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Bastilla Swinhoe

Type species: redunca Swinhoe = hamatilis Guenée, Australasian tropics.

Naxia Guenée (type species absentimacula Guenée, Java) praeocc.; Xiana Nye (replacement name for Naxia).

This genus now contains probably the bulk of the old Indo-Australian “Parallelia”, also a major group in Africa referred to Caranilla Moore by Berio, (1965a, 1978), and possibly some New World species (Holloway & Miller, 2003). The Indo-Australian fauna also falls into a number of groupings, such as the moviana Stoll group studied in particular detail by Holloway & Miller, but also one that includes the last three Bornean species described below, crameri Moore group; the two Bornean members of the joviana group are treated first.

Bastilla species mostly have a more contrasted forewing facies, with the trapezoidal mark and the area between the medial and postmedial fasciae conspicuously darker. The genus is best defined by the male genitalia which combine bilateral symmetry with double or even treble coremata on the valves. The uncus is usually simple, though a superuncus occurs in most African species and in the crameri group. The costal and saccular valve processes are well separated in Achaea, the latter slender, rod-like. The costal process is usually long, with distal expansion and / or ornamentation. The juxta is often short, broad, often somewhat H-shaped. The aedeagus is curved (strongly angled in the crameri group); the vesica is variable in shape but the diverticula usually bear some robust spines or cornuti, sometimes in groups.

The female genitalia offer no clear generic features, though the antevaginal plate is always well developed; in the
crameri group it is completely divided into two tongue-like lobes that flank the ostium.

The larvae of several species are described below. The pupa always has a powdery bloom. Host records are predominantly (but not exclusively) from the Euphorbiaceae, particularly
Phyllanthus (Holloway & Miller, 2003).

B. simillima Guenée (India to Sumatra) was assigned by Holloway & Miller (2003) to the major African group of the genus. Bell (MS) noted that the larva lacked prolegs on both A3 and A4 and is thus atypical within the Indo-Australian fauna. It does, however, feed on Phyllanthus.

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