Abstract
Although morphologically indistinguishable as fundatrices and living together on the same tree of Crataegus oxyacantha L. or Mespilus germanica L., Ovatus crataegarius (WALKER) and O. insitus (WALKER) are reproductively isolated. Apparently there exists any difference in sex pheromone production by the oviparous females because those of O. insitus bear on the hind tibiae much more pseudosensoriae than in the other species. Emigrantes of O. crataegarius settle without exception Mentha spp. whereas the secondary host of O. insitus is Lycopus europaeus L. The year cycle of both species has been examined in a field insectary.
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