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 Cerambycidae Lamiinae
 Lamiini
 Malaysia, Thestus: oncideroides
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Gontran
Member Purpuricenus

Canada
426 Posts

Posted - 15/12/2017 :  16:49:58  Show Profile  Email Poster  Reply with Quote

338.68áKB

From Perak, rather small specimen,26 mm.
Thestus species?

Gontran

Edited by - Xavier on 15/12/2017 18:03:26

Capitaine
Scientific Collaborator

France
1196 Posts

Posted - 15/12/2017 :  17:09:20  Show Profile  Email Poster  Reply with Quote
I've a specimen very close labeled: Thestus alexandrae, in fact Thestus alexandra (Thomson, 1878) for Titan. This one should be a female.

Claude
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Gontran
Member Purpuricenus

Canada
426 Posts

Posted - 15/12/2017 :  19:27:14  Show Profile  Email Poster  Reply with Quote
Merci Claude.

Gontran
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dryobius
Member Rosenbergia

USA
1354 Posts

Posted - 15/12/2017 :  21:55:30  Show Profile  Email Poster  Reply with Quote
I believe this is Thestus oncideroides Pascoe, 1866.

Note the hairy fringe on the antennae. Both male and female of T. oncideroides have this feature. T. oncideroides is much smaller than T. alexandra.

T. alexandra does not possess an antenna with visible fringe of hair.

Lastly, both species occur in Borneo and West Malaysia.
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Gontran
Member Purpuricenus

Canada
426 Posts

Posted - 15/12/2017 :  22:42:32  Show Profile  Email Poster  Reply with Quote
Thank you Dan. I will look more closely at that.

Gontran
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Xavier
Scientific Collaborator

France
8349 Posts

Posted - 15/12/2017 :  23:30:17  Show Profile  Email Poster  Reply with Quote
Indeed ! Well done, Dan.
Here the original drawing of Thestus oncideroides Pascoe, 1866.

Edited by - Xavier on 15/12/2017 23:31:03
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Capitaine
Scientific Collaborator

France
1196 Posts

Posted - 16/12/2017 :  10:45:39  Show Profile  Email Poster  Reply with Quote
Thanks Dan and Xavier for these precisions, I take this opportunity to correct the label of my ex.(hairy)

Claude
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Gontran
Member Purpuricenus

Canada
426 Posts

Posted - 16/12/2017 :  15:52:06  Show Profile  Email Poster  Reply with Quote

472.54áKB

Thanks to all of you. Now, to make sure for the corrections, if the one at left is Thestus oncideroides, then at right should be T. alexandra from Sumatra, Mt. Dempo.
Even if antennae are slightly hairy underneath?.

Gontran
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Gontran
Member Purpuricenus

Canada
426 Posts

Posted - 16/12/2017 :  16:05:22  Show Profile  Email Poster  Reply with Quote

476.32áKB

Please, again. These from Malaysia are also T. alexandra.
Right?

Gontran
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dryobius
Member Rosenbergia

USA
1354 Posts

Posted - 16/12/2017 :  23:05:37  Show Profile  Email Poster  Reply with Quote
This key to Thestus is from an unpublished manuscript from Hudepohl based on Breuning's key.

I haven't had time to study it. And I am not familiar with Thestus chassoti.

The key does not mention the fringe on the antennae.


1 Pronotum with small tubercle instead of lateral spine 2
- Lateral spine of pronotum long and acute 3

2 Lower eye lobes distinctly longer than genae; elytra apically rounded. Thestus oncideroides
- Lower eye lobes two and a half times as long as genae; sutural angle of elytron acute, slightly prominent. Thestus chassoti Breuning

3 Sutural angle of elytron forming lobe. Thestus alexandrae
- That angle not forming lobe. Thestus philippensis
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Gontran
Member Purpuricenus

Canada
426 Posts

Posted - 17/12/2017 :  15:19:58  Show Profile  Email Poster  Reply with Quote
Thank you Dan. I will manage with that key.

Gontran
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Gontran
Member Purpuricenus

Canada
426 Posts

Posted - 17/12/2017 :  16:47:56  Show Profile  Email Poster  Reply with Quote
Dan, it's OK with oncideroides, philippensis and alexandra but my chassoti are probably alexandra (with lateral spines on pronotum), also from Malaysia.
Thanks again.

Gontran
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