Separating Strumigenys rogeri from S. silvestrii and S. perplexa A S. rogeri head in profile indicating preocular notch (CASENT0135259, April Noble) B S. rogeri with anterior portion of eye detached from head (CASENT0179508, Erin Prado) C S. silvestrii displaying lack of preocular notch (FMNHINS0000078527, Gracen Brilmyer) D S. perplexa, lacking detached anterior portion of eye (ANTWEB1013916, Benoit Guénard). Pictures available from www.antweb.org.

 
 
  Part of: Hamer MT, Marquis AD, Guénard B (2021) Strumigenys perplexa (Smith, 1876) (Formicidae, Myrmicinae) a new exotic ant to Europe with establishment in Guernsey, Channel Islands. Journal of Hymenoptera Research 83: 101-124. https://doi.org/10.3897/jhr.83.66829