Stag beetles of the genus Dorcus MacLeay in North America (Coleoptera, Lucanidae) Author Paulsen, M. J. University of Nebraska State Museum, Lincoln, United States of America text ZooKeys 2010 2010-01-28 34 34 199 207 journal article 10.3897/zookeys.34.292 e4793122-9b59-4473-9912-18d50e3db61c 1313–2970 576613 49601E51-1B57-4176-8A18-50B6CA622B40 Dorcus mexicanus Examination of the type specimens of D. mexicanus revealed that they are Dorcus parallelipipedus (L.), a Palearctic species. The identical male genitalia (Fig. 11), protruding clypeus of males, irregularly punctate elytra, and bituberculate frons of the female provide overwhelming evidence to support this conclusion. Thus, the name D. mexicanus Benesh is here reduced to a synonym of D. parallelipipedus (new synonymy). Coincidentally, I encountered a second pair of D. parallelipipedus recently accessioned at the FMNH that bore handwritten labels indicating “ Mexico , Nuevo Leon , Monterey (sic), Aug 1976 ”. The presence of a second, more recent pair of D. parallelipipedus from Mexico at first suggested that the species might be introduced there. However, on further examination I found that other handwritten locality labels of the same style from the accessioned collection were erroneous (with incorrect countries). While it is not impossible that the species is adventive in Mexico , it is more likely given the nomenclatural history of Dorcus that the common D. parallelipipedus has been mislabeled in these two instances.