piepjx.t:. 185 



spotless greenish-white $ with a scarcely distinguisliable $, as well as 

 a pale sulphur-yellow $ with rusty-reddish marginal spots. 



These robust and strongly-made butterflies are very swift on the 

 wing, but their rapid and irregular onward flight is constantly inter- 

 rupted by settling on flowers. They are also found settled in numerous 

 drinking parties on the edges of streams and pools. As mentioned in 

 my introductory remarks (vol. i. \\ 31), the genus is famous for the 

 amazing assemblages of some of its members in onward migration ; 

 records of their steadily advancing hosts are numerous from both Old 

 and New World.^, and the solitary African species (which ranges 

 throughout the Ethiopian Eegion) is no exception to this remarkable 

 tendency. Like Tcrias, it inhabits all tropical and sub-tropical coun- 

 tries, extending also northward as far as Ohio in the United States and 

 Syria in the Mediterranean sub-region, and southward to Chili and the 

 Cape. 



The food-plants of the caterpillars in both hemispheres are Legumi- 

 iiosce, and nearly all of those known and recorded are species of Cassia. 



299. (1.) Oallidryas Florella, (Fabricius). 



? Papilio Florella, Tub., Syst. Ent., p. 479, n. 159 (1775); Ent. Syst., 



iii. I, p. 213, n. 666 (1793). 

 ^ and white 5. Colias Piirene, Swains., Zool. lUustr., ist Ser., i. pi. 51 



(1820-21). 

 S and 1 $ . CalUdryas Florella, Boisd., Sp. Gen. Lep., i. p. 608, n. 2 (1836). 

 $ Gallidryas Huhkea, Boisd., op. cit., p. 612, n. 7. 

 5 CalUdryas Rhadia, Boisd., op. cit., p. 617, n. 11. 

 $ ? (white). Callidrijas Florella, Trim., Bhop. Afr. Aust., i. p. 68, n. 45, 



and Note (1862). 

 $ CalUdryas Rhadia, Trim., op. cit., p. 69, n. 46. 

 ^ $ CalUdryas Florella, Hopff., Peters' Reise Mossamb., Ins., p. 365 



(1862). 

 $ Yar. CalUdryas Florella, Guen., Maillard, jSTotes Reunion (Bourbon), 



Lep., pi. 21, if. I, 2 (1862). 

 1^ $ CalUdryas Florella, Trim., Trans. Ent. See. Lond., 1S70, p. 382. 

 cJ $ (white). Callidryas Pyrene, Butl., Lep. Exot., p. 44, pi. xvi. ti". 8, 10 



[c?], 9 [? 1(1870). 

 $ CalUdryas Florella, Bull., op. at., p. 56, pi. xxii. i'^. i, 2. 

 ? Yar. Cato].mlia Aleurona, Butl., Ann. and Mag. Nat. Hist., 4th Ser., 



xviii. p. 489 (1876). 

 ? ?Var. Catopsilia rufosparsa, Butl., Ann. and Mag. Nat. Hist., May 



1880, p. 395. _ 

 CalUdryas Sicainsonii, Westw., App. Gates' Matabeleland, p. 335 (1881). 

 Pupa {West- African), Butl., op. cit., pi. xxii. f. 2a. 



Exp. al., {$) 2 in. 3-9 lin. ; ($) 2 in. 2-9I lin. 



$ Greenish-white. Fore-wing : a small narrow terminal disco- 

 cellular spot, variable in development (especially in length), but usually 

 well defined, and very rarely sub-obsolete ; an exceedingly narrow 

 faint reddish-brown edging on costa from beyond middle to apex, and 

 thence (broken into ill-defined nervular spots) along hind-margin as 



