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 supposed 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. 76-80 are 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.

Fig. 79. Lighter variety.

Fig. 80. Lightest variety.

Figs. 81-86. _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 increased 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 coalescent.

Studies in the Theory of Descent (Volumes 1 and 2) · 第 139 / 186 题