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Orange Black Stink Bug
 
 

                    

Shield Bugs - Tribe Halyini 

The bugs in the tribe Halyini have the typical shield shape body. They are usually from brown to dark brown in colour, with triangular-shaped scutellum. 
 
Nymphs of different species in Halyini 
 
The tribe Halyini also known as Halys Group. There are quite a number of different tribe Halyini shield bugs in Brisbane Eucalyptus forest.  Most of them are the typical shield-shaped and looked similar. They include the genera Alcaeus, Dippilana, Poecilometis, Theseus, Anchines, Bathrus, Accarana, Austromalaya and Platycoris. They are usually large to medium in size with greyish, brownish or reddish brown in colours. The number of apparent antennal segments varies between three and five. 
 
They are usually associated with Eucalyptus, Acacia or sometimes other native plants. They include some of the most common stink bug species in Australia.
 
Following listed the bugs in this tribe that we found in Brisbane so far; 
 

Genera Alcaeus

This genera resemble the Poecilometis genera, however, its front wings membrane veins is reticulate instead of linear. There are four species in this genera, we found one in Brisbane.
 
Acacia Shield bug
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Alcaeus varicornis, body length 20mm
This genera resemble the Poecilometis genera, however, its front wings membrane veins is reticulate instead of linear. This bug was very hard to be noticed on the Acacia tree trunk because of its camouflaged colour. Please check this page for more pictures and information. 
 

Genera Theseus  

We found one species in this genera. This species looks very similar to the Shield Bug in genera Poecilometis except with wings shorter than abdomen and the wing veins are different.
 
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Theseus modestus, body length 15mm
This shield bug looks very similar to the Common Gum Tree Shield Bug. Both can be found on the gum tree trunk. However, this shield bug is less common in Brisbane. Please check this page for more information.
 

Genera Poecilometis

Poecilometis stink bugs can be distinguished from other similar genera by  wings longer than abdomen, with wing veins linear and mostly subparallel. Antennae are basically 4-segmented but appearing 5-segmented in a number of species owing to a secondary subdivision of the 2nd antenna1 segment. They have the typical shield-shaped body which is in general longer than other stink bugs. The head is moderate elongate with round apex. 
 
 
We found four Poecilometis species in Brisbane. They are common in Brisbane Eucalyptus Forests.

Genera Anchises

Looks similar to Poecilometis, but can be distinguished by the wing veins. There is only one Australian species in Genera Anchises.
Golden Brown Shield Bug
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Anchises parvulus, 2nd instars body length 15mm, adult body length 5mm
We saw this stick bug mother with her new hatched babies on a gum tree leaf. When we get near to have a closer look, the mother bug always tilt her body towards us blocking our vision to her babies. No matter how we disturbed her, she just stayed on top of her young bugs and did not move a bit. More information and pictures please click on here.
 

Genera Bathrus

The bug looks similar to Poecilometis, but can be distinguished by the wing vein. There is only one Australian species in Genera Bathrus
 
Zebra Shield Bug
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Bathrus variegatus, body length 15mm
This bug is dark brown patterns on and white or pale brown in colour. There are the metallic green patches on body. Please check this page for more pictures and information.
 

Genera Austromalaya

This shield bug looks very similar to the shield Bug in genera Poecilometis. We distinguished it by its wing veins. 
 
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Austromalaya reticulata, body length 20mm
We found this bug once in Karawatha Forest during mid summer. It was resting on a burnt tree trunk. Please check this page for more information.
 

Genera Platycoris

The stink bug has a round and thick body, brown in colour with typical stick bug colour pattern. There is eight Australian species in genera Platycoris
 
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Platycoris (Hypogomphus) bipunctatus, body length 12mm
We found this bug in rainforest near Mt Nebo during late summer. There were quite a number of them on large gum tree trunks during the day. Some found resting on leaf. Please check this page for more information.
 

Reference:
1. Insects of Australia, CSIRO, Division of Entomology, Melbourne University Press, 2nd Edition 1991, pp 508.
2. Stink Bugs of Australia - FaunaKeys,  Australian Museum online 2003.
3. Halyini - Australian Biological Resources Study, Department of the Environment and Heritage, Commonwealth of Australia 2005.
4. Pentatominae - tribe Halyini - by Nick Monaghan, lifeunseen.com. 
5. A revision of the species of Australian and New Guinea shield bugs formerly placed in the genera Poecilometis Dallas and Eumecopus Dallas (Heteroptera: Pentatomidae), with description of new species and selection of lectotypes.  - Gross, G.F. (1972). Aust. J. Zool. Suppl. Ser. 15: 1-192 (description, revision).
6. Plant-feeding and Other Bugs (Hemiptera) of South Australia. Heteroptera Part II - by Gordon F. Gross, South Australian Government Printer, Adelaide, 1976.

 

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Last updated: August 12, 2010.