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Pomona College Journal of Entomology 



rate, twenty-two successive generations without crossing. To pair butterflies in 

 captivity, they need plentj' of sunsliine ; and to grow the food jjlant for the 

 caterpillars outside all the year around, needs a very mild winter, and we have 

 both here. My first female in this experiment I caught near Los Angeles on 

 April 2r>, 1909. It was very small, as are most of our butterflies which remain 



Figure 221. Junonia coenia 



A, normal; B, C, D, E, specimens inbred nndcr high temperatures. 



for a long time in the chrysalis ; the first generation bred in 90 degrees were all 

 somewhat larger, and I have kept up the size of this butterfly to the now twenty- 

 second generation. Of course they need the very best care; it is no easy task to 

 keep the food plant always fresh for a hundred or more caterpillars to eacli 

 experiment, without too much dampness in the breeding case, which will soon 

 prove fatal to the young caterpillars. 



