From ZooTerms (Dictionary of Invertebrate Zoology)
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lacinia also lacinea (noun; plural laciniae; Latin lacinia, flap): 1. (Arthropoda: Crustacea) The inner distal spiny lobe of the second segment of the maxillula.

2. (Arthropoda: Insecta) a. In many, the inner lobe (elongate jaw-like structure) of the maxilla, located at the apex of the stipes. b. In Psocidae, represented by a hard elongate rod, slightly bifurcated at its free end and ensheathed by the galea, sometimes called the pick; similar modification to a stylet-like shape in Mallophaga.