PAPILIO VI. 
or four anterior segments edged with black dorsally, and the remainder by a 
dusky shade, not always present; along the under side of the body is a dusky, 
broken, median line ; head small, obovate, pale bluish-green, yellowish in front, 
with two frontal black stripes and three black dots ; the ocelli black; the re¬ 
tractile horns on second segment orange. Mr. Henry Edwards states that the 
mature larva varies, the transverse bands in many cases becoming very broad, 
and the yellow spots on some of the segments obsolete; in other cases the whole 
upper surface is pale green, with very faint black bands, the yellow markings 
considerably larger than the average. According to this author, the larvae feed 
upon various species of umbelliferae, but particularly upon fennel, Foeniculum 
vulgare. In confinement, they will feed readily upon carrot or celery. There 
appears to be but one brood, the larvae being fully fed about the middle of Sep¬ 
tember, and the butterfly appearing in the following May. For the drawing of 
the larva copied on the plate, I am indebted to R. H. Stretch, Esq. 
Chrysalis. — Length 1.2 inch, greatest breadth .36 ; shape cylindrical, thickest 
at sixth and seventh segments, tapering gradually toward the head, rapidly toward 
last segment; the surface rough; the palpi cases prominent, pyramidal, corrugated; 
mesonotum pyramidal, as are also the ocellar projections ; all these processes 
deep black; a row of black tuberculated points on back of abdomen and one on 
either side, the three rows converging at extremity ; color fawn, shading into 
black at the sides and on dorsum, and mottled irregularly on the front with 
same color. The chrysalis is also subject to much variation, some examples 
being almost wholly black, with shadings of fawn color, while others lose the 
black altogether and are fawn color, with pale brown markings. 
Zolicaon belongs to the Machaon group, and inhabits the Pacific slope from 
Vancouver’s Island to Lower California, and is found inland at least as far south 
as Arizona, as I have received specimens from Lieut. Wheeler’s expeditions to 
that region. I have had it also among the collections made by Dr. Hayden’s 
expeditions in Idaho and Montana. It is rare in Colorado, according to Mr. 
Mead, who took but three or four specimens in his explorations of 1871. And 
Mr. H. Edwards states that is by no means a common species in Oregon or Van¬ 
couver’s Island, and he has never met with it in the higher sierras of California, 
but that throughout this State it is abundant in the valleys and foot-hills. 
