301 



pigment marking the course of the anterior discoidal vein, 

 mentioned below (sub 2). Towards the hinder border, on the 

 contrary, the dark bar passes imperceptibly into the general 

 ground-colour of the wing-surface. 



By this difference between the two sides of the diagonal 

 bar, a contrast is brought about between the halves of the whole 

 Aving. The inner and hinder half shows a much darker aspect 

 than the outer and anterior one, though neither of these fields 

 is equally shaded over the whole of its surface. 



The anterior field darkens towards the apex of the wing, 

 which itself is again of a lighter hue ; the posterior field, on the 

 contrary, becomes lighter towards the base of the wing. 



2. The occurrence of a v-shaped dark figure on the discocellular 

 vein, which is the outer part of the black circuit-line bordering 

 the middle cell, next attracts our attention. The anterior 

 arm of this v forms a prolongation of the above-mentioned bar 

 up to the neighbourhood of the anterior edge of the wing. From 

 the outer side of the v four or five dark lines, marking the bases 

 of as many marginal veins, radiate towards the distal side. 



3. Two parallel series of light-coloured spots are arranged 

 transversely over the outer part of the wing-field. The outer 

 series marks the denticulated margin of the imaginai wing dis- 

 covered by PouLTON. Both series comprise nine or ten spots, 

 which are situated in the middle of the spaces between the veins. 

 The eighth and ninth form a pair, the distance between them 

 being shortened in consequence of the reduction of the first 

 anal vein, which passed between them. 



The inner series corresponds with the above-mentioned 

 submarginal spots of the primitive pattern on the developing 

 imaginai wings. 



A certain difference in size and form, which also occurs 

 among these latter, likewise may be observed among the pupal 

 spots. The anterior one, e.g., is larger and more oblong than 

 the following spots, but less sharply delineated ; the sixth and 

 seventh are larger than the preceding 2 to 5. 



At the inner or proximal side of the spots, three to i\ve 

 irregular figures of dark pigment are seen, reaching to near the 

 inner end of the marginal wing-cells, whose median area is 

 occupied bv tlu-ni. 

 46 



