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Mecysmus angustus - Mecysmus

Mecysmus angustus - Mecysmus
Algodones Dunes near Ogilby, Imperial County, California, USA
July 3, 2015
Came to black light. Appears to be a new species for Bugguide, assuming my ID is correct. See reference here:

nice; what are the differences between the two spp.?
the cited source is silent about it

Moved from ID Request.

Two species
There are two species in California, and this specimen differs significantly morphologically from tenuis as pictured below, and appears to be the same as the cited reference.

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