none Cochylis roseana; Endothenia gentianaeana; SIZE-; Ovipositor & larval head capsule; FOOD-PLANTS; Dipsacus fullonum (wild teasel); Biology; EGG-; Morphology & size; OVIPOSITOR-; Length; EGG-LAYING; Oviposition; LIFE-CYCLE; Life history; EMERGENCE-; Seasonal study; DIURNAL-ACTIVITY; HYMENOPTERAN-PARASITES; Records; ENGLAND-; Cambridgeshire; Biology on food plant Ascogaster dispar; Hyssopus nigritulus; LEPIDOPTERAN-HOSTS; Tortricidae; Records; ENGLAND-; Cambridgeshire; Lepidopteran host records The life histories of Cochylis roseana and Endothenia gentianaeana are described, amending and augmenting available published information, based on a study in Cambridgeshire between 1989 and 1992. The eggs and oviposition of both species are described in detail, and aspects of larval and adult biology considered. Adults emerge in early summer, E. gentianaeana a little before C. roseana, and both species are active around dusk. Eggs are laid onto young Dipsacus fullonum flowerheads. C. roseana conceals imbricate groups of 3-10 eggs between the bracts at the base of the host flowerhead, whilst E. gentianaeana lays eggs singly close to the tips of the receptacular bracts. These ovipositional sites reflect morphological differences between the species, the ovipositor of C. roseana being long and retractile and that of E. gentianaeana being much shorter. C. roseana larvae are gregarious seed-feeders, although the earliest of the four larval instars might feed within the florets initially. E. gentianaeana is confined to one larva per host flowerhead, feeding within the central cavity of the capitulum. Both species overwinter and pupate in the larval habitation. The principal parasitoids attacking these tortricids on the study site were identified as Hyssopus nigritulus (Hymenoptera: Eulophidae) for C. roseana, and Ascogaster dispar (Hymenoptera: Braconidae) for E. gentianaeana. Evidence of a small second generation of E. gentianaeana adults in a single summer was found in 1990 and 1992.