Requested reference
Helsdingen, P. J. van (1986b). Discrimination between Xysticus luctuosus (Blackwall) and X. acerbus Thorell (Araneae, Thomisidae). Mémoires de la Société Royal Belge d'Entomologie 33: 85-92. -- Show included taxa
Helsdingen, P. J. van (1986b). Discrimination between Xysticus luctuosus (Blackwall) and X. acerbus Thorell (Araneae, Thomisidae). Mémoires de la Société Royal Belge d'Entomologie 33: 85-92. -- Show included taxa