506 Mr. G. A. K. Marshall on 



agatlhina was fairly abundant, and I was interested to 

 notice the very close resemblance between it and Belenois 

 thysa, though, as is the case with most mimics, the latter 

 has a much quicker flight when disturbed. B thysa, so 

 far as my experience goes, is confined to the warm coast 

 belt, whereas M. agatlvina is common everywhere through- 

 out South-east Africa." 



" Mahxrn, ITarch 12, 1897. — It is curious to note that 

 although Ne'pheronia argia was common at the Karkloof, 

 I never saw a single specimen of Mylothris agathina. Mr. 

 Ball has in his collection a very fine variety of the female 

 of the former, which clearly mimics Mglothris trvmcnia, the 

 upper-side of the hind-wings being lemon-yellow, and the 

 reil mark on the under-side of the fore-wings absent. This 

 is the only one I have seen, although I took, one or two 

 females showing an approach towards it, one of which I 

 send you." 



" Umkomaas Mouth, Natal; Sept. 3, 1897. — I am afraid 

 I can hardly bring myself yet to believe in Dixey's theory 

 that the Picriniu are for the most part protected. As 

 regards our South African species, the only ones which I 

 feel confident are protected are Mylothris agathina, 

 rupioellii, and trimenia, and Pontia hellica. For the 

 remainder I think we must find some other cause to 

 account for their numbers and Avide range. In Terias tlie 

 larva possesses wonderfully assimilative colouring, and is ex- 

 tremely difiicult to detect on the food-plant, and so far as the 

 experience of Hutchinson and myself goes with T. hrigitta 

 we have never yet observed a single case of parasitism. 

 The protective coloration and comparative freedom from 

 parasites of the larva, and the protective seasonal colouring 

 of the imago, would no doubt go a long way to explain 

 their number, though I fancy there must be some other 

 factor." 



" Salisbury, May 1, 1899. — -Query : are the black bands 

 in the females of Teracolus acquired in mimicry of the 

 common and widespread species, Herp/^nia eriphia. i " * 



y. Papilioninm. 



" Salishury, Dec. 26, 1897. — Papilio hrasidcts I consider 



* Dr. F. A. Dixey informs me tliat Professor Westwood probably 

 suspected a relationship between the markings of H, eriphia and 

 T. eris, for he had removed a specimen of the former species froiii 

 the others, and placed it next to a dry form of the Teracolus. 



