Revision of the Genus Teracolus, Swazns. 333 
While the name was so used by Gray in 1831, it had been 
applied by him to the Barbastelle under the slightly different 
form Barbastella ten years previously. ‘Therefore it must be 
retained for the genus represented by that species. The 
synonymy is as follows :— 
BARBASTELLA, Gray, 1821. 
1821. Barbastella, Gray, London Medical Repository, xv. p. 300. 
Type Vespertilio barbastellus, Schreber. 
1839. Synotus, Keyserling & Blasius, Wiegmann’s Archiv ftir Natur- 
geschichte, v. Bd. i, p. 805. Type Vespertilio barbastellus, 
Schreber. 
The type species is therefore 
Barbastella barbastellus (Schreber). 
The specific name barbastellus is a masculine substantive, 
and does not change ita termination when combined with a 
feminine generic name. 
XLVII.—A Revision of the Species of Butterflies belonging 
to the Genus Teracolus, Swains. By ARTHUR G. BUTLER, 
nD E35, 7.5.5, Occ. 
Ir 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 
Weale (Trans. Ent. Soc. 1877, pp. 273-5) proved by experi- 
ment that 7. keiskamma and T’. auxo were produced trom 
exactly similar larvee and pupe found upon a Cadaba 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 Staff Corps, 
published an article on the synonymy of some species of 
Indian Pieride, in which he reduced the Oriental Teracoli to 
