Tag Archives: Alpine County

Hemileuca Larvae: Do Not Touch!

On a recent hike near Carson Pass in Alpine County, I encountered this critter crawling vigorously across a dry swale in the subalpine dwarf-shrub steppe at 8,900 feet.

Hemileuca heraHemileuca hera larva

It was about the size of my little finger and was about to disappear under an Eriogonum, so I coaxed it onto a stick and moved it to a large rock, where I took pictures while it resumed its ascent toward Red Lake Peak. The spines all over its body made it look about as fun to handle as a cholla cactus or porcupine, so I used the stick to prevent any direct contact.

That was a good thing, because on doing an image search in Google and checking further on Butterflies and Moths of North America and Bug Guide, I narrowed it down to Hemileuca hera, the Hera buck moth or Sagebrush sheep moth. The larvae of Buck moths and the related Io moths (both Saturniids) are well known for the extremely painful, persistent, burning, swelling stings produced when the spines inject their toxin into your skin.

Hemileuca habitatHemileuca hera habitat

An article on the University of Florida’s Featured Creatures site advises that “Not handling caterpillars that have spines is one of the best ways to avoid receiving stings.” Obvious, but sensible advice. Should you, however, inadvertently come into contact with one of these beautiful creatures, the wound should be treated by “washing the site immediately in order to remove any loose spines that might be present. The site should be allowed to dry without the use of a towel. Any remaining spines should then be removed with an adhesive such as duct tape. Finally you can apply ice packs to the site to relieve some of the pain.”

Hemileuca hera has been seen in the Mono Basin and it ranges across much of the Intermountain region, so it is likely to be present in the Bodie Hills. The larvae feed on sagebrush. The adults have striking white and black patterns on their wings.


Copyright © Tim Messick 2015. All rights reserved.

Mapping Monitor Pass

This is one of those posts about a place somewhat “beyond” the Bodie Hills. But there is a connection: when traveling to the Bodie Hills, I often travel across Monitor Pass, on State Route 89 in Alpine County, east of Markleeville. It’s a wonderfully scenic and botanically interesting area — one of my favorite places along the route to Mono County. Earlier this year I started making a map of the Monitor Pass area (during some spare hours at the office) as a way of getting to know the area better.

Monitor Pass and Vicinity, from Markleeville to Topaz (click to enlarge, back to return):

Monitor Pass and Vicinity

But then the Washington Fire happened. According to InciWeb, the fire incident information system, it was ignited by lightning sometime in early June, but remained small and undetected until June 19, 2015. Between then and the first week of July, nearly 17,800 acres of pine forest and sagebrush scrub burned in the East Fork Carson River watershed between Markleeville and Monitor Pass. Nearly 1200 personnel worked hard to bring the fire under control. They prevented damage to the small city of Markleeville and many nearby recreational sites. Remarkably, they got the  Monitor Pass and Ebbetts Pass roads open and safe to use in time for the annual “Death Ride” on July 11 — a grueling, high-profile, high-altitude cycling event with 5 mountain pass ascents over a course of 129 miles.

So my map of a favorite driving route turned into a fire history map of the Monitor Pass area. I downloaded the final perimeter of the Washington Fire (a KML file available from InciWeb). Then I found a statewide fire history geodatabase from the California Fire and Resource Assessment Program (FRAP) that maps incidents as far back as 1878, though the earliest fire mapped in the Monitor Pass area is 1941.

Fire history map of the Monitor Pass area (click to enlarge, back to return):

Monitor Pass Area Fire History

Fires have very long-lasting effects in this region of steep, arid topography. Pines, junipers, sagebrush and other large woody shrubs take many decades to recover even to a fraction of the cover that was present before a large fire. Areas that burned east of Monitor Pass in 2004 still have little woody vegetation. Areas that burned in the ’70s, ’80s, and ’90s are still clearly visible from the air, in Google Earth, or on the ground. Vegetative biomass and the wildlife habitat it provides takes a very long time to recover.

Washington Fire

Washington Fire burn area, near Heenan Lake, 7/12/2015

Washington Fire

Washington Fire perimeter, near Heenan Lake, 7/12/2015

The maps were compiled in Adobe Illustrator with the Avenza MAPublisher plug-in from GIS data available on the internet. The shaded relief background was created in Adobe Photoshop with the Avenza Geographic Imager plug-in and digital elevation data available from USGS.

MarkleevilleAfter the fire, in Markleeville


Copyright © Tim Messick 2015. All rights reserved.