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Mambarilla Hering

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 submarginal.

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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