PLATE 1 



EXPLANATION OF FIGURES 



1 Larva of A. punctatum, kept at a low temperature (about 15°C. average) 

 in a dark room and fed on worms. It shows the first color stage (even yellow 

 brown). Cold worms, experiment 7; hatched on May 3, 1916; land condition 

 December 12. Photographed from live specimen October 25, natural size. 

 (Photo 16.) 



2 Larva of A. punctatum kept at a low temperature (about 15°C. average) 

 in a dark room. It shows the second color stage ('Network') at an advanced 

 stage. Cold worms, experiment 8; hatched on May 3, 1916; land condition No- 

 vember 14. Photographed from live specimen on October 25; natural size. 

 (Photo 14.) 



3 Larva of A. punctatum kept at a high temperature (about 25°C. average) 

 in a light room and fed on thymus. It shows the beginning of the third color 

 stage (separation of the network into yellow spots). The animal had 102 yel- 

 low spots when photographed. Warm thymus experiment 2; hatched on May 3, 

 1916; land condition October 19. Photographed October 9 from live specimen; 

 natural size. (Photo 2.) 



4 Larva of A. punctatum kept at a high temperature (about 25°C. average) 

 in a light room and fed on worms. It shows the third color stage ('Separation of 

 Network') in an advanced stage. The yellow spots are mostly faint and the sur- 

 face of the skin appears dull. Warm worms, experiment 2; hatched May 3, 

 1916; land condition September 29. Photographed from live specimen October 

 10; natural size. (Photo 5.) 



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