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Trirhabda
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Trirhabda sericotrachyla
Photo#1360278
Copyright © 2017
James Bailey
Trirhabda on Artemisia californica -
Trirhabda sericotrachyla
Laguna Coast Wilderness, Orange County, California, USA
April 23, 2017
Size: 8.5mm
Images of this individual:
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Contributed by
James Bailey
on 24 April, 2017 - 10:38am
Last updated 27 May, 2017 - 11:07am
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Trirhabda
.
…
James Bailey
, 27 May, 2017 - 11:07am
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Pubescence is visible on sternum, and (finely) on elytra here
...but
not
on pronotum! Again, that's a "strike" against
sericotrachyla
here (at least as far as current keys & descriptions go).
On the other hand, the pronotal spots here (and in your other shots) appear pretty much entirely piceous...which is a character of
sericotrachyla
. In
luteocincta
, the pronotal spots are supposed to have "metallic green luster", according to both Blake and Hogue...which is not the case in your photos. So that character, together with the color pattern of the venter, argues in favor of
sericotrachyla
.
It should be mentioned that, in the keys, the lack of pronotal pubescence together with the lack of green luster for the pronotal spots, leads to
T. confusa
as a candidate. But that species is described as having elytra with "long, silky pubescence"...which doesn't fit here. Also, although
confusa
was earlier believed to have
Artemisia californica
as its host plant (i.e. by Blake), Hogue and others (e.g. Swigoňová & Kjer
(
1
)
) assign rabbitbrush (
Ericameria sp.
, formerly
Chrysothamnus
) as the host plant for that
T. confusa
...which is consistent with all the
present BugGuide posts
for that species.
Note that the 1982 paper of O'Brien & Ansatt mentions that
T. confusa
was previously recorded for the area...though they never encountered any in their study.
…
Aaron Schusteff
, 25 April, 2017 - 3:11am
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Moved
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…
James Bailey
, 24 April, 2017 - 10:40am
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