In the words of Paul Whitngton's sawfly guide within his Southern Forests website. "P. affinis and P. dorsalis can only be reliably separated from then pattern and morphology of the hairs of the ovipositor valves. In P. affinis these hairs are very dense and fine with the tips of hairs not spooned, whereas in P. dorsalis there is a considerable distance between the hairs and the tips of hairs are spooned "
Yes this is a female but the ovipositor valve hairs not visible in this angle. If you have any other pics please add. Refer- https://southernforestlife.net/notes/2024/6/26/perga-species-identification