Pierine Butterflies of the Genus Terias. 81 



63. Terias alitha. 



Terias alitha, Felder, Wien. ent. Monatschr. vi. p. 289 (1862). 

 Terias invida, Butler, Ann. & Mag. Nat. Hist. ser. 5, vol. xi. p. 418 

 (1883). 



Philippines, Sula Islands. 



I believe T. alitha to be the wet-season form, though the 

 female shows an intermediate character of under surface, 

 and T. invida the dry-season form, although the male does 

 not differ on the under surface from that of the wet season, 

 and is only separable by the reduced width of the black 

 borders above. A very broad-bordered form occurs, of which 

 we have six examples from Samboangan and Davao, which 

 nray possibly be distinct, as well as a pair similar to the last 

 but with the yellow area of the primaries abbreviated. I 

 dare not venture, without proof of their distinctness, to name 

 these forms, all of which, if distinct, should have been named 

 by Mr. Semper in his Butterfly Fauna of the Philippines 

 (* Keisen im Archipel der Philippinen,' Band v.). 



64. Terias Lorquinii. 



Terms Lorquinii, Felder, Reise der Nov.. Lep. ii. p. 209 (1865). 

 Macassar, Celebes. 



A wet-season form. 



65. Terias zita. 



rf . Terias zita, Felder, Reise der Nov., Lep. ii. p. 210 (1865). 

 5 . Terias zama, Felder, /. c. 



Celebes, Ternate. 



The males in the Museum have a wet- and the female a 

 dry- season character of under surface; excepting in colour 

 they are alike in the pattern of the upper surface. 



66. Terias eumide. 



Terias eumide, Felder, Reise der Nov., Lep. ii. p. 214 (1865). 



Celebes, Batchian, Amboyna. 



We have seasonal types of this species ; but in the T. rahel 

 group generally there is something undecided about the various 

 phases of the species, which makes one doubt whether the 

 species of this group ever exhibit well-defined seasonal forms 

 such as exist in all the other groups of the genus ; possibly 

 they may be in a transitional stage towards extinction, for I 

 believe that they have not been developed by changes of tem- 

 perature, but have simply been adapted to them, inasmuch as 



