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Butterflies of Thailand, Malaysia & Borneo
Dark Yellow-banded Flat
Celaenorrhinus cameroni   DEVYATKIN, 1998
Family - HESPERIIDAE
subfamily - PYRGINAE
Tribe -
Celaenorrhinus cameroni, Ringlet, Cameron Highlands, West Malaysia  Adrian Hoskins
Introduction
Butterflies in the genus Celaenorrhinus are known as 'flats' due to their habit of resting with their wings outspread and flattened against a leaf or other substrate. Many of the species have a pattern of hyaline 'windows' in the forewings, and some such as the beautiful African species galenus are marked with bands or blotches of almost luminous golden-orange.
The genus is widespread in tropical and subtropical regions of the world, with 24 species found in the neotropics including 5 which reach as far north as Mexico; 45 species in Africa, and 51 species in the Oriental region including 11 found on peninsular Malaysia.
Celaenorrhinus aurivittatus a localised but not particularly uncommon species which is found from Assam and Myanmar to Thailand, Malaya, Laos, Vietnam and south China. Until recently cameroni was considered to be a subspecies of aurivittatus, but it was separated by Devyatkin in 1998 and is now considered to be a full species. It appears to be restricted to the hill forests of Thailand and West Malaysia.
Habitats
Celaenorrhinus cameroni is found in open areas within temperate and subtropical humid forests at altitudes between about 400-1200m.
Lifecycle
I have no data relating to aurivittatus or cameroni but the following is applicable to the genus Celaenorrhinus in general :
The eggs are typically large, dome-shaped, greenish in colour, and laid singly on the underside of leaves of trees and shrubs in the family Acanthaceae, including Asystasia, Ecbolium, Eranthemum, Nilgirianthus, Carvia and Thelepapale.
After hatching the caterpillar eats its eggshell and then constructs a cell made from folding over a piece of leaf and fastening it with silk. After each moult it constructs a new cell, and when larger it uses a pair of leaves sealed together with numerous silk strands. It lives and feeds within these cells for it's entire life.
If the leaf cell is opened the caterpillar defends itself by arching its front quarters over its back and splaying its legs, thus creating the illusion that it is not a harmless caterpillar but an aggressive ant.
When fully grown a Celaenorrhinus caterpillar is typically translucent dark green, covered in very short whitish hairs, and with a large dark coloured head.
Pupation takes place in a newly formed cell constructed from living foliage or dead leaf litter. The pupae are typically cylindrical, widest at the thorax, tapering towards the head and gently towards the rear.
Adult behaviour
The adults have an extremely rapid flight, twisting and turning evasively before eventually settling under the leaves of ferns and other vegetation. They prefer to fly in hot sunny conditions, but in cool and overcast conditions are still remarkably alert and capable of very rapid manoeuvres.
 

 

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