Memoirs of the National Academy of Sciences . achptage, and I should hesitate to assume that the growth was always strictly proportional. In fact, I believe thatiu Nadata it is not so, for double growth seems to take jilace in the first stage. The measurement of tlio width of hi^ad is opeu to none of the above objections and possesses besides severaladvantages not shown by measurements of the of the larva. -Measurement not recorded. •This larva died before molting the last time. ?I From similar measurements made in the case of A, ijibhoan, I inferred that that species had more than six
Memoirs of the National Academy of Sciences . achptage, and I should hesitate to assume that the growth was always strictly proportional. In fact, I believe thatiu Nadata it is not so, for double growth seems to take jilace in the first stage. The measurement of tlio width of hi^ad is opeu to none of the above objections and possesses besides severaladvantages not shown by measurements of the of the larva. -Measurement not recorded. •This larva died before molting the last time. ?I From similar measurements made in the case of A, ijibhoan, I inferred that that species had more than sixstages (see Psyche, v. 6, p. 147), but this inference is not justified by the facts. It will be found, however, to haveoccasionally as many as six stages. ??^The series of widths of head as observed by me for Edema alhicosta were , , , , 2.,3, , and I havetwice attempted in the of Psyche to them tit a series iu regular geometrical progression, but without MEMOIRS OF THE NATIONAL ACADEMY OF SCIEXCES. 145. Pupa.—r>o(ly stdut ami thick, not taiieriiig imuli to tlie end. .Siirlacc of the alxlominalsegments moderately punctured, the two last segments quite smooth. The cremaster ends in aconical stout spine, broad at the base and shaip at the end, the point terminafirig in an unusualliind of armature which, seen from above or beneath, consists of four laterally ladiating, slightlyuiiturued, stout spinules, the lower ones considerably smaller than the distal ones. Length,2-2-23 mm. Habits.—The caterpillar is most commonly found on the oak. Dr. Harris found it on theoak, the moth occurring June 20. By the ndddle or last of September, in New iMigland (Maineand lUiode Island), it begins to pupate, nor spinning a cocoon, and jirobably entering the groundbefore assuming the chrysalis state. In Irovideuce it occurred on the white oak, in Maine on thered oak. In Georgia, according to Smith and Abbot, it feeds on the chestnut oak and otheroaks. It went
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