_Nesting sites._--Holes in walls; holes in banyan and fig trees; in houses in drawers and cartons. _Behavior._--Similar to that of _A. assimilis_. Bordage (1912) gives a complete description of capture of prey. The female wasp cuts off part of the cockroach's antennae, legs, and wings; she sticks her egg onto the host's mesothoracic coxa. The wasp frequents houses in search of prey. Five [F][F], supplied with a cockroach per day, stored an average of 57±14 cockroaches; 8 [F][F] stored an average of 45±3 cockroaches; these latter wasps were not supplied with a cockroach per day throughout (mean values computed from Williams, 1942). This wasp will not attack _Nauphoeta cinerea_ (Williams, 1942a) or _Pycnoscelus surinamensis_ (Schwabe, 1950b). On one occasion, _A. compressa_ stung _Diploptera punctata_, but did not oviposit (Williams, 1942a). _Development._--Minimum 34 days, maximum 140 days (Williams, 1942). About 6 weeks (Swezey, 1944). _Longevity of adults._--13 [F][F] lived an average of 110±11 days (minimum 31, maximum 159); several [M][M] lived 2 months (Williams, 1942). =Ampulex fasciata= Jurine _Natural host._--_Ectobius pallidus_, France (Picard, 1911, 1919): Nesting sites are in brier or bramble stems, or in crevices in fig trees; the female possibly uses old nests of leaf-cutter bees. The feeding of the wasp larva is similar to that of other _Ampulex_. Adult wasp emerges by cutting open a passage through its cocoon and through the anus of the cockroach. =Ampulex ruficornis= (Cameron) _Natural hosts._--Cockroaches, Oriental region (Rothney _in_ Sharp, 1899): Nesting sites are in crevices in bark. The female grasps the cockroach by an antenna to drag it to her nest. =Ampulex sibirica= Fabricius _Synonymy._--Perkins referred to this species as _Ampulex sibirica_. Williams (1942a), referring to Perkins's observations, mentions the species as "_A. compressiventris_ Guérin (=_A. siberica_ Sauss.)." Krombein (personal communication, 1956) has commented upon this synonymy as follows: _Ampulex siberica_ Sauss. is apparently a misidentification by Saussure of _sibirica_ Fab. Kohl (1893) in his revision of the genus _Ampulex_ considered _A. compressiventris_ Guérin to be the correct name for this common African species and that _sibirica_, described from Siberia, must be another species. However, Turner (1912) stated that he had seen Fabricius's type specimen and that it was identical with what had been called _compressiventris_; he considered the Siberian locality given by Fabricius as an error. Krombein suggested that Williams's use of the combination _siberica_ Sauss. was a lapsus and that the valid name, if Turner is correct, is _sibirica_ Fab. _Natural hosts._--Cockroaches, West Africa (Perkins _in_ Sharp, 1899): Nesting sites are keyholes. Enters apartments in search of cockroaches. Wasp cocoon protrudes from dead body of cockroach. =Ampulex sonnerati= Kohl _Synonymy._--"La mouche bleue" of Sonnerat (Kohl, 1893).