Key to Scientific Names in Ornithology

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(Tyrannidae; Ϯ Northern Bentbill O. cinereigulare) Gr. ογκος onkos  bulk, weight; στομα stoma, στοματος stomatos  mouth; "98. TODIROSTRUM CINEREIGULARE, sp. nov.  ...  rostro compressiusculo, crassiusculo; culmen carinato, incurvo  ...  This Todirostrum differs slightly in the form of the bill from the ordinary members of the genus, that part being rather thicker, and with the culmen elevated and more incurved than in the typical species of the group." (P. Sclater 1856); "Genus ONCOSTOMA.   1269. ONCOSTOMA CINEREIGULARE.  Todirostrum cinereigulare, Sclater, P.Z.S. 1856, p. 295." (P. Sclater 1862); "Oncostoma Sclater, 1862, Cat. Coll. Amer. Birds, p. 208. Type, by monotypy, Todirostrum cinereigulare Sclater." (Traylor in Peters 1979, VIII, 78).