Scopula purata
Family Geometridae, subfamily Sterrhirnae
Photograph copyright by Tony Leukering
10 June 2012
Steelmantown bog
CMMP block D12
Like Horned Spanworm, Chalky Wave is a geometer, readily discerned as such by its spread-wing posture at rest. Though it may not appear so in this picture due to the strong focus on the moth, when I found it, I initially passed it off as a bird dropping. Fortunately, I looked closer! Even a quick glance at the distribution map will provide the information that the species seems to have a strong coastal-plain affinity. Whether this apparent affinity is real or just an artifact of poor sampling -- and the few number of locations might well indicate that -- is unknown. However, given the few records, even on the heavily human-populated East Coast, I suspect that the species is probably tied to some rarish host-plant species. Given that we apparently do not know what that host plant is and that none of the usual picture sources (Bug Guide, BAMONA, and MPG) have a photograph of the caterpillar, I think that my hunch may be correct.
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