From ZooTerms (Dictionary of Invertebrate Zoology)
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falces (noun, plural; singular falx, falcis; Latin falx, sickle): 1. (Arthropoda: Chelicerata) Falces used to denote chelicerae of ticks; chelicerae of certain arachnids.

2. (Arthropoda: Insecta) In lycanid butterflies, when present, paired, sclerotized, curved arms articulated with the caudal margin of the tegumen ventrad of the uncus, and extending ventro-caudad.