Stomothrips Okajima

Known only from northern Australia, this genus comprises two species, S. cycasi and S. mouldeni, both of which were collected from the fronds of Cycas species that apparently were affected by fungus. These two thrips both have the mouth-cone very long, but in cycasi this is directed posteriorly, whereas in mouldeni it is directed downwards and thus appears shorter in dorsal view (Figs 39, 43).

Diagnosis. Head much longer than wide; postocular setae long, capitate; mouth-cone long, stylets retracted to eyes, close together medially; antennae 8-segmented, III with 1 sensorium, IV with 2 sensoria; pronotum with 5 pairs of capitate setae; notopleural sutures complete; basantra present; mesopraesternum transverse, slender or divided; no sternopleural sutures; fore tarsi without tooth; wings weakly constricted medially, without duplicated cilia; pelta hat-shaped; tergites II–VII each with 2 pairs of wing retaining setae; tube much shorter than head, anal setae about as long as tube; male sternite VIII without pore plate.