#3 Purged Excess Liquid and Began
Spinning Cocoon 9 July 2015
Cocoon with the dried Oak leaves
Pupae - Female 33 mm Long at Top
Shows Mark at Fourth Segment from Wing Case
Male 28 mm Long at Bottom
Shows NO Mark on Fourth Segment from Wing Case
Kevin Collison from Osceola, Polk County, Wisconsin
(elevation 825 feet) had a female polyphemus
mate May 31, 2015
and she oviposited on June 1, 2015.
I received ova on June 6, 2015.
Kevin advised that the
caterpillars hatch in about 6 days with
temperatures in low 90s, 24 days with
temperatures in the mid 60s and about 10 days in
the low 70s.
Ova - 10 days as ova
at 75 ° F
First Instar - Hatched 11 June
2015 - Three days as first instar (75°-78°) - 3
Second Instar - #3 Molted to 2nd instar 14 June
2014 - Four days as second instar - 6 mm long
Third Instar - #3 molted to 3rd instar 18 June
2015 - Five days as third instar - 12 mm
Fourth Instar - #3 Molted to 4th Instar 23 June
2015 - Seven days as fourth Instar, 19 mm long
26 June 2015 40 mm long
Fifth Instar - #3 Molted to 5th instar on 30
June 2015- 60 mm long at rest - 9-11 days as
Purged excess fluids and began silking
surrounding leaves to make a cocoon- #3 on 9
July 2015 (9 days as fifth instar), others at 8
days and 10 days as fifth instars.
Photo of cocoon with dried Oak leaves removed.
Photos of Female and Male Pupae. Female is
33 mm long and has mark on fourth segment from
wing case while the male is 28 mm long and has
no mark on the fourth segment.
Gambel Oak - Quercus gambelii
was used as the host plant
Birch (Betula), Willow (Salix)