Explanation of the Plates. 553 



PLATE VIII. 



Figs. 71 75 represent segments 8 and 9 of the larva 

 of Saturnia Carpini (German form) in dorsal aspect, all 

 at the fourth stage. The head of the caterpillar is sup- 

 posed to be above, so that the top segment is the 

 eighth. 



Fig. 71. Saturnia Carpini. Darkest variety. 



Fig. 72. Lighter variety. 



Fig- 73- Still lighter variety. 



Fig. 74. One of the lightest varieties ; the black 

 extends further on segments 9 and 10 than on the 8th. 



Fig. 75. Lightest variety. 



Figs. 7680 arc only represented on a smaller scale 

 than the remaining Figs, in order to save space ; were 

 they enlarged to the same scale they would be larger 

 than the other figures. 



Fig. 76. Saturnia Carpini (Ligurian form) ; Segment 

 8 ; Stage V. 



Fig- 77- Same form ; same segment in stage VI. 



Figs. 78, 79, and 80. Saturnia Carpini (German form) ; 

 dorsal aspect of 8th segment in Stage V. (the last of 

 this form). 



Fig. 78. Darkest variety. 



F'g- 79- Lighter variety. 



Fig. 80. Lightest variety. 



Figs. 8 1 86. Saturnia Carpini. (German form) ; Stage 

 IV. Side view of the 8th segment in six different 

 varieties. Fig. 81 shows only two small green spots at 

 the bases of the upper warts besides the green spiracular 

 stripes. Fig. 82 shows the spots enlarged and in- 

 creased by a third behind the warts ; the pro-legs have 

 also become green. 



Fig. 83. Two of the three green spots, which have 

 become still more enlarged, are coalesccnt. 



