466 Dr. A. G. Butler on Pierine Butterflies. 



27. Tachyris andrea. 



Colias andrea. Esclischoltz, Kotzeb. Beise, iii. p. 215, pi. xxiii. a, b 

 (1821). 



Philippines. $ ? , B. M. 



The males of this form differ very little from those of 

 T. hippo, but the females have a decidedly broader dark outer 

 border to the secondaries; what I regard as probably the dry- 

 season form has also a much purer white ground to the wings 

 on both surfaces. 



28. Tachyris hippo. 



2 ■ Papilio hippo, Cramer, Pap. Exot. iii. pi. cxcv. B, C (1782). 



j. Pieris eleonora, Boisduval, Sp. Gen. Lep. i. p. 481 (1836). 



$ . Appias vacans, Butler, Trans. But. Soc. 1870, p. 490 ; Lep. Exot. 



p. 90, pi. xxxiv. tigs. 5, 6 (1872). 

 S • Appias hippoides, Moore, Trans. Ent. Soc. 1881, p. 312. 

 Appias epiccena, Swinhoe, P. Z. S. 1889, p. 398. 



N.E. Jndia, Pegu, Burma, Tonkin, Malacca, and Penang. 

 B. M. 



Our series is represented by sixty-eight examples, showing 

 every possible gradation between the extreme wet form 

 T. hipjwides and the extreme dry form T. epiccena. The 

 Indian forms have the subapical spot on the under surface of 

 the male primaries bright yellow ; in Pegu, Burma, Malacca, 

 and Penang this spot is sometimes bright or pale yellow, but 

 much more frequently quite white. 



29. Tachyris taprobana. 



Appias taprobana, Moore, P. Z. S. 1879, p. 143 ; Lep. Ceylon, i. pi. Iii. 



figs. 1, la, b, c. 

 Appias aperta, Butler, Ann. & Mag. Nat. Hist. ser. 5, vol. xviii. p. 188 



(1886). 



Ceylon. B. M. 



I regard T. aperta as the dry form of T. taprobana. The 

 species stands between T. hippo and T. enarete, the costal 

 and subcostal veins on the under surface of the secondaries 

 being blackened, though less prominently than in T. enarete. 



30. Tachyris enarete. 

 Pieris enarete, Boisduval, Sp. Gen. Lep. i. p. 480 (1836). 

 Borneo. 15 <J, G ?. B. M. 



31. Tacliyris lati/asciata. 

 Appias lati/asciata, Moore, Trans. Ent. Soc. 1881, p. 312. 

 Kollar, Kilghiris. 5 J . B. M. 



