Subgenus NISUS, Cuvier.
- Accipiter, Brisson, 1760.[81]
- Nisus, Cuvier, 1799. (Type, Falco nisus, Linn.; A. fringillarius (Ray), Kaup.)
- Jerax, Leach, 1816. (Same type.)
- Cooperastur, Bonap. 1854. (Type, Accipiter cooperi, Bonap.)
- Hieraspiza, 1844, Jeraspiza, 1851, and Teraspiza, 1867, Kaup. (Type, Falco tinus, Lath.)
- Hieracospiza, Agass. (Same type.)
- Urospiza, 1845, Urospizia, 1848, and Uraspiza, 1867, Kaup. (Type, Sparvius cirrhocephalus, Vieill.)
- Erythrospiza, Kaup, 1867. (Type, A. trinotatus (Temm.?))
- Micronisus, Gray, 1840. (Type, Falco gabar, Daud.)
- Nisastur, Blas. 1844. (Same type.)
10759, ♂. NAT. SIZE
Nisus fuscus.
26588, ♀. ½
26588, ♀. ½
Nisus cooperi.