PLATE 1 



DESCRIPTION OF FIGURES 



Photographs by Prof. Leland Griggs and Mr. Kenneth Robes, colored from 

 life by Prof. Adelbert Ames. 



1 Blue-green mutant caterpillar of Colias (Eurymus) philodice, — a recessive 

 to yellow-green. Xanthophylloid yellow blood pigment is suppressed by the 

 recessive factor. Note absence of pink lateral line as well as of the yellow com- 

 ponent of the green seen in figure 1 a. 



la Normal full-grown caterpillar of Colias (Eurymus) philodice. 



2 Blue-green pupa. 

 2a Normal pupa. 



3 Cast cuticula of blue-green pupa. 

 3a Cast cuticula of normal pupa. 



4 Blue-green eye of adult butterfly from a blue-green caterpillar. 

 4a Normal eye color. 



5 White cocoons spun by larvae of Apanteles flaviconchae, a parasitic brac- 

 onid, that had emerged from a blue-green caterpillar. Note the absence of 

 normal yellow pigmentation. X 1|. 



5a Bright yellow cocoons spun by larvae of the same species of braconid 

 that had fed upon, and emerged from, a normal yellow-green caterpillar. The 

 yellow color is probably due to xanthophylloid pigment in the hemolymph of the 

 host that is suppressed in the blue-green caterpillar. 



6 Adult braconid parasite of the caterpillar of Colias (Eurymus) philodice, 

 Apanteles flaviconchae Riley. X 18. 



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