none Meteoridea hutsoni (Nixon), which is a recently recorded larval-pupal braconid parasite of Opisina arenosella Walk., has a distribution limited to certain areas of Malabr, in Kerala. Observations on certain aspects of the biology and behaviour of this parasite are given. Females live longer than males: with 50% honey, females lived for 12.4 days whereas mates lived for 9.3 days. In the field males outnumber females, their ratio being 4 : 3. Total duration of life stages from egg to adult varies from 17 to 23 days. Reproduction; Reproductive behaviour; Mating; Life cycle and development; Development; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Host parasite relationships; Ecology; Population dynamics; Population structure; Land and freshwater zones; Oriental region Opisina arenosella (Xyloryctidae); Hymenopteran parasites; Meteoridea hutsoni; Parasite biology & prevalence; Prevalence; Meteoridea hutsoni (Hymenoptera); India; Kerala; Hymenopteran parasite biology & prevalence Meteoridea hutsoni (Braconidae); Parthenogenesis; Courtship; Copulation; Oviposition; Life cycle; Longevity; Lepidopteran hosts; Opisina arenosella; Biology & prevalence; Prevalence; Opisina arenosella (Lepidoptera); Population sex ratio; India; Kerala; Biology, distribution & prevalence, lepidopteran host