. The Cambridge natural history. Zoology. HETEROJMERA CANTIIARIDAE = 71 devouring a couple of eggs, the triunguliu sheds its skin and appears as a different larva (Fig. 140, B), with soft skin, short legs, small eyes, and different form and proportions; a second moult takes place after about a week, but is not accompanied by any very great change of form, though the larva is now curved, less active, and in form like a larva of Scarabaeidae; when another moult occurs the fourth instar appears as a still more helpless form of larva (Fig. 140, D), which increases rapidly iu size, and when full gr
. The Cambridge natural history. Zoology. HETEROJMERA CANTIIARIDAE = 71 devouring a couple of eggs, the triunguliu sheds its skin and appears as a different larva (Fig. 140, B), with soft skin, short legs, small eyes, and different form and proportions; a second moult takes place after about a week, but is not accompanied by any very great change of form, though the larva is now curved, less active, and in form like a larva of Scarabaeidae; when another moult occurs the fourth instar appears as a still more helpless form of larva (Fig. 140, D), which increases rapidly iu size, and when full grown leaves the remains of the egg-pod. Fig. 140.—Hypermetamorphosis of JSpieauta vittata. North America. (After Riley.) A, Young larva or triungulin ; B, Caraboid instar or second larva ; C, ooarctate larva, or instar between the Scarabaeoid and Scolytoid larva ; D, Searabaeoid larva, from which the Scolytoid, or sixth, instar diilers but little ; E, pupa ; F, imago. it has been living on, and forms a small cavity near by; here it lies on one side motionless, but gradually contracting, till the skin separates and is pushed down to the end of the body, dis- closing a completely helpless creature that has been variously called a semi-pupa, pseudo-pupa, or coarctate larva (Fig. 140, C); in this state the winter is passed. In spring the skin of the coarctate larva bursts, and there crawls out of it a sixth instar which resembles the fourth (Fig. 140, D), except in the somewhat reduced size and greater whiteness. It is worthy of remark that the skin it has deserted retains its original form almost intact. In this sixth instar the larva is rather active and burrows about,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett), Sir, 1861-19
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
