Key to Scientific Names in Ornithology
(Tyrannidae; Ϯ Agile Tit Tyrant U. agilis) Gr. ουρα oura tail; Mod. L. myias flycatcher < Gr. μυια muia, μυιας muias fly; πιαζω piazō to seize; "Uromyias genus nov. Nearly related to Spizitornis, but bill much shorter, wider and more depressed; rictal bristles much more developed; crest feathers on apical portion neither attenuated nor decurved; tail proportionately longer and strongly graduated, the distance between the shortest and longest rectrix being at least equal to length of tarsus; rectrices conspicuously pointed at the tip instead of bluntly rounded. Type Euscarthmus agilis SCLATER" (Hellmayr 1927).