Abstract
The following new species of Onchocericidae (Nematoda: Filarioidea) are described from the American black-billed magpie, Pica pica hudsonia (Sabine, 1823): Splendidofilaria gicacardina , from the myocardium directly behind the aortic and pulmonary semilunar valves; Splendidofilaria caperata , from the walls of the pulmonary arteries; Chandlerella striatospicula , from the connective tissue around the splenic artery, esophagus, or in the mesenteries; and Eufilaria longicaudata , from the connective tissue around the esophagus. Microfilariae of all species occur in the blood.

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