Memoirs of the National Academy of Sciences . e leaf late in summer or in the autumnwhen portions begin to wither and to turn brown. Hence the horns, if present, would then onlyserve to attract attention to it, and thus they are modified into nuudi less prominent tubercles. Itshould be observed that in the full-grown larva of R. astarti; which has the same general colors andmarkings as H. guttivitta and H. Uundata, and is thus protected, the prothoracic tubercles areabsent. How to account for the appearance of such enormous horns may be impossible even after wehave become acquainted with the e
Memoirs of the National Academy of Sciences . e leaf late in summer or in the autumnwhen portions begin to wither and to turn brown. Hence the horns, if present, would then onlyserve to attract attention to it, and thus they are modified into nuudi less prominent tubercles. Itshould be observed that in the full-grown larva of R. astarti; which has the same general colors andmarkings as H. guttivitta and H. Uundata, and is thus protected, the prothoracic tubercles areabsent. How to account for the appearance of such enormous horns may be impossible even after wehave become acquainted with the early stages of all the allied species, though it should be bornein mind the young of Citheronia re«.—Body plump; of the same shape as in E. guttivitta. Head full and rounded, with thetwo parallel ridges between the eyes slightly larger and more prominent than in JI. guttivitta MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 241. ;(which shows that in this as well iis iu Schiziira and perliaps sonu; other genera of Notodoutidie there may be useful specitic characters iu the front of the head). Other differences may be seeu by comparing our camera drawings with flg. 82. The vestiges of the 9 sexual aperture aie oval, and shorter than in H. fiiitttvitfa. Behind the .mesoscutuiu the dark transverse line or band usually present is formed of six black tubercles (these iu my single specimen may be somewhat deformed in this respect and not entirely normal), which are not square, but veiy short and transversely oblong, but otherwise as hi //. (/uttiritta. Length, 18-19 mm. Habits.—The habits and distribution of this species are very similar to those of IT. guttivifta. In Providence the larva in the second stage occurred July 1, and the fully fed larva occurs as late as September 10. In Maine I have found larv;e 10 mm. iu length feeding on the rock majjle July 21, and the fully developed caterpillars occur there late
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