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TaxonomyBrowseInfoImagesLinksBooksData
Photo#40706
Erynnis tristis? - Erynnis tristis - female

Erynnis tristis? - Erynnis tristis - Female
Rancho Santa Ana Botanic Gardens, Claremont, Los Angeles County, California, USA
September 6, 2005
In Oak Woodland, near Pacific Live Oak (Quercus agrifolia).

There are reportedly only two Duskywings in southern California with a white trailing edge on the hindwing:
Erynnis tristis, and E. funeralis.

After careful study of descriptions and images, taking into account variations, I tend to think that this is E. tristis.

However, in some photos Mournfuls look like Funerals and vice versa. The mournful situation is that I'm still not certain. Oaks speak for tristis, also it isn't dark enough, nor the contrasting patch on the forewing light enough, to be funeralis.
Images fairly close (I think the present specimen is somewhere in between) are here:

http://www.mariposasmexicanas.com/erynnis_t_tristis.htm

and here:

http://www.naba.org/chapters/nabast/mournful.html

Images of this individual: tag all
Erynnis tristis? - Erynnis tristis - female Erynnis tristis - female

For what it's worth, I think you've got it.
I've been doing some digging on this topic recently and have concluded that both duskywings I've posted are Funereal. On a count today, I saw a bunch more and feel these are also Funereal. At least in Orange County, Mournfuls are scare.

Yours looks different than mine, and I'll bet yours is Mournful. But hey, that's just gut feel.

Have you seen "The Butterflies of Orange County, Californa" by Larry J. Orszak? Published in the seventies, it's the standard source for this area. He states that it is "extremely difficult" to distinguish type without genitalic dissection and shows line art views of male genitalia. (I could email if you're interested.)

I assume you already know that from Arizona east the two are more easily distinguished, as described in "Butterflies Through Binoculars: The West." Oh, the penalties of living in The Golden State.

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