none Biometrics; General morphology; Feeding; Carnivorous feeding; Reproduction; Life cycle and development; Life cycle; Developmental stages; Development; Behaviour; Social behaviour; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Ecology; Population dynamics; Population structure; Habitat; Terrestrial habitat; Abiotic factors; Physical factors; Land and freshwater zones; Palaearctic region; Europe Bradysia confinis (Sciaridae); Size; Developmental stages; General morphology; Adult description; Predation; Reproduction; General account; Larva; Development, growth & size in deciduous litter; Nymph; Morphology & size; Pupa; Morphology; Growth; Larvae; Metamorphosis; Pupation in deciduous litter; Aggregating behaviour; Larvae & nymphs; Hymenopteran parasites; Conostigmus alutaceus & Stenomacrus laricis; Mortality; Causative factors; Age class distribution; Developmental stage frequencies; Population sex ratio; Larval clusters; Litter habitat; Deciduous, biology; Climate and weather; Mortality relationships, deciduous litter; France; Brittany; Biology in deciduous litter Conostigmus alutaceus (Ichneumonidae NOT!); France; Brittany; Dipteran host mortality relationship, deciduous litter Stenomacrus laricis (Ichneumonidae); Dipteran hosts; Bradysia confinis; Host mortality relationship; Litter habitat; France; Brittany; Dipteran host mortality relationship, deciduous litter Conostigmus alutaceus (Megaspilidae); Dipteran hosts; Bradysia confinis; Host mortality relationship, deciduous litter; Litter habitat; Dipteran host mortality relationship; France