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I really don't think you would need specific temperatures and relative humidity to rear these - the species is very widespread and must have a wide range of tolerances. The key will be to give them the appropriate aphids. Although they have only been reared from a handful of aphid species (Aphis chloris, A. craccivora, A. gossypii, A. spiraecola, Macrosiphum rosae, Myzus persicae), they may have a wider host range, especially if given a no choice situation.