(syn. Picoides Ϯ Three-toed Woodpecker P. tridactylus) Gr. τριδακτυλος tridaktulos three-toed < τρι- tri- three- < τρεις treis, τρια tria three; δακτυλος daktulos toe; "TRIDACTYLIA. ... Feet with only three toes, placed two before and one behind. WE have separated this genus from Picus on account of the number of toes, this having but threee, whereas the genuine Pici are all furnished with four, as already mentioned in our generic character. DOWNY TRIDACTYLIA. (Tridactylia hirsuta.) ... Picus hirsutus. Vieil. Ois. de L'Amer. Sept. 2. 68. Picus tridactylis. Lin. Syst. Nat. I. 177. 21. ... Three-toed Woodpecker. Edw. 114" (Stephens 1815).