Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Photo#527112
Another Sericosema? - Sericosema juturnaria - male

Another Sericosema? - Sericosema juturnaria - Male
Pinnacles National Monument, San Benito County, California, USA
June 5, 2011
I'm presuming this is probably Sericosema, like this one...seen last year around the same time and locale. Both S. juturnaria and S. simularia on the moth list for Pinnacles National Monument (see link to PDF at bottom of this web page).

Here the antennae are plumose...so this is a male.

Moved to Sericosema juturnaria
Moved from Sericosema.

Moved
Moved from Ennominae.

 
Thanks, Bob
Your action here helped bring this post back to my attention.

Moved
Moved from Geometrid Moths.

Key at AMNH
There is a key to Sericosema here which seems to exclude S. simularia as a possibility.

 
Finally got back to this
...and studied Rindge's 1950 revision as you suggested.

Firstly, I see your point about how Rindge's key excludes S. simularia here, since the key immediately separates it off via:

" Under surface of hind wings bisected by dark brown line with prominent outwardly projecting tooth in middle, basad of this light gray, distad dark brown, shading into gray near outer margin...............simularia "
Moreover, there are only 4 species...and two of them, immaculata and wilsonensis...are associated with higher elevation mountain habitats and far out of range according to the nice distribution maps in Rindge. Both also seem to be excluded in having the lower hind wing with separating line faint to lacking...as corroborated by BOLD and MPG images.

All this is completely consistent with the fact that only juturnaria and simularia appear on the Pinnacles Moth Species List (and the range maps in Rindge for both species engulf the Pinnacles area).

Add to the above that S. juturnaria appears to be the most commonly encountered species in the genus; that its host plants (Ceanothus and Frangula, both in Rhamnaceae) are abundant where this was photographed; and the good correspondence in terms of separating line, discal spot, and fairly uniform overall color with the S. juturnaria BOLD & BugGuide images below :

           

...and I think we have a pretty solid case for S. juturnaria :-)

Moved
Moved from Moths.