Omus dejeanii Reiche. The Greater Night-stalking Tiger Beetle is one of the few species-group taxa currently recognized in the genus Omus although over one hundred taxa have been described, particularly by Thomas Casey. Even today, taxonomists do not agree on the number of valid taxa that should be recognized in Omus. The difficulty of defining the species-group taxa is not unusual among old, apterous carabid lineages because they tend to form small, local populations.
Yves Bousquet
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Bousquet Y (2012) Catalogue of Geadephaga (Coleoptera: Adephaga) of America, north of Mexico. ZooKeys 245: 1-1722. <a href="//doi.org/10.3897/zookeys.245.3416" class="extiw" title="doi:10.3897/zookeys.245.3416">doi:10.3897/zookeys.245.3416</a>