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

The tuberculum supracondylare dorsale in the Hobby is usually larger than in the Merlin, and in the Red-footed Falcon larger than in the Kestrel. At the ventral edge of the fossa musculi brachialis in the Red-footed Falcon the depression is more hollow than in the Kestrel. Summary Falco subbuteo: - the humerus is robust, the corpus is thick, - the crista pectoralis is very large, the crista bicipitalis is also large, - the processus flexorius and the condylus dorsalis are large, - the tuberculum supracondylare dorsale is relatively large. Falco columbarius: - the humerus is strikingly short, - the double curve of the longitudinal axis of the corpus humeri is strongest in this species (caudal view), - the crista pectoralis is very large, but short in distal direction. Falco eleonorae. - the humerus is strikingly long, the ends of the bones are large, - the crista pectoralis is large, but not connected with the corpus on a long section. Falco tinnunculus: - the curve in longitudinal axis of the corpus humeri is strong in this species in caudal view, - the tuberculum supracondylare dorsale is small, - the fossa musculi brachialis is shallow. Falco vespertinus: - the corpus humeri is thin, the longitudinal axis of the corpus humeri is only slightly curved in this species in caudal view. - the crista pectoralis and crista bicipitalis are small, and the latter is distally short, - the condylus dorsalis is small, - the tuberculum supracondylare dorsale is relatively large. Falco naumanni: - the humerus is relatively long, the corpus is thin, - the crista pectoralis is smallest in this species. Radius Regarding its length the radius of the Hobby and Kestrel is placed in the same range. Considerably smaller in the Merlin, the size of the former species is only reached by the larger female specimens. The radius of the male Merlin is even shorter than that of the Lesser Kestrel. The size range of the Red-footed Falcon do overlap with all the other species. In the Hobby and Merlin the sexes are clearly separated, their size follows each-other (the males are smaller, Plate XII, Figure 1). The corpus radii is thickest in the Hobby (I had no data on the Eleonora's Falcon). But the ratio of the thickness proportional to the length of the radius (GL/CW), is lowest in the Merlin, and hence relatively the radius is the thickest in this species. In the Kestrels the corpus radii is considerably thinner. In the Red-footed Falcon especially the distal section is thinner than in the Kestrel (caudal view). The measurements of the ends of the bones (SP, GP, DW) in the Hobby are especially 27