|Third Instar #1 -
11 April 2015
Third Instar #1 - 11 April 2015
#2 Just After Molting to Fourth Instar
| Photo Details - ŠNicky Davis
Larva located by
Todd L. Stout 4, April 2015, 6600 foot
elevation, Bear Valley Jct, North side of Utah
Highway 20, .1 mile West of U.S. Highway 89,
Garfield County, Utah.
37°57' 56.44"N 112° 25' 1.17"W
Third instar #1 11 April 2015 - Feeding on
Third Instar #1 11 April 2015
Fourth Instar #1 18 April 2015 - 14 mm long
Fourth Instar #2 11 April 2015 - Minutes after
molt to Fourth Instar - 14 mm long.
#2 15 mm on 18 April 2015.
Both these caterpillars died using Penstemon
eatonii as host plant.
Todd Stout reared some of these on Penstemon
strictus then switched to Penstemon
eatonii. He was able to get 4 males
and 1 female through to adults. At Todd's
suggestion, I tried to get the adults to mate by
putting the males' antennae to the tip of the
female's abdomen to transfer pheromones which
has been reported as a strategy to get
butterflies to mate in captivity. Despite
doing this three times a day, the males and
female showed no interest in each other.
They were in a net cage with Penstemon eatonii
for a few days, then with Penstemon
strictus. Honey water was provided each
morning and evening and a container with a
sponge full of honey water in the container.