. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE CELERY CATERMLLAR. 21 The larva.—The young stages of the larva are totally dissimilar to the mature ones. Five distinct stages are recognized, the second of which is illustrated at e, figure 5. This caterpillar is shown, lateral view, in figure 5, a. It is usually green, sometimes yellowish, and strongly ringed with velvety black and spotted as figured. Another caterpillar is shown at h to illustrate the appearance of the head and the peculiar yellow scent organs (osmateria). These are protruded when the inse
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE CELERY CATERMLLAR. 21 The larva.—The young stages of the larva are totally dissimilar to the mature ones. Five distinct stages are recognized, the second of which is illustrated at e, figure 5. This caterpillar is shown, lateral view, in figure 5, a. It is usually green, sometimes yellowish, and strongly ringed with velvety black and spotted as figured. Another caterpillar is shown at h to illustrate the appearance of the head and the peculiar yellow scent organs (osmateria). These are protruded when the insect is disturbed, and they exhale a pungent odor, similar to that of the bruised leaves of their food plants but of greater intensity and very disagreeable. The adult.—The parent insect is one of the swallowtail butterflies known by various names, but more commonly as the black swallow- tail. The ground color is velvety black, relieved by yellow bands in. Fig. 5.—The celery caterpillar {Papilio polyxenes): a, Full-grown larva, side view; 6, view showing head with extruded osmateria; c, male butterfly; d, egg in profile; e, young larva; /, suspended chrysalis; All about natural size, except d, which is much enlarged. (Original.) the male, as shown in the illustration (fig. o). The hind wings are ornamented on the inside by eyelike markings resembling those of the male peacock, and they terminate in the ''tails," from which the insect derives its common name. The female (fig. 6) is of larger size, somewhat faded black, and in every way of a more somber appearance than her spouse—a rule which holds good for most butterflies. Many of the yellow spots, particularly those arranged in the form of bands, are wanting, and the hind wings are ornamented with pale blue scales on the posterior half. This species is subject to every conceivable variation in color. The wing expanse is usually 3 inches or a little more. The chrysalis.—The chr^'salis is of a dull gra}^ color, mott
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