Separating Strumigneys perplexa and S. silvestrii A Strumigenys perplexa with ventral petiole spongiform strip indicated (ANTWEB1013915, Benoit Guénard) B S. perplexa showing all scape hairs curved toward apex (ANTWEB1013915, Benoit Guénard) C S. silvestrii indicating lack of ventral petiole spongiform tissue (FMNHINS0000078527, Gracen Brilmyer) D S. silvestrii with 2 or more hairs directed toward scape base (FMNHINS0000078527, Gracen Brilmyer). 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