438 Professor E. B. Poulton on 



The ccncn 2^'^('}'cnt. — Tlie spots round the end of the cell 

 (l)-(4) are large and well developed, but neither (2a) nor 

 (4«) is present. The chief spot (1) is very jjale ochreous, 

 with a minute trace of a downward extension, as if slightly 

 in tlie direction of the pattern oi hippocoon and irojihonius. 

 The spot in the cell of the fore-wing (5) is distinctly 

 divided into two, making a I-like marking on the upper 

 surface : on the under this division does not occur. The 

 submarginal .spots of the fore-wing (a)-(8) are present 

 (although (a) is very minute) and increase in size to- 

 wards the apex. The parent is represented in Plate 

 XXIV, fig. 1. 



The fifteen male offspring. — These are as a whole much 

 darker and more closely approach the subspecies tihidlns 

 than the males of the other five families. The develop- 

 ment of the submarginal black band of the hind-wing is 

 clearly shown in Plate XXIV, figs. 2-G. The band is least 

 developed, with a pronounced anal gap (Trans. Ent. Soc. 

 Lond., 1904, p. G83) in No. 2G, represented in Fig. 2. 

 Next in succession follows No. 3, shown in Fig. 3. Then 

 follow two unfigured individuals, Nos. 1 and 30, succeeded 

 by No. 29 (Fig. 4). The next individual in the order of 

 increasmg heaviness in the black band is No. 28, unfigured, 

 and next No. 13, represented in Fig. 5. In this specimen 

 the costal gap in the band is indicated by a few scattered 

 yellow scales. No. 13 is the only individual in which the 

 gap is represented in this way, although it is more dis- 

 tinctly indicated by a bay, as in Figs. 3 and 4, or by an 

 angle, as in Fig. 5 itself. The darkness of the band in 

 this family and the gradual character of the transition 

 are seen in the fact that no less than seven unfigured 

 specimens intervene between the one represented in Fig. 5 

 and the darkest individual. No. 21, shown in Fig. 6. 

 Arranged in the order of increasing darkness these un- 

 figured specimens are Nos. 5, 2, 8, 15, 4, 19, and 11. The 

 specimen represented in Fig. 6 resembles a typical male of 

 tihullas from the tropical East coast, and indeed, as regards 

 the band of the hind- wing, the whole of the nine darkest 

 individuals of this family might have come from ]\Iombasa 

 or German East Africa. 



The remarkable serration of the inner border of the 

 black margin of the fore-wing — an ancestral feature 

 common in the males of this specialised subspecies, but 

 rarely found in far more primitive forms on the African 



