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The labium is not developed from a pair of tubercles, as is usual, but at once appears as an unpaired, or single organ. The pupa state lasts for five or six days, and when the imago appears it eats its way through a small round opening in the end of the skin of its host, the Agrion larva. The development of Ophloneurus, another egg-parasite, agrees with that of Platygaster and Polynema.
The labium, which is divided into three joints, becomes flattened towards the tip, which is square, and ends in two thin membranous lobes, probably endowed with a slight sense of touch. On comparing these parts with those of the louse, it will be seen how much alike they are with the exception of the labium, a very variable organ in the Hemiptera.
Lee mentions a woman of thirty-five with four mammae and four nipples; she suckled with the pectoral and not the axillary breasts. McGillicudy describes a pair of rudimentary abdominal mammae, and there is another similar case recorded. Hartung mentions a woman of thirty who while suckling had a mamma on the left labium majus.
The mouth-parts of the caterpillar exist in the moth. They are aborted in the adult. While the maxillæ are as a rule greatly developed in the moth, in the caterpillar they are minute and almost useless. The labium or second maxillæ, so large in the moth, serves simply as a spinneret in the caterpillar.
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