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Zeuzera Latreille

Type species: aesculi Linnaeus ( = pyrina Linnaeus)
Synonyms: Aegolia Billberg; Latagia Hubner.

The wing venation is illustrated in Fig.4. below. The forewing pattern is of iridescent black striae or spots on a white or greyish ground, somewhat translucent. The hindwings are less spotted, sometimes immaculate except for marginal spots which are usually heaviest and often fused together over an excavate zone between the cubital and anal veins; this excavate zone is more pronounced than in Xyleutes.

The thorax and abdomen are greyish white, spotted and/or banded regularly in black, the thorax usually with three pairs of spots, a diagnostic feature for the genus. Another feature is the association of hindwing vein Sc with the cell (Fig. 4). 

Figure 4. Venation of Zeuzera lineata

The male genitalia, especially the apical ornamentation of the aedeagus, are similar to those of Xyleutes. The worldwide diversity of the latter and the great variety in wing facies of the species suggests that Zeuzera may well be merely a well-defined section of Xyleutes rather than the sister-genus; Xyleutes as constituted at present would then be paraphyletic.

The facies characters of the wings and thorax mentioned above would restrict application of the generic name to Holarctic and Indo-Australian taxa, excluding the few New World species such as ramosa Schaus and comisteon Schaus that have been included in the genus in the past but are now placed in Hamilcara Barnes & McDunnough.

The larva appears to be distinguished from those of Xyleutes by a much narrower zone of rugosity on the posterior of the pronotum and a fivefold lobing of its anterior margin (Gardner 1945). Gardner was only able to examine two species of Xyleutes, ceramica and persona.

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