2 PAPILIO XII., XIII. 



a little yellow in the interspaces, of secondaries largely yellow, black at the ends 

 of the nervules. 



Under side pale yellow, the bands repeated, the submarginal 3ello\v spots of 

 primaries represented by a broad Avedge-shaped band ; the Ijlack ground antei'ior 

 to this occupied by a band of loose yellow scales ; on secondaries the correspond- 

 ing black ground is densely covered with similar scales, having along the anterior 

 edge a macular stripe of pale metallic blue ; the submarginal spots repeated but 

 enlarged, and the one at outer angle is a broad rectangular bar ; through the 

 black discal bar sometimes runs a blue streak ; in some examples there is a faint 

 fulvous discoloration on the yellow ground of secondaries, in median interspaces, 

 but as a rule, tliere is no trace of this. 



Body black above ; a yellow stripe from the head to the insertion of sec- 

 ondaries ; but often the black area is restricted to a narrow band from head to 

 end of abdomen; beneath, the thorax is yellow with two oblique black stripes; 

 abdomen yellow witli a lateral black stripe from insertion of secondaries to last 

 segment, and two stripes ventral. (Figs. 1, 2.) 



Female. — Expands fronr 4 to 4.8 inches. 



Upper side as in the male ; the blue scales in border of secondaries more dense, 

 and continued across the wing, presenting the appearance of a macular band ; 

 the spot at outer angle as in the male. (Figs. .3, 4.) 



The figures on Plate represent the summer bi'ood, and examples of this brood 

 from California and Washington Territory are nearly all ochrey-yellow, while 

 those of the spring are clearer. All examples observed from the Eocky Moun- 

 tains are less ochraceous than those to the westward. 



Var. ARizojfEXsis. 



Wings less falcate, the black bands heavy, the tails bent in, very little or not 

 at all .spatulate on inner side. (Figs. 5, 6.) 



Egg. — Sub-conoidal, base rounded and flattened ; surface smooth ; color deep 

 green. (Fig. a.) Duration of this stage ten to thirteen days. 



Young Larva. — Length .1 inch ; cylindrical, the anterior segments thickened ; 

 color dark brown, mottled black; on 8 a whitish patch, the width of the .«eg- 

 ment. rounded at the ends and taking in the sub-dorsal tubercles. l)ut descending- 

 the sides no farther ; this patch covers tlie posterior part of 7 also, and is there 

 broken into spots; an obscure light line runs the length of the body just under the 

 sul)-dorsal tubercles ; on dorsum of 2 are four minute tubercles, or mere points, 

 in two cross-rows, the front pair twice as far apart as those on 3, the other pair 

 outside these ; from 3 to 13 are two tul^ercles to each segment, close together, 

 and each of these points sends out one short hair ; the sub-dorsals are large on 

 2. 3, 4, 11, and 12, conical, pointed, witli one hair at apex and five about the sides, 



