134 MR. A. G. BUTLER ON THE GENUS TERACOLUS. [Jan. 18, 



the base ; they could not constitute the genus Idmais even in a re- 

 stricted sense, inasmuch as Boisduval indicates /. calais as his type, 

 thus : — 



" Nous avions donne primitivement a ce genre le nom de Calais, 

 en prenant comme generique le nom de I'espece la plus connue ; 

 mais comme ce changement de nom specifique en nom generique 

 n'est pas sans inconvenients, uouslui avons substitue celui ^Idmais." 



For my part I see little utility in distinguishing a group so mani- 

 festly intermediate between the T. halimede and Calais groups, more 

 especially since the structural distinction is confined to one sex. 



6. Wings entirely orange or white above, loith black discocellular 

 spots in primaries, and a macidated black border, expanding in 

 primaries towards the casta, and more or less enclosing a series 

 of orange or white spots. 



26. Teracolus fausta. 



Papilio fausta, OUvier, Voy. dans I'Emp. 0th., L'Egypte et la 

 Perse, Atlas, pi. 33. figs. 4 a, b (1801). 



Pieris fausta, Godart, Enc. Meth. ix. p. 132. n. 41 (1819). 

 Pontia fausta. King, Symb. Phys. pi. 8. figs. 9-12 (1829). 

 Idmais fausta, Boisduval, Sp. Gen. Lep. i. p. 586. n. 2 (1836). 

 6 ? , Baghdad (TF. K. Loftus). B.M. 



Mr. Moore has this species from N.W. India. 



27. Teracolus Faustina. 



Idmais faustina, Felder, Reise der Nov. Lep. ii. p. 190. n. 187, 

 (1865). 



? 



The colouring of the underside differs from any thing that I have 

 seen ; the spots on the disk being lutescent or orange. 



28. Teracolus rosaceus, n. sp. (Plate VII, fig. 6.) 



(J . Wings above precisely like dark females of T. fausta, excepting 

 that the secondaries have a white patch above the subcostal nervure, 

 and the marginal black spots are linear : wings below pale creamy 

 yellow ; primaries with the discocellular spot small, lunate, black, 

 with light centre; apical border rosy, bounded within by six ill- 

 defined spots of the ground-colour, limited by an inner series of 

 decreasing spots, the upper four rustj'^, the lower two minute and 

 black ; secondaries with a pale-centred buff discocellular spot ; 

 seven discal spots in a J-shaped series, the first brown, the re- 

 mainder buff-coloured ; outer border rosy ; body below creamy- 

 white. Expanse of wings 1 inch 9 lines. 



Akote. Type, coll. F. Moore. 



The succeeding species is nearly allied, but seems to me to be 

 distinct. 



23. Teracolus oriens, n. sp. (Plate VII. fig. 7.) 

 cJ . "Wings above precisely like dark females of T. fausta, ex- 



