If there are no other 6line blues in south India other than the four, namely berenice, calauria. beroe & kurava then it becomes relatively easy.
The 6line blue in SE Asia are a bit different from that in India especially N. calauria.
1. N. beroe ;Male dark striae within the white striae disintergraded /obsolete.;costal spot above the innermost band always absent. Female with dark striae normal.
Male Thailand ,Female Singapore.
https://thaibutterflies.com/wp-conte...duba-beroe.jpg
http://www.butterflycircle.com/check...5_1-copy-4.jpg
2/ N. kurava . Male with dark striae weak , female normal ;Submarginal spots with rounded margins ;FW postdiscal band usually straight.
Male left, female right Taiwan.
https://farm5.static.flickr.com/4247...fe83fdc5_b.jpg
3. N. berenice : Dark straie strong in both sexes ; submarginal spots irregular in the male less so in the female;FW postdiscal band often irregular.
Singapore male & female.
http://www.butterflycircle.com/check...hee%20Beng.jpg
https://live.staticflickr.com/1740/4...b82f00d2_b.jpg
N. calauria ;Dark striae strong strong in both sexes ;Submarginal spots 4 & 5 sharply pointed; postdiscal bnad nearly always straight.
Male left ,female right ,Singapore.
http://www.butterflycircle.com/check...enry%20Koh.jpg
The N. calauria in India is different.
FW submarginal spots 2, 3, 4, & 5 strongly chevron & sharply pointed; FW postdiscal band crooked in the middle.
https://www.ifoundbutterflies.org/me...288755ea-1.jpg
Confusingly the male N. berenice in India looks rather like N. calauria in SE Asia, except the FW band is irregular.
https://www.ifoundbutterflies.org/me...2b069506-1.jpg
N. berenice with upperside confirmation pale blue with frosted appearance (like sprinkled powder.)
https://www.ifoundbutterflies.org/me...ekar_ag350.jpg
https://www.ifoundbutterflies.org/me...ekar_ag351.jpg
vs dark violet blue in N. calauria male (Singapore).
https://wanderingbutterflyeffect.fil...b3ad98860e.jpg
Thus.
1. N. berenice male.
2, N. beroe ; dark striae obsolete; costal spot above innermost band missing.
3. N. calauria FW submarginal spots 2, 3, 4, & 5 chevrons & sharp.
4. N. kurava ;FW submarginal spots large & with rounded margins; dark striae weak.
5, & 6 .N. calauria.
7. should be N. calauria .
TL Seow: Cheers.
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