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Populations n l the four species of (Xloiiona commonly found i n thr Netherlands (:, dorsnta. (.:,q/aucrJrunr. C. J?izai&i/a and C. i'asroriircr -\vere cultured in thc laboratory nn t'tiqmit~.! aiotmlis, their exclusive host p l a n t in thc field. The low frequency substratr-transmitted signals produced during the calling phase of mating hchaviour \vcre digitally analyscd for the ni;iles and lemalcs of each species. Variables s r l e r t e d to cover most aspcrts nf tlic rall \+err measured, and variatinn was q i~~i~i t i f c d \vithin species and statistically tested uniiing species iising univariatca and multivariate techniques. Tlic calls of the nidcs \\ere inore complex in structure than thosc of the f;*rnalea, with two dilIerent phase patterns recognizcd, and wcrc species-specific. C. glaumrms and C: iotrmirn wrre also separated on variables o l the kmalc call, I)ut C. dorsnta and C. unarngdtiln cumplctcly ~~vcrlappcd. No sigiitic;int diftercnccs were h i n d bet\veen the c:ills of the long-\\inged and . h r twinged feinalc moi-phs of C. siiiarqdii/a. pnasible rolv for v;iriatiiin in calling signals. and [responses to thcm, in the evolution and maintcnancc of rcproductivc isolation in C%liii7uiin is discussed.