A bobcat was found recently killed on "Highway 101" near the town of San Fernando, Tamaulipas State, Mexico (100 km south of Brownsville, TX, U.S.A.). The cat (Lynx rufus texensis) was parasitized by several species of nematodes and trematodes, but mainly by a cestode, Echinococcus oligarthrus. The diagnostic characteristics of this cestode are described and illustrated. E. oligarthrus has not been reported previously in North America. This is the first time that the strobilar stage has been recovered from a "bobcat". A potential public health problem may be raised by the presence of this cestode in Mexico.