. An introduction to zoology, with directions for practical work (invertebrates). CHAPTEE XXI INSECTA (continued) Order V. : Neukoptera (continued) Family 2 : Ephemeridae (the May-flies) The May-flies, like the Dragon-flies, have aquatic larvae, and there is a gradual metamorphosis, the wings growing rapidly at the last moult. The second pair of wings is always much smaller than the first pair. The head bears short antennae, and three ocelli, as well as a pair of large, some- times subdivided, compound eyes. The mouth-parts are very degenerate, for the imago does not feed during its short life
. An introduction to zoology, with directions for practical work (invertebrates). CHAPTEE XXI INSECTA (continued) Order V. : Neukoptera (continued) Family 2 : Ephemeridae (the May-flies) The May-flies, like the Dragon-flies, have aquatic larvae, and there is a gradual metamorphosis, the wings growing rapidly at the last moult. The second pair of wings is always much smaller than the first pair. The head bears short antennae, and three ocelli, as well as a pair of large, some- times subdivided, compound eyes. The mouth-parts are very degenerate, for the imago does not feed during its short life. Type : The Common May-fly (Ephemera vulgata). The history of these insects is one that holds the imagina- tion. For two or three years, the dingy little brown larvae may live partially buried in the mud or decaying vegetation at the bottom of pond or river, swimming actively, if disturbed, by whisking their tails, but taking refuge as soon as possible in the mud or amongst the vegetation, remaining very still with tail uplifted, as shown in Fig. 230. Then, one evening in summer, hundreds of them rise together to the surface, split their larval skins, and, in a few brief moments, up dart the winged flies, soon, however, to come to rest again in order to 308. Fig. 230.—Larva of the Com- mon May-fly, resting on a piece of Canadian Water- 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 Lulham, Rosalie Blanche Jermaine. London, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1913
