From Atlas Pro.

Today I investigate one of the rarest butterflies in California in the hopes of figuring out the mystery behind its disappearance!

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Sources / further Reading:

https://bioaccumulation.wordpress.com/tag/parnassius-clodius-strohbeeni/

https://www.butterfliesofamerica.com/L/t/Parnassius_clodius_a.htm

https://baynature.org/article/presumed-extinct/

https://zayantesandhills.com/Zayante%20Sandhills%20Conservation%20Bank%20web/SANDHILLS%20Information.pdf

https://archives.santacruzmah.org/guides/guide-to-the-john-strohbeen-scrapbooks-collection/history/

http://www.ucpress.edu/books/sale/pages/10386.html

https://extinctanimals.proboards.com/thread/1866/parnassius-clodius-strohbeeni-strohbeen-parnassian

https://web.archive.org/web/20081015195825/http://isabellakirkland.com/descend_story.html

https://bioone.org/journals/the-journal-of-the-lepidopterists-society/volume-67/issue-3/lepi.v67i3.a7/The-Dodge-Family-An-Enduring-Tradition-of-Entomology/10.18473/lepi.v67i3.a7.full

https://www.google.com/books/edition/Butterflies_of_the_San_Francisco_Bay_Reg/P-XeEAAAQBAJ?hl=en&gbpv=1

https://images.peabody.yale.edu/lepsoc/jls/1950s/1956/1956-10(3-4)113-Tilden.pdf

https://images.peabody.yale.edu/lepsoc/jls/1990s/1990/1990-44(1)45-Smith.pdf

https://www.butterfliesofamerica.com/L/t/Parnassius_clodius_a.htm

https://bugguide.net/node/view/919686

https://www.alltrails.com/us/california/bonny-doon–2

https://images.peabody.yale.edu/lepsoc/nls/1960s/1960/1960_v02_n5.pdf#page=2

https://nap.nationalacademies.org/read/11761/chapter/14#286

https://books.google.com/books?id=vLw9AAAAIAAJ&q=parnassian#v=snippet&q=parnassian&f=false

https://baynature.org/article/field-https://www.swsbm.com/Maps/Dicentra_formosa.gif

guide-to-the-lost-species-of-the-san-francisco-bay-area/

https://www.berkeleydailyplanet.com/issue/2007-05-29/article/27168?headline=Wild-Neighbors-Getting-to-Know-Your-Local-Butterflies–By-Joe-Eaton

https://books.google.com/books?hl=en&lr=&id=uLs9AAAAIAAJ&oi=fnd&pg=PA11&dq=sternitzky+parnassius&ots=FqVontrSbd&sig=cbsqfjWSACXcTu3vrG81ui3CROE#v=onepage&q&f=false

https://www.inaturalist.org/check_lists/10675-Butterflies-of-California

https://baynature.org/article/raising-the-dead-bringing-ghosts-to-life-october-december-2007/

https://baynature.org/article/presumed-extinct/

https://books.google.com/books?id=5KdOAAAAMAAJ&focus=searchwithinvolume&q=parnassius

https://images.peabody.yale.edu/lepsoc/nls/1960s/1960/1960_v02_n5.pdf

https://mczbase.mcz.harvard.edu/name/Parnassius+clodius+strohbeeni

https://mczbase.mcz.harvard.edu/guid/MCZ:Ent:27214

https://mczbase.mcz.harvard.edu/guid/MCZ:Ent:192164

https://search.lib.umich.edu/catalog?query=author%3A%22New+England+Zoological+Club%22&library=U-M+Ann+Arbor+Libraries

https://zayantesandhills.com/Zayante%20Sandhills%20Conservation%20Bank%20web/SANDHILLS%20Information.pdf

https://www.etsy.com/listing/1502844929/wildflowers-of-the-santa-cruz-sandhills