Seasonal Dimorphism in Buttcrjiies. 215 



22 ; emerged May 8. A dry-season male, of the 

 form acheloia, Wallgrn. (Fig. 4). 

 C2. Egg, March 24 ; hatched March 28 ; pupated April 

 24 ; emerged May 13. A dry-season male, like 

 Ci. 

 E. B. ilithyia, Drury. A wet-season female. Captured 



March 24, 1901. Laid 2 eggs. Offspring: — 

 Ei. Egg, March 24; hatched March 28; pupated April 



27 ; emerged May 19. An intermediate male. 

 These specimens supply complete proof, if proof were 

 wanted, of the specific identity of B. vulgaris, Stand, with 

 B. acheloia, Wallgrn., and also of B. ilithyia, Drury, with 

 the African form corresponding to B. simplex, Butl., of 

 India. It is to be noted that none of the bred B. ilithyia 

 are of the full dry-season form. One or two of them, how- 

 ever, approach it so closely as to leave no manner of doubt 

 that later in the year the typical " dry-season " colouring 

 would be developed. 



The following specimens of Terias sent home by Mr. 

 Marshall are also worthy of note : — 



Terias hrigitta, Cram. 



A. Malvern, Natal. Pupa in dry heat G days ; emerged 



April 4, 1897. A wet-season male. 

 This is no doubt one of the two T. Irigitta mentioned 

 above (p. 205) as having withstood an amount of heat 

 which proved fatal to Acrma eahiorc. 



B. Malvern, Natal. Pupa under normal conditions ; 



emerged April 9, 1897. A wet-season female. 



Terias se7iegalensis, Boisd. 



A. Salisbury, Mashonaland. Captured April 7, 1901. 

 (Figs. 9, 9a.) Laid 3 eggs. A wet-season female 

 of T. sencgalensis, Boisd. Offspring : — 

 Ai. Egg laid April 7; hatched April 11 ; emerged June 

 10. (Figs. 10, 10a.) A dry-season male, of the 

 form T. xthiopica, Trimen. 

 These two specimens are of great interest, as showing 

 that a T. hapale-like form ( T. ^thiopica) may be bred from 

 a T. hecabe-hke parent (T. sencgalensis) ; and as thus tend- 

 ing in some respects to confirm Mr. Marshall's view 

 expressed to Dr. Butler in 1898 as follows : — 



" You will notice among the Terias that I have pointed 



