Butterflies and Moths of North America

collecting and sharing data about Lepidoptera

  Sighting 1268646

Coronis Fritillary
Speyeria coronis

Observation date: July 12, 2020
Submitted by: Harry Forbes
Specimen type: Photograph
Observation notes: I originally submitted only the upperside of this butterfly under sighting number 1260265, with a suggested ID of Northwestern Frit. Since then, I have added an underside view and have changed my call to Zerene, based on the heavy black markings above and the flattish marginal spots below with again the heavy black markings showing. Nobody ever accused me of being a Frit expert, as Greater Frits have been very troublesome for me wherever I have been out West----to CO, MT, ID and WA----because of their variability from place to place , among other things. So I'll take the plunge here and see how it works out from an expert's perspective. Butterfly here was feeding on Milkweed in a mountain meadow at 9000 feet elevation, where it was sunny and warm.
Status: Resident
Verified by: mikefisher
Verified date: November 17, 2020
Coordinator notes: Given the location of the record I would say this is Northwestern Fritillary, however the two species are extremely similar. I would defer to someone with more experience with the Greater Fritillaries. -AZ *****No, this is the Coronis Fritillary with brown disc on the hindwings and large, fairly round spots that are silvered. The Northwestern Fritillary in your are would not have the spots silvered on the underside of the hindwings. There are other difference between Coronis and the Zerene Fritillary but the easiest to see is on the one here in your photo. The caps on the spots at the outer edge of the hindwings are brown without green. On zerene they are most often green or greenish-brown, never fully brown as they are on this subspecies of Coronis east of the Continental Divide (halycone). Zerene is uncommonly found east of the Divide (and not as far south as Park County) and most near to it only in the counties to the north; it is found mostly west of the Divide and most commonly in the northwestern counties. A smaller fritillary than coronis too. Mike
Checklist region(s): United States, Colorado, Park County