Key to Scientific Names in Ornithology

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(Tyrannidae; Ϯ Flammulated Flycatcher D. flammulatus) Gr. δελτα delta  delta, the letter Δ (D); ῥυγχος rhunkhos  bill; "b2. Nostrils superior; width of bill at frontal feathers equal to length of gonys. (Tarsus much shorter than length of bill to rictus.) . . . . DELTARHYNCHUS.  ...  4. Deltarhynchus Ridgway.   Deltarhynchus RIDGW., MS.   Type, Myiarchus flammulatus LAWR." (Ridgway 1893).