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

- the crista trochanteris is small, on the cranial side a little bit less curved (lateral view), - the collum femoris on the proximal margin is not curved, - the axis of caput femoris and collum femoris is sharp angled to the longitudinal axis of the femur, the proximal end of the bone deviates into medial direction (cranial view), - the medial crista of trochlea patellaris is a lot higher than the lateral crista (distal view), - the cristae of trochlea patellaris are long. Falco eleonorae: - the femur is relatively short and the ends of the bones are thick (PW, DW), - the crista trochanteris is lower, on the cranial side a little bit less curved, - the axis of caput femoris and collum femoris is perpendicular to the longitudinal axis of the femur (cranial view), - the medial crista of trochlea patellaris is a lot higher than the lateral crista (distal view). Falco tinnunculus: - the femur is long, - the longitudinal axis of the femur is strongly curved, especially so on the distal part (lateral view), - the corpus femoris towards the ends of the bone (mainly towards the proximal end) is getting thicker abruptly (cranial view), - the crista trochanteris is high, shaped as a curve (lateral view), - the axis of caput femoris and collum femoris is obtuse-angled to the longitudinal axis of the femur (cranial view), - the tuberculum at the proximal end of the linea intermuscularis cranialis is small and pointed (proximal view), - the medial crista of trochlea patellaris is only a bit higher than the lateral crista (distal view), - the cristae of trochlea patellaris are short. Falco vespertinus: - the femur is very short, and the transverse measurements are also low, - the longitudinal axis of the femur is almost curved at all (lateral view), - the corpus femoris towards the ends of the bone is getting thicker only to a small extent (cranial view), - the axis of caput femoris and collum femoris is obtuse-angled to the longitudinal axis of the femur (cranial view), - the medial crista of trochlea patellaris is only a bit higher than the lateral crista (distal view), - the cristae of trochlea patellaris are short, - the sulcus patellaris is shallow. Falco naumanni: - the femur is very short, the transverse measurements are relatively higher than in the Red-footed Falcon, - the crista trochanteris is relatively high, shaped as a curve (lateral view), - the axis of caput femoris and collum femoris is obtuse-angled to the longitudinal axis of the femur (cranial view), - the medial crista of trochlea patellaris is only a bit higher than the lateral crista (distal view), - the cristae of trochlea patellaris are short, - the sulcus patellaris is shallow. 44