(16) Papilio hollandi, Edwards, Plate XL, Fig. 3, ♂ (Holland's Butterfly).
Butterfly.—This species or form, which belongs to the Asterias-group, in the breadth of the yellow spots on the upper side of the wings holds a place intermediate between P. bairdi and P. zolicaon, between which it has been suggested that it may be a hybrid, which has become fixed, and therefore a species. It is characterized by the fact that the abdomen is always striped laterally with yellow or is wholly yellow. Expanse, 3.25-3.50 inches.
Early Stages.—We know as yet but little of these.
The insect occurs in Arizona and northward to Colorado.
(17) Papilio asterias, Fabricius, Plate XL, Fig. 1, ♂; Plate II, Figs. 17, 24, 27, larva; Plate VI, Figs. 13, 18, 19, chrysalis (The Common Eastern Swallowtail).
Butterfly.—The male is well represented in the plate. The female lacks the bright-yellow band of postmedian spots on the primaries, or they are but faintly indicated. The species is subject to considerable variation in size and the intensity of the markings. A very remarkable aberration in which the yellow spots cover almost the entire outer half of the wings has been found on several occasions, and was named Papilio calverleyi by Grote. The female of this form from the type in the author's collection is represented in Plate XLI, Fig. 6. Expanse, 2.75-3.25 inches.
Early Stages.—The caterpillar feeds on the Umbelliferæ, and is common on parsley and parsnips in gardens. In the South I have found that it had a special liking for fennel, and a few plants in the kitchen-garden always yielded me in my boyhood an abundant supply of the larvæ.
P. asterias ranges all over the Atlantic States and the valley of the Mississippi.
(18) Papilio troilus, Linnæus, Plate XLI, Fig. 5, ♂; Plate II, Figs. 18, 19, 22, larva; Plate VI, Figs. 5-7, chrysalis (The Spice-bush Swallowtail).