Revision of the Genus TcracoUis, Sicains. '^S5 



Wliile tlie name was so used by Gray in 1881, it liad been 

 applied by liiin to tlie Barbastelle under the slif^htly different 

 form Barbastella ten years previously. Therefore it must be 

 retained for the j^enus represented by that species. The 

 synonymy is as follows : — 



Barbastklla, Gray, 1821. 



1821. Barbasfj-lla, (tray, London Mediciil Repository, xv. p. .300. 



Type Vesperfi/io harhnntdtii.'i, Sclireber. 

 1839. Si/notiis, Keyseiliii;,' & Blasius, Wioj.'-niann'd Archiv fiir Natur- 



peschirlito, v. lid. i. p. -iOo. Type Vespertilio bnrhastellns, 



Sclireber. 



The type species is therefore 



Barhastella harhastellus (Sebrcber). 



The specific name barbasteUus is a masculine substantive, 

 and does not cliange its termination when combined with a 

 feminine generic name. 



XLVII. — A Revision of the Species of Butterflies hdonging 

 to the Genus Teracolus, Sicains. By A.RTHUR G. Butlek, 

 Ph.D., F.L.S., F.Z.S., &c. 



It is now upwards of twenty years since I first essayed a 

 Monograph of this most attractive group of Pieridine Rhopa- 

 locera, and horrified my old friend Hewitson by adding nearly 

 fifty species to those already described. Since that date 

 many beautiful new forms have been received from various 

 parts of Africa and from Arabia. 



Until quite recently the variation of the species of Tera- 

 colus has been but little studied, very few facts bearing upon 

 the seasonal modifications of the different forms having been 

 published. It is true that so far back as 1877 Mr. Mansel 

 AVeale (Trans. Ent. Soc. 1877, pp. 273-5) proved by experi- 

 ment that T. keisTcamma and T. auxo were produced from 

 exactly similar larvae and pupse found upon a Gadaha bush 

 in autumn and spring, and he suggested that they were 

 variations influenced by the amount of moisture at the season 

 of their emergence. This suggestion, however, was received 

 with a good deal of scepticism. 



In vol. viii. of the ' Journal of the Bombay Natural History 

 Society ' Capt. E. Y. Watson, of the Indian StaflP Corps, 

 published an article on the synonymy of some species of 

 Indian Pierid^e, in which he reduced the Oriental Teracoli to 



