The Bionomics of South African Insects. 419 



the form aniilope were successfully reared from two of 

 these eggs. In the case of the first, shown on Plate XII, 

 fig. 8rt (under-side on Plate XIII, fig. 4<a), the egg 

 hatched on March 1, the larva pupated on April 10, and 

 the imago, a female, emerged on Ai:>ril 27. In the case 

 of the second, shown on Plate XII, fig. oh (under-side on 

 Plate XIII, fig. 4th), the egg hatched on March 1, the 

 larva pupated on April 14, and the imago, a male, 

 emerged on April 29. All three specimens have been 

 presented by Mr. Marshall to the Hope Collection at 

 Oxford. The great difference between the under-sides of 

 the two offspring (compare Fig. 4a with 4/'> on Plate 

 XIII) is deeply interesting. Although so widely differ- 

 ent, both equally resemble dead leaves, recalling the 

 various distinct forms of dead leaf represented by the 

 under-sides of the individuals of the same species of Kal- 

 lima. The difference between the outline of the wings in 

 parent and offspring is seen to be far greater in this species 

 than in sesamus and natalensis, aud archcsicc and pclasgis, 

 as will be at once seen when the figures on Plate XII or 

 Plate XIII are compared. 



Mr. Marshall's account of his success in obtaining the 

 material by which he proved the identity of aniilope and 

 simia, was received in the following paragraph of one of 

 his letters, 



" Salishury, Fch. 26, 1902. — I cannot even now agree with 

 Butler's arrangement of Precis antilope and cuaiiia. For 

 although their extreme forms appear to be very distinct, 

 yet all the chief distinctive characters are unstable and tend 

 to converge. Aurivillius agrees with me in regarding them 

 as conspecific, though he separates triineni and simia. A 

 pair of these latter I took in coindd last season, which is 

 sufficient evidence as to their identity in my mind, for I am 

 very sceptical as to interbreeding in a case such as this. 

 However, I have determined to solve the problem this 

 season, and since my return most of my time out-of-doors 

 has been spent in trying to secure authenticated eggs of 

 either summer form. Last Sunday I succeeded at last ! I 

 got nine eggs from a single simia, and they will probably 

 hatch to-morrow ; I hope I shall succeed in pulling most of 

 them through. All my larvae died in the first stage last 

 year, for owing to the erratic way in which the females 

 lay I could not ascertain the true food-plant, but I think 

 I have it all right this time. I expect to breed both 



