Tasmania has nine species listed.
Pending ID – Neolaemosaccus
#1. Neolaemosaccus sp.
Mid January 2017
Sandfly
Length not including rostrum approx. 4mm.
Photos AD
#1.5. Mid March 2014
Port Sorell
On Acacia longifolia subsp sopohorae.
Subfamily identification thanks to Boris Büche.
Photo KE
#2. Neolaemosaccus
Early November 2017
Kingston Beach
Identification to subfamily thanks to Boris Büche and to genus Otto Bell.
Photo KE
#3. Late December 2020
Knocklofty Reserve, Hobart/nipaluna
Identification to subfamily thanks to Boris Büche and to genus thanks to Simon Grove (TMAG)
Photos KE
#4. Early October 2013
Tomahawk
On Acacia longifolia subsp sopohorae.
Photos KE
. 
#5. Late September 2017
Knocklofty Reserve, Hobart
On Acacia melanoxylon
Photo KE
#6. 3mm
Early December 2015
Hobart
Feeding on Eucalyptus morrisbyii
Subfamily identification thanks to Boris Büche
Photos KE
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. 
#6.1.
Early January 2022
Tarraleah
On Eucalyptus globulus
Photos KE
#7. Late December 2016
Knocklofty Reserve, Hobart
On Acacia dealbata
Photos KE
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. 
#8. Mid November 2017
Knocklofty Reserve, Hobart
On Acacia melanoxylon
This was attempted to drop to the ground to avoid my attention, but I (accidentally) caught it underneath the leaf.
Photos KE
#9. Late December 2019
Knocklofty Reserve, Hobart
On Acacia melanoxylon
Photos KE
#10. Late December 2019
Knocklofty Reserve, Hobart
On Acacia dealbata
Photos KE
#11. Late November 2015
Knocklofty Reserve, Nipaluna/Hobart
On Acacia dealbata
Photos KE
References:
Grove S.J., Forster L. G. ,Porch, N. (2021) An illustrated checklist of the insects of Tasmania. Part 1 – Coleoptera (beetles). The Royal Society of Tasmania. Hobart