. A treatise on some of the insects injurious to vegetation . Insect pests. 408 LEPIDOPTERA. The last of these insects is the rubicwnda (Fig. 201) of Fabricius, or rosy Dryocampa. This delicate and very rare moth is found in Massachusetts in July. Its fore wings are rose-colored, crossed by a broad pale-yellow band; the hind wings are pale yel- low, with a short rosy band behind the middle; the body is yellow ; the belly and legs are rose-colored. It expands rather more than one inch and three quarters. The caterpillar is unknown to me.* All the Moth caterpillars thus far described in this wor
. A treatise on some of the insects injurious to vegetation . Insect pests. 408 LEPIDOPTERA. The last of these insects is the rubicwnda (Fig. 201) of Fabricius, or rosy Dryocampa. This delicate and very rare moth is found in Massachusetts in July. Its fore wings are rose-colored, crossed by a broad pale-yellow band; the hind wings are pale yel- low, with a short rosy band behind the middle; the body is yellow ; the belly and legs are rose-colored. It expands rather more than one inch and three quarters. The caterpillar is unknown to me.* All the Moth caterpillars thus far described in this work live more or less exposed to view, and devour the leaves of plants ; but there are others that are concealed from observa- tion in stems and roots, which they pierce in various direc- tions, and devour only the wood and pith; their habits, in this respect, being exactly like those of the JEgerians among the Sphinges. These insects belong to a family of Bomby- ces, by some naturalists called ZeuzeraDjE, and by others Hepialid.«s, both names derived from insects included in the same group. The caterpillars of the Zeuzerians are white or reddish white, soft and naked, or slightly downy, with brown horny heads, a spot on the top of the fore part of the body which is also brown and hard, and sixteen legs. They make imperfect cocoons, sometimes of silk, and sometimes of morsels of wood or grains of earth fastened together by gummy silk. Their chrysalids, like those of the Cerato- * Only one more North American Dryocampa is known to me. This moth was taken in North Carolina, and does not appear to have been described. It may be called Dryocampa tricolor, the two-colored, or gray and red, Dryocampa. The upper side of the fore wings and the under side of the hind wings are brownish gray, sprinkled with black dots, and with a small round white spot near the middle, and a narrow oblique dusky band behind it on the fore wings; the upper side of the hind wings and the under side of the f
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