none Callophrys rubi; FOOD-PLANTS; Genista tinctoria & Lupinus polyphyllus; Plant alkaloids, elimination or use for defence, analysis & influences; EXCRETION-; Elimination of food plant derived alkaloids; HYMENOPTERAN-PARASITES; Distatrix sancus; New host record & effect on elimination of food plant derived alkaloids; GERMANY-; Bavaria, Wurzburg; Food plant alkaloids, elimination or use in defence, influences Distatrix sancus; LEPIDOPTERAN-HOSTS; Callophrys rubi; New host record & effect on elimination of food plant derived alkaloids; GERMANY-; Bavaria, Wurzburg; New lepidopteran host record & effect on elimination of alkaloids from host. Caterpillars of the lycaenid butterfly Callophrys rubi accept a variety of hostplants. When fed inflorescences or leaves of Genista tinctoria (a natural hostplant) or Lupinus polyphyllus (a non-host), the larvae completely eliminate quinolidizine alkaloids ingested from their food in their frass. No alkaloids are stored. Infestation by the parasitoid wasp Distatrix sancus (Braconidae) did not affect alkaloid elimination. The presence of an effective anti-toxin system is discussed with reference to the evolution of hostplant relationships in the genus Callophrys. There is no evidence that in the secondarily myrmecoxenous larvae of C. rubi hostplant-derived chemical defense takes the place of former myrmecophily.