436 Professor E. B. Poulton on 



five it is pale ochreous (as in Fig. 5a). In that one speci- 

 men out of the five in which spot (1) is the palest, the 

 spot within the cell (5) is of a pronounced ochreous tint. 

 Spot (5) is divided on the left side of one out of the three 

 individuals with the chief spot white : among the five 

 with the chief spot pale ochreous it is divided in two, and 

 on the left side in a third individual. Spot (4ft) is shown 

 on the upper but not on the under surface of the indi- 

 vidual represented on Plate XXIII, fig. 5a. It can only 

 be made out with a lens and on one side only in a single 

 specimen out of seven remaining ccnca. Excluding minute 

 traces revealed by the lens, spot (2«) is wanting from the 

 upper surface of all examples, but is present on the under 

 surface of one specimen out of the three and with the chief 

 spot white, and of two out of the five others. Other char- 

 acteristics of these eight specimens are considered in the 

 following sub-section : — 



Probable hereditary effects of the hippocoon form upon off' 

 spring of other forms. 



In all the three cenea offspring with the chief spot (1) in the 

 fore-wing white, tlie costal third of the ochreous basal patch 

 of the hind-wing becomes white, as is shown in Plate XXIII, 

 fig. 4a. The ochreous tint of the remainder of the patch 

 is also unusually pale. In the two individuals in which 

 this change towards the costal border of the hind-wing is 

 most marked, the chief spot of the fore-wing spreads out- 

 wards and downwards beycnd the first median nervule 

 (Fig. 4a). In all three examples there is a small ochreous 

 linear mark towards the base of the inner margin of the 

 fore-wing, thus very slightly extending the pattern of the 

 hind-wing on to the fore. 



In all the five eenea offspring with the chief spot (1) of 

 the fore-wing pale ochreous, this linear mark is also pre- 

 sent (Fig. 5a), but the extension of the chief spot is only 

 found in two of them. 



A whiteness towards the costal margin of the hind-wing 

 upper surface, like that of three cenca females, is found in 

 two of the males and on the left side of a third. There 

 is also a paling of the yellow on one side in the cell of 

 the fore-wing of a lew males which has more of an 

 abnormal appearance. The paling of the hind-wing, how- 

 ever, corresponds in position with that of the three cenea, 

 and is probably due to the same cause. 



