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Photo#101518
California Dogface BF - Zerene cesonia

California Dogface BF - Zerene cesonia
Skull Valley, AZ, USA (WSW of Prescott 10 miles), Yavapai County, Arizona, USA

Images of this individual: tag all
California Dogface BF - Zerene cesonia California Dogface BF - Zerene cesonia California Dogface BF - Zerene cesonia California Dogface BF - Zerene cesonia

Female Southern?
All descriptions of C. eurydice I've seen allow a very narrow dark border on the FW, and no "dogface", for females. Here are some internet examples given for males and females: 1 , 2 , 3 .
Brock & Kaufman ((1), p.69) show your butterfly as a female of C. cesonia (Southern Dogface).
Though I have read about hybrids between the two species where their range overlaps, yours seems to me a straight Southern female.
I should add, however, that this is still a neat find

 
p69
In Kaufman in referring to the female : "rarely with faint dogface outline" ? ? ? ?

 
Interesting,
I'm looking at the statement regarding eurydice on p.68 (Brock & Kaufman): "Female all yellow, rarely with faint dogface outline; note wing shape." The "dogface" on this specimen is hardly faint, but perhaps there's a point regarding the pointed tip. Is it more pointed than usual for cesonia ? Perhaps, if we go by the illustrations in this guide (p.69), and other authors (e.g. see cit. below) also mention this difference.
Concerning the FW apex, Opler (1) writes: "Forewing tip pointed" for euridice ; but "Forewing apex slightly pointed, not rounded" for cesonia . Regarding pattern in female Southern DF, Opler states "Female with black areas diffuse". This seems to be the case in the present photos. Opler adds that California DF female "usually lacks any hint of dog's head markings". Scott (2) notes that in cesonia both sexes have a "dog face" with a black eye on the upf. I suggest to look at the full text in both Scott and Opler. Emmel & Emmel (3) discuss hybrids from the San Bernardino and San Jacinto Mountains of SoCal, with color plates. Can such hybrids occur near Prescott where eurydice doesn't seem to be listed?
Personally, I don't care on which side this female should be shelved, as long as there's good reason for the placement. However, I'm not convinced that this female is a California DF. Neither am I convinced (based on the literature & images consulted)that this could be a hybrid; except for the FW point perhaps.
A perusal of the literature, and perhaps a look at a good collection of specimen should sway your opinion one way or other.
Additional reference with second from right photo.
Another photo reference: dallasbutterflies . Robert's female has arguably as much of a pointed FW apex as the one pictured at dallasbutterflies.

 
Hind wing marking
The Southern DF has very distinct black edge on the upper hindwing. California DF does not, nor does my specimen. I am not expert in this business! Who can enlighten us?

 
Confusing Specimen
Robert pointed out another trait that points this Dogface to the California: the shape of the FW tip. Is this a result of rare female pattern variance in the California Dogface, or is this an example of hybridization? I am unfamiliar with both factors in this species.

 
Apologies
for being so misleading on this ID. Hartmut is right that this is actually a female C cesonia. I used the same guide by Brock & Kaufman, but somehow managed to read the wrong caption! (so embarrassed...)

 
Happens to the best of artists!
Being a skeptic, I rechecked my books as well as internet sources. On the whole this turned out to be an interesting exercise for which I'm indebted to you.
So, lets park these images on the appropriate species page - these two species have been placed back into the genus Zerene , apparently because of character differences in genitalia, and wing venation from Colias .

 
I have thank you too...
it is making and realizing errors like this one which cause me to become increasingly careful with ID's that I make!
I'm very skeptical of any ID's that I make, so I, too, recheck with various internet sources. I guess this time I still failed - must have been the time of night!

 
Moved
to species page.

Nice.
I saw a male here in Tucson (Pima Community College West Campus) on March 31. Nice to have a corresponding image to confirm my sight ID:-) I wasn't expecting to see any this early in the year.

Cool
Looks like we now have upper-wing shots of this species for the guide. This one is a female, too. Nice find.

 
Thanks Eric & Stephen
I was pretty excited about finding it & being able to ID it was'nt hard once I got the upper forewing pattern.

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