ID help needed

[Psyche]

https://www.butterflycircle.com/atta...4&d=1751435660

Nacaduba hermus male.
The four line blues can be rather difficult to ID.

N. pactolus can be IDed by the combinations.
HW tornal black spot always with metallic scales.
white striae often broad or diffuse,dark striae absent.
HW submarginal spots 'flat' with level inner margins, topped by a large squarish spot 6.
https://www.butterflycircle.com/chec...-%20horace.jpg
https://www.butterflycircle.com/chec...0-%20Sunny.jpg

Species with the dark strae obsolete or nearly so.
N. sanaya, subperusia, & pendleburyi.

Species with strongly developed dark striae, tornal spot always with metallic scales.
N. pavana, russelli.

Species with heavy white striae and metallic scales on the tornal black spot.
B. pactolus, angusta.


Nacaduba hermus is uniquely halfway between those with strong and those with no dark striae.
Dark straie are patchy , partial or disintegrating.
The metallic scales on the tornal black spot may be weak or strong.
FW postdiscal band usually not dislocated at vein 6.
HW postdiscal band close to the submarginal spots which may be rounded.
https://yutaka.it-n.jp/lyc4/81200020.html
https://www.gbif.org/occurrence/2847201952
https://www.gbif.org/occurrence/4500772618
https://www.gbif.org/occurrence/2847201921
https://www.gbif.org/occurrence/4436196086


TL Seow: Cheers.

[Sailfish]

Thanks alot, Dr Seow.

[Sailfish]

Hi Dr Seow,

Is this Pelopidas mathias?
Screenshot 2025-07-04 211624(1).jpg

Thanks.

[Psyche]

Post 83.
https://www.butterflycircle.com/atta...8&d=1751685464
From its unevenly shaded ground colour this should be a male Pelopidas mathias.

Fieldshots of the two can be quite similar.
Females have similar spots.

Pelopidas mathias.
Male FW spots 2 & 3 quadrate, broad.
A line thru the two cellspots always cut the male brand.
In female, a line thru the cellspots moves toward or touch the spot in space 1b (variable).
Underside grey-tined, generally with a dirty look.
Males India .
https://www.ifoundbutterflies.org/si...d8457890-1.jpg
https://www.ifoundbutterflies.org/si...d8457890-2.jpg

https://www.ifoundbutterflies.org/si...a6d3a539-1.jpg
https://www.ifoundbutterflies.org/si...a6d3a539-2.jpg

Singapore.
https://blogger.googleusercontent.co...perside_01.jpg
https://blogger.googleusercontent.co...enedict_01.jpg
https://blogger.googleusercontent.co...perside_02.jpg
https://blogger.googleusercontent.co...S_adult_01.jpg



Pelopidas agna.
Male with FW spots 2 and 3 narrow.
A line thru the cellspots usually miss the brand.
In the female ,the line moves away from the spot in space 1b (variable).
Underside not grey-tinged, with a clean clear look.

Males India.
https://www.ifoundbutterflies.org/si...36ba6310-3.jpg
https://www.ifoundbutterflies.org/si...36ba6310-1.jpg

https://www.ifoundbutterflies.org/si...837_273650.jpg
https://www.ifoundbutterflies.org/si...837_273649.jpg

Singapore.
https://blogger.googleusercontent.co...A_male_05c.jpg
https://blogger.googleusercontent.co...A_male_05a.jpg
https://blogger.googleusercontent.co...A_male_06b.jpg
https://blogger.googleusercontent.co...SwiftF-KSK.jpg



Although these two are fairly common in Singapore , few observations have the desired upperside and unerside views together.
Such views are important to establish the variations in the appearances of the two species.

After a long search only two were found.
These observations show the two sides nicely.
https://www.inaturalist.org/observations/290635880
https://www.inaturalist.org/observations/295330377

TL Seow: Cheers.

[Sailfish]

Thank you Dr Seow.

[Sailfish]

Hi Dr Seow,
Is this Lasippa heliodore dorelia?


Thanks,

[Psyche]

Post 86.https://www.butterflycircle.com/atta...3&d=1751870165
Lasippa tiga.
Viewed in the set position.
FW submarginal spot 3 twice as wide as the spot below (spot 2) or above it (spot 4).
https://www.gbif.org/occurrence/2847207435
https://www.gbif.org/occurrence/2847207447


Lasippa heliodore.
FW submarginal spot 3 & 4 nearly pf similar width,Width of spot 2 variable.
https://www.gbif.org/occurrence/2847207371
https://www.gbif.org/occurrence/2847207380
https://www.gbif.org/occurrence/2847207388


TL Seow: Cheers.

[Sailfish]

Thank you Dr Seow.

[Sailfish]

Dear Dr Seow,

Your id for the nacaduba and skipper is greatly appreciated.

Screenshot 2025-08-07 213300(1).jpg

Screenshot 2025-08-07 213906.jpg

Thank you.

[Psyche]

Post 89

1.https://www.butterflycircle.com/atta...9&d=1754574632
Female Nacaduba sanaya.(Likely)

In the past there was a lot of confusion on whether N. subperusia is still present in Singapore.
The confusion stem from the key which state in N. sanaya the HW postdiscal band and the submarginal spots are wide apart.
Whereas in N. subperusia they are close together.

This female have the said bands/spots close together and should be considered as N. subperusia.

A better guide would be as follow.
NACSS.png
N. sanaya.
1 FW postdiscal band almost always dislocated at vein 6.
2. HW submarginal spots gradually decrease in size from spot 6 downwards.
3. HW postdiscal band and the submarginal spots usually well separated but variable and can be close together.
Males
https://blogger.googleusercontent.co...0/DSC_4923.JPG
https://www.besgroup.org/wp-content/...i-LenaChow.jpg
Females.
https://www.butterflycircle.com/chec...drick%20ho.jpg
https://thaibutterflies.com/wp-conte...a-sanaya-1.jpg
https://www.gbif.org/occurrence/2847201334
https://www.gbif.org/occurrence/2847201350


N. subperusia.
1 FW subapical band usually not dislocated but may be slightly so at vein 6.
2 HW postdisca and submarginal spots always close together.
3. HW submarginal spot 6 large decreasing abruptly to spot 5 & downwards.
Males.
https://www.gbif.org/occurrence/2847201282
https://thaibutterflies.com/wp-conte...bperusia-1.jpg
Females.
https://geenature.com/taxa/animalia/...uba-subperusia
https://thaibutterflies.com/wp-conte...subperusia.jpg

Added.
A male is needed to prove N. subperusia is extant.



2.https://www.butterflycircle.com/atta...0&d=1754574663
It is Pelpidas but beyond that it is hard to tell whether it is P. mathias or agna.



TL Seow: Cheers.