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Cerambycidae, dorsal - Parelaphidion aspersum

Cerambycidae, dorsal - Parelaphidion aspersum
100 Acre Wood, Winneshiek County, Iowa, USA
July 20, 2011
Size: 16 mm
Parelaphidion aspersum perhaps
It doesn't show up in the photos but the mid-line of the pronotum is glabrous.
Black light

Images of this individual: tag all
Cerambycidae, dorsal - Parelaphidion aspersum Cerambycidae, lateral - Parelaphidion aspersum Cerambycidae, ventral - Parelaphidion aspersum Cerambycidae, pronotum - Parelaphidion aspersum Cerambycidae, elytral tips - Parelaphidion aspersum Cerambycidae, live - Parelaphidion aspersum - female

Female (last antennomere not distinctly longer than penultimate) P. aspersum antennae are nearly as long as the body, while in P. incertum they are barely mid-elytral in length. I also agree with Doug's comments on pubescence pointing towards the former.

Moved tentatively, pending expert input; good call!
Moved from Longhorned Beetles.

Doug Yanega:
"This belongs to one of the absolutely most difficult pairs to separate of all the species I studied: females of Parelaphidion aspersum versus P. incertum. In this case, since the antennae are not straight back, it's not much better than a 50:50 guess. The scape and 4th segment are roughly equal, so that's not much help. About the only thing here that might be definitive is that she does appear to be in fairly pristine condition. As such, the reduced degree of elytral mottling would not be attributable to wear; and unworn specimens of aspersum have visibly less pale spotting than unworn specimens of incertum. It was not something I put much faith in for general use, since it was only true of unworn specimens, but in this case it would tilt the scale in favor of this being aspersum."

Thanks much
for all the effort and expertise.

Moved from Cerambycinae.

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