Heredity in six families of Papilio dardcmus. 431 



taken into account, may be accepted as approximately cor- 

 rect^ 1 he numbers of Painlio dardcmus (of which nearly all 

 the Chmnda males possess the heavy black hind-win^ band 

 ot the E. subspecies, tihullus, Kirby, are as follows :— 



Males 24 



Females 



Hi'p'pocoon, f. . . . .22 



Cenca, f. . , . . ^ 



Tro2)honius, f. . . . , j 



_ Troplionius, mimicking Z). clirysippus, is thus rare, as it is 

 m Natal ; but, as regards the other two female forms the 

 proportions are reversed, hippocoon being predominant and 

 cenca rare. It will be of the highest interest to breed 

 Irom these female forms at Chirinda. There can be little 

 doubt that it would be found that hippocoon here pre- 

 dominates among the female offspring of a female parent 

 of any form, just as ccnea predominates in Natal. 



When we investigate the proportions of the Danaine 

 models at Chirinda we do not find that predominance of 

 the black and white species of Amauris which is sugc^ested 

 by the numbers of the hippocoon mimetic form ^ The 

 following results have been so far obtained, but a small 

 part of the collection still remains unexamined : 



The model of hipjjocooji — Amauris niavius, L., subsp. 



dominiccmus, Trim. .... 66 



The models of ce7iea(^'''^'''^^^' ^olengula, E. M. Sharpe 198 



^ „ alhimacidata, Butler . 152 



Ihe model of trophonius — Danaida chnjsippus, L. .109 



Amauris Idbcngula represents, and is probably a local 

 form of, A. echeria, Boisd., which is still unknown at 

 Chirinda. It is equally serviceable as a model for cenea. 

 In addition to dominieanus, 22 specimens of the smaller 

 black and white Aynauris ochlea, Boisd., were counted • 

 but the difference in the pattern is so great that it is un- 

 likely that the influence upon hip)pocoon is greatly affected. 

 Neglecting ochlea, the numbers of the Danaine model 

 of hippocoon are less than one-fifth of those of the two 

 models of cenecL Yet this small proportion is accompanied 

 by the immense preponderance of hippocoon revealed in 

 the figures quoted above. As bearing upon these inter- 

 esting and, in view of the effect produced, remark- 

 able proportions, Mr. Swynnerton tells me that lohengula 



