Heredity in six- families of Papilio dctrdanus. 439 



continent * — is well seen in Fig. 6, less characteristically 

 in Fig. 2. Half of the unfigured specimens also exhibit 

 the same feature, while the others resemble the condition 

 represented in Figs. 3, 4, and 5. 



The sixteen ecnca offspring. — All the females of this form 

 are shown in Plate XXIV, with the exception of No. 25 

 which is so deformed that the pattern cannot be made 

 out. They are arranged in three sets according to the 

 number of the white spots grouped round the end of the 

 fore-wing cell on the upper surface. The seven speci- 

 mens represented in Figs. 7-13 on Plate XXIV possess 

 tlie four usual spots (l)-(4) seen in the parent; the six 

 represented in Figs. 14-19 have the additional spot (4a) 

 on the costal and inner side of (4) : the two represented 

 in Figs. 20 and 21 have the additional spot (21-/) between 

 (2) and (3). A glance at the plate will show that the 

 extra spots (4ff) and (2(f) tend to occur in individuals in 

 which spots (l)--(4) are strongly developed, the only 

 apparent exception being offered by Fig. 14. The spots 

 of the fore-wing are large and well developed — about equal 

 or even superior to those of the female parent — in the cc7iea 

 offspring represented in all the Figures except 7, 8, 11, 

 and 14. 



As regards the development of a pale ochreous tint in the 

 spots of the fore-wing, all the ecnca forms figured are 

 nearly in the condition of the parent except that shown 

 in Fig. 9. In this specimen. No. 32, spots (1) and (3) are 

 of an ochreous tint as deep as that of the hind-wing patch, 

 while parts of spots (2) (4) and (5) also bear yellow 

 scales. The specimen is, in fact, in this respect a good 

 mimic of the Cape Colony forms of Amavris echeria. 



Of the remaining ecnca, spot (1) is whitest in the speci- 

 mens shown in Figs. 11 and 15. Spot (3) as well as (1) 

 is very pale ochreous in Fig. 16. A slight downward and 

 outward extension of spot (1) in the direction of the 

 pattern of ]ii2:)pocoon is developed much as in the parent in 

 the specimens represented in Figs. 9, 10, 11, 14, 17, 19, 

 and 21. It is considerably more developed in Fig. 18. A 

 small pale mark on the basal part of the fore-wing inner 

 margin — a furtlier advance towards hippocoon, etc., not 

 found in the parent — is seen in the specimens shown in 

 Figs. 10, 11, 14, 19, 21, and in a far more advanced state 

 in Fig. 18. 



* Trans. Ent. Soc. Lond., 1906, p. 282. 



