Type species: spatulifimbria Hering.
The venation of the rather deep forewings and the curvature of the palps are
typical of the Narosa group of genera. The antennae are broadly
bipectinate over the basal two thirds and weakly so over the distal third. The
forewings are pinkish or pale ochreous red with a faint, fine, darker
In the male genitalia the saccus is well developed and the valves have a
strong, somewhat bulging sacculus. In the female the bursa and ductus are very
weak, relatively short, and there is no signum.
Mambarilla spatulifimbria (t. loc. Bombay, India) is either closely related to,
or a junior synonym of, Contheyla rotunda Hampson (t. loc. Karwar,
India). Therefore the latter is hereby transferred to Mambarilla comb. n.
Bell (MS) described the early stages of rotunda. The egg is flat,
irregularly circular, somewhat thickened in the middle, white, becoming
yellowish. The larva is of peculiar shape, centrally swollen, narrower
posteriorly than anteriorly with abdominal (A) segment 9 bifurcating into
two posterior tubercles; lateral tubercles occur on A8 and slightly on
A7. Thoracic segment 2 is broad, giving a square anterior viewed from above,
with four short, thick, semiovoid tubercles along the front margin which
overhangs the head and T1. The head is round, shining, oily yellow. The body
surface is dull, each segment except T1 with a supraspiracular, oval, raised,
tubercle-like spot which is only expanded on the segments indicated above; A2 is
humped dorsally and there are dorsolateral tubercular marks also. The body is
chocolate brown with the hump of A2 greenish or yellow- green. There are lateral
green spots on A3 and sometimes one dorsally on A7. The sides of A7 and A8 are
light yellow and the ventrum is greenish.
The larva feeds on Cocos, on the undersides of the pinnae. At
rest it assumes different shapes by expanding and contracting various segments.
There is one species in Borneo tentatively assigned to the genus and
described as new below.
Rhamnosa plumbifusa Hampson (Khasis) may also be referable to this genus
but, though the facies of the forewings is similar, the saccus is not developed;
in the female the ductus is centrally sclerotised and the bursa has a signum.
Typical Rhamnosa Fixsen species are characterised by a forewing facies
akin to that of Cania females and a produced angle to the centre of the
forewing dorsum. Mambarilla narosides Hering may be a synonym of plumbifusa.
Spatulifimbria Hampson females have similar facies but have normal rather than Narosa-like venation.
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