. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BEHAVIOR OF THE ANT-LION. 295 surface the imago emerges. In my limited experience I have noticed three methods of emergence. In one case the chrysalis protruded about half way out of the cocoon and the imago emerged from its back. In another case the chrysalis had left the cocoon entirely and protruded about half way out of the soil. In the third case both the head end and the tail end of the chrysalis remained within the cocoon and from its back the imago emerged. I am inclined to think the third case abnormal, caused by th
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BEHAVIOR OF THE ANT-LION. 295 surface the imago emerges. In my limited experience I have noticed three methods of emergence. In one case the chrysalis protruded about half way out of the cocoon and the imago emerged from its back. In another case the chrysalis had left the cocoon entirely and protruded about half way out of the soil. In the third case both the head end and the tail end of the chrysalis remained within the cocoon and from its back the imago emerged. I am inclined to think the third case abnormal, caused by the head of the chrysalis becoming entangled in some strands of the cocoon. Fig. 6 is a photograph of the cast skin of that chrysalis, made just after I had removed it from its cocoon. It seems to me that the other two cases may be explained as follows: when. Fig. 1 2 FIG. 12. One of the third pair of legs of an ant-lion larva. the cocoon is near enough to the surface for the chrysalis to expose the upper portion of its body without coming entirely out of the cocoon it does so; when the cocoon is a little deeper then the chrysalis leaves the cocoon entirely and continues upward until the anterior portion of its body is above the surface. When the cocoon is too far beneath the surface, the chrysalis dies on its upward journey. Fig. 5 is the photograph of such a chrysalis. It was found dead about half an inch below the sur- face. Attached to the bottom of the jelly-glass—about an inch below—the empty cocoon was found. Soon after emerging the imago undergoes an enormous increase in size. It soon becomes more than twice as large as the chrysalis from which it came, and this without partaking of food. Fig. 9 illustrates this. The jelly glass containing the cocoon had been tightly closed to prevent the possible escape of the imago when it emerged. It emerged at an unexpected time and when dis- covered it was dead. It had lost one antenna and its body was. Please note that these ima
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
