ART. 11 COMMON OLD WORLD SWALLOWTAIL BUTTERFLY — CLARK 13 



The hind whig is always narrow, though sometimes a little broader 

 than in the specimen figured. The indentations along the outer 

 border are usually less deep than in the specimen figured, and are 

 often slight (pi. 7, fig. 6). The tails vary greatly in length. They 

 are seldom so long as in the specimen figured (pi. 2), in which the 

 distance from the tip of the tail to the deepest portion of the scallop 

 just above its base is nearly one-third greater than the distance be- 

 tween the tips of the veins on either side of the tail. In a few 

 specimens the distance from the tip of the tail to the deepest part of 

 the scallop just above the base is considerably less than the distance 

 between the tips of the veins on either side of the tail (pi. 7, fig. 2), 

 and rarely the base of the tail is broadened (pi. 7, fig. 1) so that it 

 resembles the tail of P. 7n. hudsonianus as figured by Holland. 



The dark outer border of the wing sometimes touches the end of 

 the cell at the lower radial vein (pi. 5, fig. 6), and the section of 

 the lower radial between the end of the cell and the dark border is 

 in all the specimens except one from the Ramparts (pi. 5, fig. 3; re- 

 ferable to petersii; see beyond) markedly shorter than the dark bar 

 at the end of the cell between the lower and upper radials; in this 

 specimen it is only very slighth'^ shorter. The inner edge of the 

 dark border may be broadly and fairly evenly curved, as in the 

 specimen from the Ramparts just mentioned, or it may be only 

 slightly curved (pi. 5, fig. 1), or it may be broadly bowed in the 

 middle (pi. 7, fig. 6), or just below the middle (pi. 7, fig. 4), becom- 

 ing straighter at the two ends. In some specimens the inner edge 

 of the border is much more convex in the interspaces than it is in 

 others. The blue spots are usually somev/hat larger than in the 

 specimen figured, and may be considerably larger, almost touching 

 the lunules (pi. 5, fig. 1) ; they are usually well defined and rather 

 dense, but occasionally are poorly defined and obscure (pi. 7, fig. 1). 

 The submarginal lunules vary considerably in size ; they are usually 

 larger than in the specimen figured (pi. 2), sometimes much larger 

 (pi. 7, fig. 5) with broadly truncated ends. The dark abdominal 

 border is very extensive; the yellow triangle at its lower end with 

 its base resting on the black border of the ocellus is usually about 

 as long as the diameter of the ocellus, though it may be shorter 

 (pi. 5, fig. 2), and is often somewhat longer, rarely twice as long 

 (pi. 7, fig. 4), so that its apex is not far below the origin of vein Mi. 

 The anal ocellus is always light in color, with a blue metallic crescent, 

 usually rather narrow though sometimes broad as in the specimen 

 figured, separating it from the uniform and rather narrow black 

 band just above. In some specimens the crescent is indefinitely 

 edged beneath in its outer half with dark scales (pi. 5, fig. 6), and 

 rarely this indefinite edging is more or less complete, suggesting a 



