222 CRAMPTON. 



in every way to the patches upon a cccropia wing, and differing 

 from anything normal upon a promethea wing. The upper sur- 

 faces of the posterior wings show also the mixed slate and 

 buff colors. There are no reds or browns, and there is no inner 

 "red line to the dark border of the wing. Below, the anterior 

 wings have the anterior portion reddish, the middle part black- 

 ish, and posterior part red, thus differing not markedly from the 

 normal. The posterior wings below are reddish, although with 

 a mixture of buff quite similar to the corresponding normal 

 pronictJiea wing. The body hairs are a deep reddish purple, 

 again a nearly normal color. 



From these details it will be seen that while the body and 

 the lower surfaces of the wings present a nearly normal appear- 

 ance, or at least a condition within the possible limits of specific 

 variation, nevertheless the upper surfaces of the wings present a 

 very great departure from the normal, and resemble very closely 

 the colors of a normal cccropia wing. The latter colors are ap- 

 parently outside the bounds of possible variation within the 

 species. And as the body cavity of the cccropia component lies 

 in this case in open communication with the body cavity of the 

 promethea, and thus to the wings, it may be inferred, I think, 

 that the colors in the wings of the promethea which resemble 

 the normal cccropia colors were produced by the presence and 

 decomposition of cccropia haemolymph where such colors ap- 

 pear in the promethea wings. 



This experimental production of a transfusion of haemolymph, 

 and subsequent color-effect of one moth upon another, is a 

 striking case in support of the conclusions arrived at by A. G. 

 Mayer from a study of normal phenomena. To the work of 

 Mayer, and to a lesser degree of some others, we owe our 

 knowledge that the pigmental colors of Lepidoptera are pro- 

 duced by the chemical decomposition of the haemolymph in the 

 empty scale cells. In this case the relatively small amount of 

 promethea haemolymph was without any effect upon the cccro- 

 pia ; while the more abundant haemolymph of the cccropia en- 

 tering the body of the promethea produced, by its presence and 

 disintegration, the colors of the cccropia in portions of the 

 wings of the promethea. 



