Both sexes fully winged. Body almost white, forewings uniformly blackish brown; antennal segments II–VII increasingly brown. Head wider than long, with no sculpture lines; ocellar setae small, pair III arise lateral to ocellar triangle. Antennae 7-segmented; segments III–IV with sensorium forked in female but simple in male, segment VI inner margin with long sensorium arising close to base of segment, VII long. Pronotum with transverse sculpture lines and pair of stout transverse apodemes latero-medially; 4 pairs of posteromarginal setae, two pairs of long posteroangular setae. Metanotum with elongate reticulation, median pair of setae far behind anterior margin. Forewing first vein with two prominent setae on distal half, cilia arising close to anterior margin. Tergites with fine microtrichia on lateral sculpture lines; median pair of tergal setae longer than distance between their bases; posterior margin of VIII with complete comb; tergite X with no longitudinal split.
The genus Leucothrips includes five species, all from the New World. The genus is not clearly distinguished from the Neotropical genus Halmathrips, and is also closely related to Pseudodendrothrips. The sensoria on antennal segments III and IV vary between species and also between sexes, being either forked or simple, but all of the species have 7-segmented antennae.
Brazil, Australia, India, Europe, U.S.A.
Breeding on fronds
Adiantum sp., Davallia sp., Pteris cretica, Pteris argyraea, Hypolepis rugulosa
Minor damage to cultivated ferns