father longlegs
Webster's Dictionary (GCIDE)
Daddy longlegs \Dad"dy long"legs`\
1.(Zool.) An arachnidan of the genus Phalangium, and allied genera, having a small body and four pairs of long legs; -- called also harvestman, carter, and grandfather longlegs. [1913 Webster]
2.(Zool.) A name applied to many species of dipterous insects of the genus Tipula, and allied genera, with slender bodies, and very long, slender legs; the crane fly; -- called also father longlegs. [1913 Webster]