690 Mr. G. F. Leigh on Synej)igonic series of 



condition found in inaria. It is a well-known but not very 

 common variety, of which there are several examples in 

 the HojiO Department. Forty-one eggs were laid by this 

 female, and the larvae hatched on January 9 and 10. 

 They proved to be difficult to rear during the smaller 

 stages, when the larvse were often buried in the moist 

 faeces produced by the extremely succulent food-plant. 

 The surviving larvae were however quite healthy, and the 

 imagines with few exceptions of the normal size. The 

 results of the experiment are shown on preceding page 

 in a tabular form. 



Comparison of the Tndivichuds of tlic 1904 Synepigonic 

 Group of Hypolimnas misippus. By E. B. Poulton. 



Only a single female out of eight resembled the parent, 

 and even this was a less-pronounced variety. Of the rest, 

 four were typical misipp'iis, three typical inaria — one of the 

 latter indicating some slight approach in the direction of 

 the parent. 



Thus a tendency is revealed which if general must lead 

 to a gradual reduction in the numbers of the intermediate 

 varieties, and an increasingly abrupt break between the 

 misip2ms and inaria forms of female. In this instance the 

 intermediate variety had little power to impress its own 

 form on the next generation ; for seven out of eight of 

 its female ofispring broke up into the two well-known and 

 sharply-separated forms. Although the transition between 

 misip)2nis and inaria is far more complete than between 

 its models elirysippus and dorippiis i^ — ldugi%), in corre- 

 spondence with the fact that a combination of mimetic 

 forms must be younger than their models (Trans, Ent. Soc. 

 Lond., 1902, pp. 482-4), the mimic has nevertheless made 

 a considerable advance towards the abruptly-dimorphic 

 condition of the Danaine butterfly which it resembles. 



It is unnecessary to describe the male offspring which 

 were entirely normal in appearance, and as a rule in size. 

 The largest and smallest specimens are represented on 

 Plate XXXII, Fias. 7 and 8. E. B. P. 



