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Pale Swallowtail (Papilio eurymedon)

  • July 23, 2021

The Pale Swallowtail is the only whitish (off-white to rich oucre) and black swallowtail in the west and flies mainly in... Continue Reading

American Hornet Moth (Seisia tibialis)

Delicious or dangerous? Many predators would pass on these day-flying moths …and many people would be wary in their presence. In fact, the... Continue Reading

Deer Fly (Chrysops asbestos)

Glenn sacrificed a little blood in his effort to snap this photo. Most female horse flies or deer flies (family Tabanidae) feed... Continue Reading

Notes from the Lab: Like a Moth to a Flame

  • July 22, 2021

Welcome back to the Lab! And happy National Moth Week! In celebration of our nocturnal (and diurnal!) lepidopterans, let’s explore one of the most... Continue Reading

Rocky Mountain Parnassian (Parnassius smintheus)

  • July 16, 2021

Parnassians are part of the swallowtail family (Papilionidae), but don’t look like the typical bold, black and yellow or white-winged ones. They lack tails... Continue Reading

Thick-headed Fly (Physocephala burgessi)

At first glance, you might think this little insect is a type of wasp. But look at those stubby antennae (coming... Continue Reading

Arctic Skipper (Carterocephalus palaemon)

Like most skippers, the adult butterflies rest with their wings closed, but you can often find them basking in the sun... Continue Reading

Tortricid Moth in the genus Choristoneura

We believe this is likely the Western Spruce Budworm Moth (Choristoneura occidentalis). It is common in forests throughout the Rocky Mountain... Continue Reading

Bagworm Moth Larval Case (family Psychidae)

Bagworm moth larvae spend most of their lives inside a “bag” or case. Made of silk and covered with bits of plant material... Continue Reading

Northern Blue (Plebejus idas)

If you’re trying to identify a “blue” (subfamily Polyommatinae) make sure to get a photo of their underside, where most of their... Continue Reading