ID requested for Lycaenidae

[butterflyrajib]

Dear Sir/Madam,
I am uploading one image for indentification purpose. Species captured for Jayanti river, Alipurduar, West Bengal, India in the month of April 2018. Extreemly sorry for poor quality image upload.

Regards,
Rajib Dey
Mob.: +91-9831632692
India

[Psyche]

This looks to be a fairly typical male Nacaduba berenice. In your area should be ssp. plumbeomicans.
Dark striae strong; FW band crooked; innermost costal spot present ;submarginal spots narrow, point acuminate .

There is a lot of confusion with the 6Line Blues in ID.

I'll start with the two easier ones.

A. Larger size. Males with the dark striae within the white striae poorer. Females generally with better dark striae.
Males termen(outer margin) straight.

A1. Nacaduba beroe gythion : a ,Male with the dark striae very poor or obsolete. b. FW with the innermost costal spot above the midcell band absent.
c. FW postdiscal band often dislocated in the middle; submarginal spots variable. d. wing base often dark in the male.
Criterium b is about 98% certainty. Criteria a + b is absolute certainty.

Males.
https://www.ifoundbutterflies.org/media_images/2015/95_5129-489-5522c9dbe22f4-1.jpg
https://www.thaibutterflies.com/wp-content/uploads/2016/07/Nacaduba-beroe-1080x720.jpg

Female.Note total absence of the innermost FW costal spot.
https://www.ifoundbutterflies.org/media_images/2016/137_10730-436-569ce0cfe1ecc-2.jpg


A2. Nacaduba kurava. ssp. canaraica & euplea.Male with dark striae poorer.
1. FW postdiscal band typically straight; 2. FW submarginal spots large, often blocky with rounded margins, ;HW spot 6 large quadrate.
Male.
https://www.ifoundbutterflies.org/media_images/NacadubaKurava/01NacadubaKurava_HemantOgale_ah232.jpg
https://www.ifoundbutterflies.org/media_images/2015/352_9357-238-5634a6b23c9c1-1.jpg
ssp euplea.Thailand
https://www.thaibutterflies.com/wp-content/uploads/2016/07/Nacaduba-kurava-1-1080x720.jpg
Female.
https://www.ifoundbutterflies.org/media_images/2016/thumb/th_106_9932-120-5658a7ff038d1-1.jpg
https://www.ifoundbutterflies.org/media_images/NacadubaKurava/54NacadubaKurava_MilindBhakare_ar088.jpg
https://www.ifoundbutterflies.org/media_images/NacadubaKurava/thumb/th_29NacadubaKurava_KSaji_ae302.jpg
https://www.ifoundbutterflies.org/media_images/NacadubaKurava/thumb/th_03NacadubaKurava_HemantOgale_ai374.jpg

[Psyche]

B: Dark striae well-developed in both sexes. Smaller.


B1. Nacaduba berenice ssp ormistoni & plumbeomicans.Male FW with gently rounded termen (outer margin).Upperside pale blue with frosting (icing).
FW postdiscal band crooked or dislocated; submarginal spots often narrow in male, irregular.

Male.
Singapore ssp icena.
http://www.butterflycircle.com/checklist/mugshots/Nacaduba%20berenice%20icena/Rounded%206%20Line%20Blue%20-%20Neo%20Chee%20Beng.jpg
Thaialnd ssp aphysa.
https://www.thaibutterflies.com/wp-content/uploads/2016/07/Nacaduba-berenice-1080x717.jpg
India ssp ormistoni.
https://www.ifoundbutterflies.org/media_images/NacadubaKurava/NacadubaKurava_GauravAgavekar_ag319.jpg
https://www.ifoundbutterflies.org/media_images/NacadubaBeroe/NacadubaBeroe_GauravAgavekar_ag351.jpg
https://farm4.staticflickr.com/3683/18675698848_359fca5207_b.jpg
Male upperside blue with frosting.
https://www.ifoundbutterflies.org/media_images/NacadubaBeroe/NacadubaBeroe_GauravAgavekar_ag350.jpg
Female Singapore ssp icena.
https://c1.staticflickr.com/2/1740/42819678991_fbb82f00d2_b.jpg


B2. Nacaduba calauria ssp evansi & toxopeusi : Similar to N. berenice, dark striae strong in both sexes.
1. Male FW more rounded. ; 2. FW postdiscal band typically straight . 3 . FW submarginal spot 4 & 5 usually broadly taper to a sharp point; the other spots not so pointy;
Can be very difficult to separate from N. berenice. Male upperside dark violet blue without frosting.
Male.
https://www.ifoundbutterflies.org/#!/sp/3207/Nacaduba-calauria
Singapore 2 males & female ssp malayica.
https://wanderingbutterflyeffect.files.wordpress.com/2009/03/6a0100a801ee89000e011017b3ad98860e.jpg
https://static.inaturalist.org/photos/8499740/original.jpg?1497763633
http://www.butterflycircle.com/checklist/mugshots/Nacaduba%20calauria%20malayica/Nacaduba-calauria-malayica---2--.jpg


TL Seow: Cheers.

[butterflyrajib]

Thank you Sir for your valued information.