A tricky Allotinus from S Thailand

[DaveChiangMai]

Allotinus species in southern Thailand are difficult to ID.
I have a number of photos of species from the south, but this one looks different - generally pale, brownish tornal edges of both FW and HW, as well as a series of submarginal bars on the HW.
I am wondering about A. davidis or A.leogoron.
I think the common A. horsfieldi can be ruled out on the HW spots 7 and 8 having spot 8 forward of spot 7.
Quite a confusing image.
From Bang Lang NP on the Thai - Malay border 24 Jun 25. At about 580 metres. Primary forest.
Any suggestions please? Many thanks.

28837

[Psyche]

Looks like you have found yourself a pretty rare species.

It should be Allotinus davidis.

Thankfully your picture have the resolution to see the small difference.

Two species have the two features.
1. HW with a large black discal spot in space 7.
2. FW apex with a white streak.

They are Allotinus substrigosus and davidis.

They differ in that the postdiscal spot 7 which just above postdiscal spot 6 is blacken on its inner margin in A. davidis.
This can be very difficult to see if the image is of poor quality.

In A. substrigosus , HW postdiscal spot 7 is not black-edged.
A. substrigosus is relatively common.
https://yutaka.it-n.jp/lyc2/80430001.html
https://www.gbif.org/occurrence/2847201202
https://www.gbif.org/occurrence/2847203173
https://wingscales.com/media/2400/2920-1-da918.jpg
https://thaibutterflies.com/wp-content/uploads/2016/07/Allotinus-substrigosus.jpg

There are few correct images of A. davidis.

1. The crescent postdiscal spot 7 is blacken on its inner edge.
https://www.gbif.org/occurrence/2847203304

In this example both postdiscal spot 6 & 7 are blackish.
https://yutaka.it-n.jp/npict12/80440001_n001.jpg







TL Seow: Cheers.

[DaveChiangMai]

Many thanks. That's good to read.
Now you mention it I see the white streak on the FW apex, though I had no idea it was a significant feature.
As you say, a rarely seen species.