Horistothrips Morgan

Two species from Australia are placed in this genus, together with three non-Australian species whose generic relationships remain in doubt. The type species, H. australiae (Fig. 24), lives under the bark of certain Eucalyptus trees in eastern Australia (Tree & Walter 2012), but H. platygaster is known only from a few specimens taken in the north of this continent (Mound 2008).

Diagnosis. Usually micropterous; head longer than wide, posterior half reticulate; postocular setae capitate; stylets retracted to eyes, close together medially; antennae 8-segmented, VIII broad at base, III with 1 sensorium, IV with 2 or 3 sensoria; pronotum with 5 pairs of capitate setae; notopleural sutures complete; basantra absent; mesopraesternum reduced to two lateral triangles; sternopleural sutures long; both sexes with fore tarsal tooth; pelta triangular; tergites II–VII each with 2 pairs of wing retaining setae; tube shorter than head, anal setae much longer than tube; male sternite VIII with large pore plate.