If you have Butterflies of the Malay Peninsula by Corbet & Pendlebury, then it is on page 4 & 5.
The numbering of the veins are from the lowest to the highest.
Note 3 veins are unbranched & always on the costa or forward margin, namely vein 10, 11, & 12.
(Correction: in Amathusines & some Satyrines vein 10 is joined to, ie. arises from vein 7.
Veins 7 , 8, & 9 are usually joined.
If so vein 7 is the lowest vein & vein 8 is said to arise from vein 7 & not the other way round.
likewise with vein 9.
If a vein is missing the first to be absent is assumed to be vein 8, followed by vein 9.
In the case of Delias including D. eucharis it is vein 10 , one of the unbranched costal vein which is absent, not vein 9.
The Wikipedia diagram by Bingham is a century old & outdated.
Likwwise , Sunny your diagram source is in error.
TL Seow
Clarification
The veins are arranged like the barbs of a feather.
From the central cell (= shaft or rachis of a feather) the free veins that run on one side are 12, 11, & 10 ,and on the other side 1 to 6.
At the apex 3 veins come close together & are joined to a common origin.
This is seen in most butterflies.
Sometimes vein 10 & or vein 6 also join.
In skippers all the apical veins remain free.
The Wikipedia drawing is a copy of the Delias diagram by Bingham & the veins would be considered wrongly labelled.
Last edited by Psyche; 22-Dec-2012 at 10:23 AM.
Reason: clarification
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