Filate

a. Entom. [f. L. fīl-um thread + -ATE².] (See quots.)

1826.  Kirby & Sp., Entomol., IV. 294. Margin … Filate.… When the edge is separated by a channel, often producing a very slender threadlike margin. Ibid., IV. 324. Filate.… When inversatile antennæ have neither a terminal nor a lateral bristle.