Western Sulphur, Larva - Colias occidentalis pseudochristina

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Characteristics & Utah Range Map

Scroll down for all photos of IMMATURES.  For other photos and information, click on

ADULT FEMALE      ADULT MALE     FEMALE ECLOSURE     MALE ECLOSURE      PUPA     SPECIMEN

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Ova
Oviposited on June 25, 2008
ovum laid on June 25, 2008
About to hatch on June 29, 2008
Ovum about to hatch June 29, 2008

Larva  Development
First Instar - 29 June 2008
lst instar
Second Instar - July 06, 2008
2nd instar
Third Instar - July 11, 2008
3rd instar

Third Instars hibernated all winter, were brought out on May 8, 2009 and molted to Fourth Instar on May 14, 2009

Fourth Instar Photos - May 15, 2009
Fourth Instar Photo on May 15, 2009

Fourth Instar on May 15, 2009

Fifth Instar Photos - Molted to fifth on 18 May 2009 - Photos shot on 21 May 2009
Fifth Instar

Fifth Instar

Fifth Instar Stripe variant
stripe variant

variant stripe

Photo Details - ©Nicky Davis
Located females at Strawberry Reservoir June 24, 2008. 
Elevation 7709 feet
Coordinates  North 40.09.85, West 111.11.517

Oviposited  June 25-27, 2008 some on lathyrus lanswardi but mainly Astragalus cicer. Eclosed in three to four days and were set on Astragalus cicer to feed.  Although they were kept in light 24x7, they all hibernated as third instar.  They were put in a refrigerator July 23, 2008 at about 40 degrees and after a couple of months were transferred to a refrigerator with freezing temperatures.  On May 8, 2009 they were taken out and placed on Astragalus cicer where they began feeding again.   May 14th  they molted to fourth instar.  On May 18, 2009 they molted to fifth instar.


Larva
Photos  of First through Third Instar in 2008 and the last two instars  in 2009.

Time spent
as ovum = 4 days
Larva=  about twelve days in 2008 and  about 18 days in 2009
Pupa =  7 - 8 days

Host
To see photos of the host plant used to feed these larvae, click  on

Astragalus cicer 

These can feed on Lathyrus Lanswardi, Thermopsis and Astragalus cicer.  They can't feed on hedysarum.


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