96 MR. R. TRIMEN ON BTITTERFLIES [Jau. 20' 



Oamatako (January). Nine examples ; seven males and two 

 females. 



Excepting two from the last-named locality, all these specimens 

 are rather small. 



86. PiERis SEVERiNA (Cram.). 



2 . Papilio severina, Cram. op. cit. iv. pi. cccxxxviii. if. G, H 

 (1781). 



Omrora (August) and Ehanda (August-September). Two male 

 examples. 



These two rather small males closely agree with the two from 

 Limpopo River, noted in my ' South-African Butterflies ' (iii. 

 p. 70), having the underside of the hind wings clear lemon-yellow 

 with the neuration almost without fuscous clouding. 



Genus HerpjEnia, Butl. 



87. HERPiENIA ERIPHIA (Godt.). 



Pieris eripliia, Godt. Encycl. Meth. ix. p. 157. no. 134 (1819). 



S. Pontia tritogenia, Klug, Symb. Phys. t. viii. ff. 17, 18 

 (1829). 



Ehanda (August-September), Humbe (October), Okavango River 

 (December), and Omaramba-Oamatako (January). Twenty-four 

 examples ; twenty-two males and two females. 



The Ehanda specimens (twelve males and a female) all belong to 

 the var. melaoiarge, Butl., in which the hind wings and the apex of 

 the fore wings are on the underside suffused with dull ochry-reddish 

 (in the paler parts with a carneous tinge). All the other specimens, 

 taken in three different localities from October to January, are of 

 the ordinary typical form ; and there thus appears some evidence for 

 thinking that the var. melanarge, met with only in August and 

 September, will prove to be a form of the species peculiar to the 

 cool or dry season \ The underside colouring is probably protective 

 during the parched state of the earth and herbage. 



Genus Teracolus, Swains, 



88. Teracolus subfasciatus, Swains. 



Teracolus subfasciatus. Swains. Zool. Iliustr. 2nd ser. iii. pi. 115 

 (1833). 



Omrora (August), Ehanda (August-September), and Omaramba- 

 Oamatako (January) . Fourteen examples ; thirteen males and one 

 female. 



These localities show a further range northward for this beautiful 

 species than was previously known, Ehanda being in about 16° S. 

 lat. The four male examples captured in August and September 



1 In Augola rain falls only during the hot season, from the end of October to 

 the beginning or middle of May (see Monteiro, ' Angola and the Eiver Congo,' 

 ii. p. 233) ; and I am informed that similar climatal conditions prevail in 

 Ovampo-land. 



