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Epipompilus    Kohl comprises 52 species of wasps that are parasitoids of spiders; 16 species occur in the Neotropical region and 36 species occur in the Australian region. The biological knowledge of this genus is limited and its interactions and host spiders are still incipient. Here, we report some behavioural and biological characteristics of    E.   excelsus   , a parasitoid of the tube-dwelling spider    Ariadna   mollis   . We observed an    E.   excelsus    female attacking an adult female of    A.   mollis    in São Paulo, Brazil. We photographed daily the larval development of the wasp, from the egg stage to adult emergence. The entire developmental cycle of the wasp took 24 days. This period was shorter than the developmental periods of wasps belonging to other genera of   Pompilidae  . Although all species within   Pompilidae   use spiders as host, they present great behavioural diversity, characterized by different ethological sequences. In conclusion, this study demonstrated that the Neotropical species of    Epipompilus    exhibit biological characteristics similar to the Australian species, acting as a koinobiont ectoparasitoid, but displays differences in larval morphology. Studies on other species could elucidate the extent of these differences and similarities, contributing to our understanding of the evolutionary history of    Epipompilus   , and consequently of   Pompilidae  .

journal of hymenoptera research

First record of    Epipompilus   excelsus    (Bradley, 1944) (  Hymenoptera  ,   Pompilidae  ) as a koinobiont ectoparasitoid of    Ariadna   mollis    (Holmberg, 1876) (  Araneae  ,   Segestriidae  )