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Cyana costifimbria Walker
Bizone costifimbria Walker, 1862, J.
Linn. Soc. (Zool.), 6:121.
Chionaema rhadota Swinhoe, 1907, Ann. Mag nat. Hist.
(7), 20: 76, syn. n.
Chionaema javanica ab. niasensis Strand, 1922, Lep.
Cat., 26: 685, syn. n.
Chionaema rhadota borneensis Talbot, 1926, Sarawak
Mus. J., 3(2): 135, syn. n.
Cyana pectinata Roepke, [1946a]: Tijdschr. Ent. 87:
31, syn. n.
Cyana
costifimbria 
(approx.
lifesize)
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Cyana
costifimbria
(approx.
lifesize) |
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Diagnosis.
This species
shows extreme sexual dimorphism. Males are unmistakeable, with transverse broad
orange bands on the forewing (very rarely edged with some black) being disrupted
by a long and conspicuous fringe of scales extending back from the costa.
Females are like a small version of those of conclusa
or malayensis, but have the
postmedial black edge mostly straight, but angled obtusely towards the apex at
the costal end. The antemedial black edge meets the dorsum at an acute angle
basad as in malayensis rather than at
an obtuse one as in conclusa.
Taxonomic
note. The
marked sexual dimorphism has led to some confusion in the past in that both
sexes have been described more than once and rarely associated with each other
(see also C. determinata
Walker). A related species is C. vespertata
Cernư comb. n. from the Philippines; this shows similar sexual dimorphism,
but the male has black delineation of the fasciae. The group is distinguished by
a spur on the centre of the valve costa, a ridge between the two valve sections,
and general scobination of the aedeagus vesica, including two patches of longer
spines.
Geographical
range. Borneo,
Peninsular Malaysia, Sumatra, Nias, Java, Philippines (Palawan, Tawi Tawi).
Habitat
preference. The
species has a similar ecological range to determinata
(see Cyana determinata Walker) but is slightly commoner.
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