View Image Gallery of Tribe Dysphaniini

The genus Dysphania (with Cusuma Moore) exhibits a number of unique features. Both males and females have a fovea at the base of the forewing. It is situated at the base of the space between the anal vein and the position of the lost CuP vein and is associated with a concavity to the anal vein (Fig 1). It is relatively more basal than those of Ennominae (Holloway, 1993[4]) and Foveabathra (Foveabathra venusta Warren comb.n), and therefore probably not homologous. In these other groups occurs in the male only.

The antennae of both sexes are long, narrowly bipectinate, the pectinations tapering to the apex. The lack of sexual dimorphism is also seen in the strikingly aposematic wing markings: strongly maculate black or blue black on combinations of blue, bright yellow, orange or white.

The ansa of the tympanic bulla is robust, relatively short, T-shaped, lacking the central expansion of the typical geometrine (Cook & Scoble, and see Fig 11). The male third sternite has a central patch of setae, more elongate transversely (Fig 11 compared with Figs 238-243), but not the distinct comb that characterises the Ennominae.

In the male genitalia the vinculum is cruciform as in many Geometrini, and this is associated with strong coremata: in many ennomines, Sarcinodes and Eumelea, the presence of coremata is associated with a looping down of the vinculum on each side to accommodate them. The socii are vestigial, contrasting strongly with their elaboration in Geometrini. The valves are simple with the sacculus produced apically as a rather blunt harpe. The aedeagus resembles those of many Geometrini in being sclerotised strongly only in a relatively narrow ventral strip along its length, and the vesica is tubular, unornamented as in the majority of Geometrini.

The female genitalia lack a signum. The ovipositor lobes are not modified in the manner that appears to characterise most Geometrini (Geometrini).

The early stages require further study from a higher classificatory viewpoint. The eggs are more or less spherical. The smooth-skinned larva is aposematically coloured and has a defensive resting posture with the body held in arched posture, only the prolegs holding on to the substrate: the rounded head is curled round under the thorax in contact with the true legs, tucked under the metathoracic pair (Barlow, 1982: Prashanth et al., in prep.). The pupal cremaster has four pairs of robust hooks, relatively widely spaced. Further notes on the biology may be found below, with references to the literature.

The only included genus is found throughout the Indo-Australian tropics eastwards to the Solomons, where there are four endemic species.

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