4 PROCEEDINGS OP THE NATIONAL MUSEUM vol. 71 



Variation in the shape of the wings. — In the males the fore wings 

 are more or less produced (pi. 1, figs. 1, 2, 5, 6; pi. 2, figs. 15, 16; 

 pi. 3, figs. 19-22; pi. 4, figs. 25-32). From the apex the border runs 

 backward and outward, curving broadly around at the third submar- 

 ginal red spot and running thence in a straight (pi. 1, figs. 1, 2) or 

 slightly concave (pi. 4, figs. 26, 27) line to the inner angle. The 

 curve at the third red spot is usually well marked, and if the border 

 beyond is concave it may even be somewhat abrupt. Occasionally 

 this broad angulation of the fore wing is entirely lacking, and the 

 border curves smoothly from the apex to the fourth red spot, thence 

 running straight to the lower angle (pi. 3, fig. 23). Males of this 

 last type, with the fore wings relatively short and broad, are inactive 

 like the females from which they are not easy to distinguish either in 

 the field or in the cabinet. The most active males are the smaller 

 ones with the most produced fore wings (pi. 4, figs. 26, 27) . 



The shape of the hind wings in the males varies as much as that 

 of the fore wings. When the fore wings are markedly produced the 

 edge of the hind wings from the third red spot onward runs in a line 

 which is only moderately convex to the well-marked anal angle (pi. 4, 

 figs. 26, 27, 29). There are all gradations between this typical form 

 and hind wings which are evenly and broadly rounded, indistinguish- 

 able in shape from those of typical females (pi. 3, fig. 23; pi. 4, 

 fig. 31). 



The fore wings of the females (pi. 1, figs. 3, 4, 7, 8; pi. 2, figs. 9- 

 14; pi. 3, figs. 17, 18, 24; pi. 5, figs. 33-40) are relatively shorter 

 than those of the males, and are more rounded. From the apex (pi. 

 1, figs. 3, 4, 7, 8) the margin runs backward and outward curving 

 broadly around the fourth red spot and running in a slightly convex 

 line to the inner angle. Rarely the margm of the fore wings curves 

 regularly and evenly from the apex to the inner angle (pi. 5, figs. 33, 

 34). On the other hand, the fore wings of the females may be pro- 

 duced much as in the males (pi. 5, fig. 37), but in this case the maxi- 

 mum height of the convexity is at the fourth red spot instead of at 

 the third, and the margin between it and the inner angle is very 

 rarely concave. 



The hind wings of the females (pi. 1, figs. 3, 4, 7, 8) have an evenly 

 rounded border in the majority of cases, but rather frequently the 

 border beyond the third red spot is much less convex than normal 

 (pi. 5, fig. 33), so that the hind wings approach the form typical of 

 that of the male. 



In both sexes there is often a curious lack of correlation in the 

 form of the fore and the hind wings. In the males broadly and 

 evenly rounded hind wings are sometnnes found with strongly 

 produced fore wings (pL 4, fig. 31), while in the females broadly 



