On Species o/"Opistlioplithalmus. 233 



surface only varies in the number of white spots on the black 

 border. From what we now know of the seasonal dimorphism 

 of white butterflies, it is almost certain that the earthy-brown 

 and whity-brown types are dry-season forms and the yellow 

 and white types are wet-season forms. 



In like manner the two males of P. perimale^ which 

 Wallace regarded as an aberrantly variable species, represent 

 the ordinary dry- and wet-season forms, of the tirst of which 

 Donovan's type is typical. P. perimale^ however, is more 

 nearly allied to my Iluphina terranea, of which we now 

 possess both types from Lifu, than to Huphina lanassa. 



The synonymy of //. lanassa corrected to date will be as 

 follows : — 



Huphina lanassa. 



$. Pieris kmassa, Boisduval, Sp. Gt5u. Lep. i. p. 477 (1836). 

 (S 2 • i'leris 7iabis, Lucas, Kev. et Mag. de Zool. 1852, p. 326. 

 5 . Pieris perithea, Felder, Reise der Nov., Lep. ii. p. 169 (1865). 



Australia, Baudin Island, Fiji. 



Dry-season form. 



(S . Fieris 2iericka, Felder, Eeise der Nov., Lep. ii. p. 169 (1865). 



(S . Pieris narses, Wallace, Trans. Ent. Soc. ser. 3, vol. iv. p. 333, 

 pi. vi. tig. 3 (1867) ; Herrich-Sch after, Stett. ent. Zeit. 1869, p. 76, 

 pi. i. fig. 4; Auss. Schniett., App. p. 3, pi. i. fig. 103 (1869), as 

 jP. periclea. 



Australia, Baudin Island. 



In the wet-season form there are all gradations between 

 the extremes of yellow and white, whilst P. periclea is a 

 transitional form between the latter and P. narses ; therefore, 

 if the facts proved as regards the seasonal changes in colouring 

 in other genera of Pierina^ should be found not to be true of 

 llvphina^ the above forms would still have to be regarded as 

 variations of one species. 



XXX iV. — On the Species of the South- African Scorpion 

 Opisthophthalmus contained in the Collection of the 

 British Museum. By Ii. I. I'OCOCK. 



[Plate X.] 



Thanks to Prof. Kraepelin's recent examination and com- 

 parison of most of the types of Opisthop'dhalnius and his 

 Ann. cD Mag, N, Hist. !Ser. 6. Vol. xvii. IG 



