Category Archives: caterpillar

Lophocampa roseata (Rosy aemilia)

I spent a good part of the day combing through my insect photos from the past 9 years. There are thousands. Finally, I found the ones I was searching for. I credit Victoria Compton on San Juan Island, WA  for helping me out on this one. She sent a photo the other day to my email with a caterpillar and had suggested an ID. Not only was she correct, but in ID’ing the caterpillar, it enabled me to match up one of my adult moth photos that had been sitting around nameless since 2016. The photos I found today were of the same caterpillar that had been a mystery to me since 2013. It’s a nice “aha” moment when you connect the dots! Below are the pics for you to see.

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Lophocampa roseata Photographed July 10, 2016 San Juan Island, WA


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Lophocampa roseata larva Photographed October 6, 2013 San Juan Island, WA

This is a Tiger moth in the family Erebidae, subfamily Arctiinae. The scientific name is Lophocampa roseata (also known as the Rosy aemilia). It was first described by Francis Walker in 1868.  They are found in Western Oregon and Washington as well as in Southwestern B.C. and are associated with habitats of conifer forests and maple trees. The sources I checked list them as somewhat rare and Natureserve lists them as “critically imperiled.” So, I guess we have another beautiful Lepidoptera on San Juan Island to care for along with the Marble Butterfly!

***Critically imperiled Tiger Moth. Please post/email photos if you live in San Juan County, WA and come across one in the adult or larval stage.  Thanks! 

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Lophocampa roseata larva Photographed October 6, 2013 by Cynthia Brast San Juan Island, WA


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Lophocampa roseata larva Photographed September 26, 2018by Victoria Compton San Juan Island, WA 

Helpful links:

http://explorer.natureserve.org/servlet/NatureServe?searchName=Lophocampa+roseata

https://www.inaturalist.org/taxa/224121-Lophocampa-roseata

https://www.butterfliesandmoths.org/species/Lophocampa-roseata

https://bugguide.net/node/view/247272

Lophocampa roseata larva
October 27, 2019
Three Corner Lake Road
Lophocampa roseata pupal case
Pupated 10-29-19

Lophocampa roseata larva
Found wandering in search of pupation site – October 27, 2019
San Juan Island, WA

Biston betularia cognataria (Pepper and Salt Moth)

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Last September, I found this little caterpillar on a fruitless cherry tree outside our home.   I may have spent a few hours watching it munch on leaves as I searched through literature and images in order to identify it.  The twig-like larva is in the Geometridae moth family.  Sometimes coming to a conclusion about a species takes a bit longer…and having an adult specimen can help, so I kept my caterpillar fed with an assortment of cherry, willow, maple, and alder leaves, watched it as it grew, then pupated…and waited over the winter months to see what would emerge.

Biston betalaria larva

Bilobed head of Biston betularia larva

I noticed last night when I went to brush my teeth that there was a little moth against the window of my insect habitat, watching me…and probably wanting out.  It’s good to check the critter-keeper (that’s what I call my bug house) daily because otherwise you might leave the poor soul stuck inside and that never ends very well.  In this moth’s case, I took a few pictures and then released him outside to fly away into the night.

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Biston betularia (newly-emerged adult)

Biston betalaria cognataria

Newly-emerged adult (male) Biston betularia cognataria

This is a quick post, since I am always short on time, but please enjoy my photos.  I do love the ones of the caterpillar most.  The little cat ears are quite distinct!

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Little “cat” ears

I’ve enlarged one to show you the spiracles, the little breathing holes that are along the sides of the caterpillar body.

Biston betularia larva

Biston betularia cognataria

 

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Showing spiracles near bi-lobed head

 

Many insecticides work by clogging up these holes with oils or soaps that are sprayed on the tree.  Although the caterpillars do eat leaves, the aren’t really an economic pest at all.  In fact, this species is quite remarkable in that it represents the fascinating study of natural selection and industrial melanism.  Widely distributed across the world, Biston betularia or Pepper and Salt Moths became recognized for their adaptation of darkening pigment, allowing them to become more cryptic on trees in woodlands in Britain polluted by soot around the turn of the century.  Check out my references for more information!

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Newly-emerged adult with pupal case (on left)

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Enlarged view of newly-emerged adult Biston betularia cognataria and pupal case

 

 

For further reading: 

Asami, T. and Grant, B. 1995. Melanism has not evolved in Japanese Biston betularia (Geometridae). Journal of the Lepidopterists’ Society, 49: 88-91. https://www.biodiversitylibrary.org/page/41142188#page/94/mode/1up
Furniss, R.L. and Carolin, V.M. 1977. U.S.D.A. Forest Service Misc. Publ. 1339, 1977. 
GRANT, B. and HOWLETT, R. J. (1988), Background selection by the peppered  moth (Biston betularia Linn.): individual differences. Biological Journal of the Linnean Society, 33: 217-232. doi:10.1111/j.1095-8312.1988.tb00809.x

 

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