. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 492 Messrs. N. A. Cobb and A. S. Olliff on rior margin of the first thoracic segment; but this is not really the case. The appearance is deceptive, and is merely due to the fact that the " supplementary segment," or, more correctly, the hinder division of the head, is partly withdrawn into the first thoracic segment. Our larva has the protrusile labium which is common to all the species of the family, and the anal segment of the body is provided with a retrac- tile o
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 492 Messrs. N. A. Cobb and A. S. Olliff on rior margin of the first thoracic segment; but this is not really the case. The appearance is deceptive, and is merely due to the fact that the " supplementary segment," or, more correctly, the hinder division of the head, is partly withdrawn into the first thoracic segment. Our larva has the protrusile labium which is common to all the species of the family, and the anal segment of the body is provided with a retrac- tile organ, which probably assists the larva in locomotion. We did not observe that this particular larva possessed the power of jumping, as some of its allies are said to do. When young the specimens were dull white in colour, but afterwards they turned to a bright orange-yellow. In the latter state they measured If millimetres; but perhaps they were scarcely full-grown. In explaining,more particular reference is made to the side or profile view (fig. 1). This figure shows the head and part of the thorax of a Fig. 1. young larva. The tho- racic rings bear rows of bristles, so that the be- ginning of the thorax is readily made out. In the illustration the head is not fully extended; therefore the eyes, two collections of dark- coloured granules just in front of the brain, appear as if situated in the first segment of the thorax. The downward-pointing nozzle is seen in front, Head and Prothorax of young Cecidomyia and on the forehead above Larva (profile). it two finger - shaped Above a single proportionately feelers or antennas. Ihe enlarged. jaw - muscles, situated inside the forehead just behind the antenna?, are attached to the mouth-parts below and to the wall of the head above. The most con- spicuous feature of the head, however, is a pair of dark- coloured three-pronged pieces of horn (of which only the nearer one is shown in the large profile view), so arranged as t
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