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A new nematode, Paracapillaroides agonostomi gen. et sp. n., is described from the stomach and the intestine of the mugilid Agonostomus monticola (Bancroft) from the Cuitzmala River (the Pacific Ocean basin), State of Jalisco, Mexico. This capillariid species represents a new genus similar to Paracapillaria Mendonca, 1963, differing from it substantially in the structure of the spicular sheath that is formed by two distinct parts, a broader and much shorter spinose proximal part and a narrower, very long aspinose distal part. Another capillariid, Paracapillaria teixeirafreitasi pacifica subsp. n. is described from the intestine of eleotrids Gobiomorus polylepis Ginsburg (type host) and G. maculatus (Gunther) from the same locality (Cuitzmala River, Jalisco). This subspecies is differentiated from P. teixeirafreitasi teixeirafreitasi (G. Caballero, 1971) by the absence of a pair of minute preanal papillae, by a considerably longer spicule (0.261 - 0.501 mm), a distinctly thicker egg wall, and by the geographical distribution (Pacific Ocean basin). P. teixeirafreitasi teixeirafreitasi is briefly described from specimens collected from Gobiomorus dormitor Lacepede from the Tecolutla River, Veracruz, Mexico.