the fact that the scatter of the length measurements of the Kestrels overlaps less with the Hobby and more with the Merlin (Plate XVI, Figure 1). Hence the carpometacarpus of the Hobby can be separated from that of the Red-footed Falcon by its length, and separates from that of the Lesser Kestrel as well. Only the large females of the Merlin overlap with the small males of the Hobby. All the measured Lesser Kestrel individuals are within the size range of the Red-footed Falcon. In the Hobby and Merlin the sexes are well separated as regards to their carpometacarpus length. The only measured Eleonora's Falcon specimen has considerably greater GL value (44.0 mm) than the Hobby. 30