Monoctenus sanchezi Smith, n. sp., is described. It was found damaging Juniperus flaccida Schlechtendal (Cupressaceae) in San Luis Potosí, Mexico. This is the second Mexican species of the genus. A review of Monoctenus from southwestern United States, Mexico, and Central America is presented, with M. sadadus Smith a new country record for the United States and new records of the genus for Utah and as far south as Guatemala.
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Arizona
Durango
Guatemala
juniper
sawfly
Utah