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Updated: July 19, 2025
In this way they have changed the superficial character of the soil over great areas; we may say, indeed, over a large part of the earth, and this in a way which fits it better to serve the needs of the wild plants as well as the uses of the farmer. Many thousand species of insects, particularly the larger beetles, have the habit of passing their larval state in the under earth.
The recognition of these facts has a distinct bearing in the methods adopted to prevent the spread of yellow fever. There are no striking characters or habits in the larval or pupal stages that would enable us to distinguish without careful examination this species from other similar forms with which it might be associated.
In most cases the males and females of distinct species will have been exposed during their prolonged larval state to different conditions, and may have been thus affected; though with the males any slight change of colour thus caused will generally have been masked by the brilliant tints gained through sexual selection.
But others display signs of sex differentiation that are to be traced back to an awakening interstitial gonad action. Some boys have no interest whatever in sex. Others will show an intense curiosity spontaneously, a curiosity which perhaps may be explained as a larval precocity, dependent upon the minimum of sex hormone production by the gonads.
Here one might quote Laura A. once more, whose resistiveness when stuporous was intense but who in her manic spells expressed her negativism in a definite idea, “I don’t want my face washed.” To summarize, then, we may say that negativism is apparently the result of a desire to be left alone, and that muscular resistiveness is a larval exhibition of the same tendency.
Like nearly all insects, the young wasp is born in the larval state, and from the moment of its hatching to the end of its growth that is to say, for a period of many days the grub enclosed in its cell can look for no help from without.
Even the formation of the "primitive band," usually the first indication of the organization of the germ, is postponed to a comparatively late period in larval life. Thus some portions of the animal are accelerated in their development more than others, while others are retarded, and in some species certain organs are not developed at all.
This time the problem of the victuals is solved. When I compare the larval slough sticking to the Scolia's cocoons with the Cetonia-larvae or, better, with the skin cast by these larvae, under cover of the cocoon, at the moment of the nymphal transformation, I establish an absolute identity. The Two-banded Scolia rations each of her eggs with a Cetonia-grub.
Among the worst enemies of both ova and fry is the Dytiscus marginalis, whether this insect be in the larval or adult stage. I think that I should hardly be wrong in going even further and saying that D. marginalis is very dangerous to trout early in their yearling stage. The accompanying illustration shows a larva of Dytiscus which has caught a young trout.
This emotional attitude was quite conscious with her, whereas the acts and speech of the earlier period, when her stupor was more profound, seemed more automatic and impulsive. In other words, the resistiveness looks like a larval attempt to express an idea which is probably not fully conscious and therefore gives the appearance of being aimless.
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