1876.] MR. A. G. BUTLER ON THE GENUS TERACOLUS. 127 



ber, until eventually we should be compelled to recognize but oue 

 species in the geuus, a consummation certainly not to be desired. At 

 present nobody doubts the existence of numerous species. Kirby's 

 Catalogue, which gives what is styled "the broad view," inasmuch 

 as it allows almost unlimited latitude for variation, enumerates 14 

 species under Idmais, 4 under Teracolus, and 53 under Callosune, 

 71 in all*. It being, therefore, impossible to be certain, without 

 careful breeding from the egg, of the limits of any species in this 

 genus, I have taken the only course open to me, and have described 

 all the forms which seemed, in both sexes, to present constant 

 distinctive characters, or which differed sufficiently, as single speci- 

 mens, to warrant the belief that they were not varieties of known 

 species. 



I. Wings sulphur-yellow or white, the apex of primaries dark, and 

 traversed in both sexes by pale spots : wings of male below 

 nearly uniform in tint, sometimes with a few black spots, of 

 female more or less tinted with buff, the disk crossed by an 

 irregular series of dark spots. Teracolus, Swainson. 



1 a. Wings of male uniformly yellow, apical patch of primaries black 

 internally ; apical spots confluent ; wings below greenish white ; 

 apex of primaries and secondaries reticulated with pale greyish 

 brown. T. subfasciatus, Swainson. 



1. Teracolus subfasciatus. 



Teracolus subfasciatus, Swainson, Zool. 111. Ins. ii. pi. 115 (1823). 

 "^ Anthocharis subfasciata, Boisduval, Sp. Gen. Lep. i. p. 567. n. 12 

 (1836). 



Ptychopteryx bohemani, Wallengren, Lep. Rhop. Caffr. p. 18 

 (1857). 



Damara Land (Trimen). B.M. 



1 b. A black streak on inner margin of primaries, broad in the male, 

 and uniting with a broad black outer marginal border. T. eris, 

 King. 



2. Teracolus eris. 



Pontia eris, Klug, Symb. Phys. pi. 6. figs. 15, 16 (1829). 



Pieris eris, Boisduval, Sp. Ge'n. Lep. i. p. 514. n. Ill (1836). 



Anthocharis eris, Reiche, Ferret & Galinier, Voy. Abyss. Ent. 

 p. 460, pi. 31. figs. 1-3 (1849). 



Idmais eris, Kirby, Syn. Cat. p. 499. n. 12 (1871). 



6 2 , Ambriz {J, J. Monteiro) ; d $ , S. Africa (£. C. Buxton). 



B.M. 



The ground-colour of the wings of the female is either white, as 

 in the male, or bright sulphur-yellow. 



* It should be observed that several species admitted in the above-mentioned 

 Catalogue are referred by Mr. Kirby to Pieris. 



