Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
longĭpēs, pĕdis, adj. [longus-pes], longfooted: simillimum scarabeo longipedi, Plin. 30, 4, 10, § 30: longipedes porrectis ad caudam cruribus volant, id. 11, 47, 107, § 257.