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Photo#125066
sap hister beetle? - Paromalus teres

sap hister beetle? - Paromalus teres
Mt. Washington, Coos County, New Hampshire, USA
June 30, 2007
Size: about 2.4 mm
Found in fairly fresh, sappy evergreen stump along with various sap-loving species. I was struck by the uniform punctation, lack of stria, and parallel-sided shape of this little guy. Maybe he was there to feed on any sap-feeding fl*y la*rvae.

This find was one of the many collateral benefits in my Forest Service-approved search for Py*tho str*ictus.

Images of this individual: tag all
sap hister beetle? - Paromalus teres sap hister beetle? - Paromalus teres sap hister beetle? - Paromalus teres sap hister beetle? - Paromalus teres sap hister beetle? - Paromalus teres sap hister beetle? - Paromalus teres sap hister beetle? - Paromalus teres sap hister beetle? - Paromalus teres

Moved
Moved from Clown Beetles.

Paro*malus?
Size, no striae, and habitat fit for that genus.

 
prosternal keel w/o carina
I was initially thinking Ter*etrus, but after looking up Pro*malus, that seems the better choice. Jim, if you image (or just Mk 1 eyeball) the prosterum, Pro*malus should have the prosternal keel without a carina (eliminates Platy*lomalus, with carina). Or if by chance the prosterum is notched to receive the mesosterum, that would mean Ter*etrus. But I think now you will not find this as such.

Downie and Arnett list three choices for Pro*malus:
"P. seeversi - pronotum distinctly alutaceous" 1.5-1.8mm
other two - "pronotum not alutaceous, shiny"
"P. bistriatus - mesosternal stria visible at middle" 2.0-2.4mm
"P. seminulum - mesosternal stria interrupted" 2.0mm

and UNH database lists only one - a 4th - P. teres LeConte (images in the MCZ)

 
Adding blowups of prosternum
for ID traits

 
looks like Promalus
Boris is correct again :) I don't see any carina on the prosternum. And I sure don't see the prosternum notched to receive the mesosternum. P. bistriatus still looks like a good fit (the sides of the pronotum seem to curve inward apically more than P. teres, matching yours better), although yours seems to have less elytra stria than any of these examples. D & A says that's allowed in Promalus - the stria can be faint or absent.

Another new genus for BugGuide :)

 
P. teres
The species you suggest has a continous notable curvature of the sides whereas P. teres has nearly parallel sides for a decent interval. It is also the only one listed for the genus on the UNH checklist.

btw, you can see some faint striation in this image:


I'm moving this to species page thanks to help from you and Boris :-)

 
Images
P. ter*es, P. bistr*iatus, Platy*lomalus aeq*ualis, Ter*etrius sp.

Nomina nearctica lists nine spp. of Paro*malus, eight of Ter*etrius, and just a single sp. of Platyl*omalus.

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