Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Andrŏgĕōn, ōnis, m., i. q. Androgeos; acc. Gr. Androgeona, Prop. 2, 1, 62.
Hence, Andrŏgĕōnēus, a, um, adj., pertaining to Androgeon: caedis, Cat. 64, 77.