68 Dr. F. A. Dixey on the Relation of 



hjpera (Fig. 3), and compare it with that o^ Pierislocusta. 

 There is no difficulty in identifying the principal markings 

 as before enumerated. The yellow costal streak and 

 central area {e,f) and the anterior and posterior dark 

 shades {h, i) are present in M. hjpera as in P. locusta, all 

 occupying the same relative positions ; the precostal red 

 however has disappeared^ and the internal and median 

 touches of the same colour have united and prolonged them - 

 selves into a triangular streak reaching about a third of 

 the way across the wing (cd). A small dark area (g), 

 which in P. locusta lies immediately posterior to the internal 

 red patch, has in 31. hjpera extended itself in the same 

 direction with the extension of the patch, and has, beyond 

 the outer extremity of the latter, united with the anterior 

 dark area (i) in such a way as to completely surround the 

 red patch with a distinct region of black. All the areas 

 somewhat vaguely indicated in P. locusta have in M. 

 hjpera acquired a distinct and definite character with 

 sharply-marked, clear-cut borders. There is no doubt 

 of the homology of the markings in the two cases, nor 

 does the change from one to the other deserve to be 

 called either violent or abrupt. 



The underside of the male of M. lorena (Fig. 4) takes 

 us a step onward. Here are exactly the same features, 

 but with a further development along the same lines. 

 The red patch has now become a definite streak reaching 

 half-way across the wing, but still bears the same rela- 

 tion to the anterior dark area. The costal streak and 

 central area have undergone a similar elongation, and in 

 this instance are much paler in colour. The whole aspect 

 perhaps recalls that of P. phaloe rather than that of P. 

 locusta, and the correspondence with the former insect 

 is still further borne out by the presence of a diagonal 

 dark streak {Ic) in the forewing, part of which is indicated 

 in P. phaloe, uniting the costal with the posterior or 

 outer margin. 



The general streakiness of the male of M. lorena is 

 preserved or enhanced in the male of M. pijrrlm (Fig. 5). 

 There is in this case no diagonal dark band crossing the 

 forewing, but the red streak of the hindwing acquires 

 additional distinctness and importance, while the banded 

 appearance is further increased by a slight change in the 

 disposition of the enveloping black. 



As far as the hindwing is concerned, we have now 



