In this experiment the author wished to see as exactly as possible--First, in what points changes would occur. Second, if there would be any change in the shape of the wings, as well as in markings or coloration--that is, whether the shape might remain as that of _Marcellus_, while the markings might be of _Telamonides_ or _Walshii_; a summer form with winter markings. Third, to ascertain more closely than had yet been done what length of exposure was required to bring about a decided change, and what would be the effect of prolonging this period. After the experiments with _Phyciodes Tharos_, which had resulted in a suffusion of colour, the author hoped that some similar cases might be seen in _Ajax_. The decided changes in 1878 had been produced by eleven and sixteen days’ cold. In 1877, an exposure of two days and three-quarters to eight days had failed to produce an effect.
From these chrysalides 11 perfect butterflies were obtained, 1 male and 10 females. Some emerged crippled, and these were rejected, as it was not possible to make out the markings satisfactorily.
1 female between _Marcellus_ and _Telamonides_. 2 females, _Marcellus_.
These 2 _Marcellus_ were pale coloured, the light parts a dirty white; the submarginal lunules on hind wings were only two in number and small; at the anal angle was one large and one small red spot; the frontal hairs were very short. The first, or intermediate female, was also pale black, but the light parts were more green and less sordid; there were 3 large lunules; the anal red spot was double and connected, as in _Telamonides_; the frontal hairs short, as in _Marcellus_. These are the most salient points for comparing the several forms of _Ajax_. In nature, there is much difference in shape between _Marcellus_ and _Telamonides_, still more between _Marcellus_ and _Walshii_; and the latter may be distinguished from the other winter forms by the white tips of the tails. It is also smaller, and the anal spot is larger, with a broad white edging.
1 female _Marcellus_, with single red spot.
1 female between _Marcellus_ and _Telamonides_; general coloration pale; the lunules all obsolescent; 2 large red anal spots not connected; frontal hairs medium length, as in _Telamonides_.