Euconosia aspersa Walker
aspersa Walker, 1862, J. Linn. Soc. (Zool.), 6:104 (partim).
and the next two species are very similar externally, xylinoides having a
stronger angled fascia on the forewing, and obscuriventris having darker
shading to the forewing, particularly in the female. The species are best
distinguished on genitalic features. In the male, the aedeagus lacks a cornutus
at the apex of the main part of the vesica, and the upper part of the valve has
a fringe of short hairs that runs from the apex of the dorsal portion down its
ventral margin to the bottom of the cleft separating it from the narrower
ventral portion. The hairs are denser than in xylinoides. In the female,
there is a sclerotised plate in the ductus and another in the neck of the bursa,
the former being present and the latter absent in xylinoides, where the
neck of the bursa is more generally thickened. There are scobinate signa at one
third and two thirds in the corpus bursae, the more basal being larger; in xylinoides
they are equal in size.
Taxonomic note. The
original material consists of single male and female syntypes. The female (slide
4688) is hereby designated Lectotype, because the male (slide 5101) is a
specimen of xylinoides.
Geographical range. Borneo,
Bali (slides 5102, 5118).
Habitat preference. Three
specimens were taken in alluvial forest, including regenerating forest, during
the Mulu survey, and two in Brunei in coastal forest at Seria. It may be the
species most characteristic of disturbed forest.
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