False Sphinx - Black-Rimmed Prominent
Pheosia Rimosa
Notodontidae - Prominent Moths


Immatures

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22 July 2015
ova


First Instar just after emerging from ovum - 25 July 2015
false sphinx


First Instar - 26 July 2015 - note eating pattern
1st


First Instar - 26 July 20151st instar


First  Instar - 27 July 2015
27 july


Second Instar - 28 July 2015
sphinx false 2nd instar


Second Instar - 28 July 2015
2nd instar


Third Instar  - 10 mm - 31 July2015
3rd instar



Third Instar  - 10 mm - 31 July 2015
3rd


Fourth Instar - molted 5 August 2015 - 37 mm
4th



Fourth Instar - close up of tail-end - 37 mm tail

#3 Fifth Instar - 50 mm long - 11 August 2015
5th instar


#3 Fifth Instar Head, Thoracic or True Legs
head and true legs


#3 Fifth Instar Prolegs
feet

Pupae
#1 and 2 larvae wandered off the plant
on 10 August 2015 and refused to feed

They were placed in containers with a
bit of sand and lizard litter in the bottom
where they pupated 12 August 2015
22-25 mm long

Female - Has mark on fourth segment from wing case

female


Male - Has no mark on the fourth segment from the wing case

male




Photos - ©Nicky Davis
22 July 2015 - I received ova from John Richards and friend Curt who caught the female using a mercury vapor light on 18 July 2015 near Bear River Station, Summit County Utah.

Emerged from ova 25 July 2015.  They refused willow but started to feed on aspen leaves.
Second Instar  28 July 2015

Molted to Fourth Instar 5 August 2015, 37 mm on 6 August

Pupae #1 - Larvae off plant 10 August 2015 and pupated 12 August 2015

Number of days at each stage
Ova - 3 days
First instars - 3 - 4 days - 
Second instars -  5 days -
Third instars - 4 days -
Fourth instars -  5 days -
Fifth instars - 5 days - 50 mm
Larvae moved off plant and refused to eat then burrowed into a  sand/lizard litter mix to pupate which takes 2-3 days.
Pupae 22-23 mm long - over winter as pupae

Host Plants reported
Willow
Aspen
Poplar

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