Gargetta costigeroides sp. n.
25 mm. The facies is as
illustrated, the forewing being very similar to that of costigera Walker
and differing from that of hampsoni in being broader, with a black discal
streak and greater variegation and speckling distally. The male genitalia have
the long, ampullate gnathal processes of costigera but the uncal
processes are broad and rounded rather than acute (or spined) and asymmetric.
The harpe on the valve is single rather than bilobed.
Holotype BRUNEI: Ulu Temburong
Expedition 1978, Base Camp [Lower Temburong] 350 m, MV light, 25. x. 1978 (T.
W. Harman), BM notodontid slide 1182.
Geographical range. Borneo, only known from holotype.
Biology. The life history is unknown but possibly similar to that of costigera
Walker (Bell MS). The larva is of typical Gargetta type with a resting
posture and behaviour on alarm as in the previous species. It walks in a
‘semi-looper’ manner. The head is distinctly bilobed, squarish, light greyish-brown,
speckled with black. The body is light brown with thin, paler, but dark-edged
bands. The second abdominal segment and, to a lesser extent, the eighth, bears a
transverse, spindle-shaped protruberance which has yellow-centred black spots
at its extremities. Another variant was greyer with black bordered yellow bands
and with pink extremities to the 'spindles'. Pupation is in a silken cell in the
earth or in leaf litter. The larvae are often heavily parasitised.
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