Heredity in six families of Pcqnlio dardamis. 433 



country and woodland species, while dardanus is a forest 

 insect. Model and mimic would ordinarily only meet at 

 the lines of contact between their respective types of 

 country. Both Mr. Marshall and Mr. Swynnerton to whom 

 I have mentioned this hypothesis agree that it probably 

 accounts for the fact. 



Section II 



Description of Families 4, 5 and G : Hereditary 

 tendencies in the details of the mimetic 

 patterns. 



The fore-wing spots of the cenca form. 



Before describing the details of these three families now 

 recorded for the first time, it will be convenient to enumer- 

 ate the spots of the fore-wing of the cenea form, of which 

 the five largest were described in 1904 (Trans. Ent. Soc. 

 Lond., 1904, pp. 680, 681). The terminology then sug- 

 gested will now be extended to include all the spots of 

 the fore- wing: — 



A. Spots arranged in a curve in part below and in part 

 round the distal end of the cell. 



(1) The principal spot (oval) : between veins 2 and 3. 



(2) An elongated spot : between veins 4 and 5. 



(2a) Rarely present (e. g. in Plate XXIV, figs. 20, 21) : 

 between veins 5 and 6. 



(3) Oval, but broader than (2): between veinsG and 7. 



(4) The blunt distal end is commonly emarginate : 



between veins 8 and 0. 

 (4a) Occasionally present (e. g. in Plate XXIV, figs. 

 14-19): between veins 9 and 10. 



B. The spot within the cell. 



(5) An irregular spot, with the inner extremity often 



cut off as a separate minute spot (e. g. in Plate 

 XXIV, figs. 1, 12, 13, 16, 17, &c.). 



C. The submargiual spots, of which four are usually 



present, 

 (a) At the anal angle ; generally minute : between 



veins 1 and 2. 

 (/3) Generally larger : between veins 2 and 3. 

 (y) Generally larger still : between veins 3 and 4. 

 (8) At the apical angle, generally largest : between 

 veins 7 and 8. 



