. British naturalist. I894.] THE BRITISH NATURALIST. 137 the buds. So far as is known at present, these insects are plant feeders, and I merely mention the fact that it may not be lost sight of. In conclusion, I beg to thank Mr. A. T. Gillanders for the liberal supply, from time to time, of infested shoots ; and also Mr. John Pickering, of Poole Hall, Cheshire, for kindly forwarding a number of infested bushes. The latter were planted at the rear of our Museum, thus affording every opportunity of observing the disease. SOME CURIOUS AQUATIC LARVAE. BY GEORGE SWAINSON, (Continued from pag
. British naturalist. I894.] THE BRITISH NATURALIST. 137 the buds. So far as is known at present, these insects are plant feeders, and I merely mention the fact that it may not be lost sight of. In conclusion, I beg to thank Mr. A. T. Gillanders for the liberal supply, from time to time, of infested shoots ; and also Mr. John Pickering, of Poole Hall, Cheshire, for kindly forwarding a number of infested bushes. The latter were planted at the rear of our Museum, thus affording every opportunity of observing the disease. SOME CURIOUS AQUATIC LARVAE. BY GEORGE SWAINSON, (Continued from page 110.) The reason of our particular interest however, in the larva of Chivonomus dor salts, was its very striking resemblance in all but colour to the marine annelid Campontia cruciformis, of Johnston, which had several times been captured on sea-weed and Zoophytes; for it is now certain that McLeay's guess was correct, and that this reputed marine worm is the larva of a Dipterous fly. We have several specimens of this form which we have mounted and stained with picro-carmine, and it is almost impossible to distinguish them, even under the microscope, from C. dorsalis. The mandibles, antennae and the two pairs of false feet or pro-legs with horny hooklets, the intestinal canal, and lastly the two pairs of long respiratory retractile tubules which the larva can protrude from the eleventh segment, made it no longer possible to doubt that Campontia was the larva of a marine midge of the Chivonomidce FIG. I CAMPONTIA CRUCIFORMIS. MARINE LARVA OF MIDGE. Thalassomyia Frauenfeldi of Schiner. The great difference when alive is in the colour, for instead of the bright red of the u Harlequin " or Bloodworm you have in Campontia a transparent sea-green colour. In fact the hcemoglobin which gives the blood plasma in the " Harlequin" larva its beautiful tint, is replaced in the marine form by a light sea-green pigment with which the fat cells are coloured. On one oc
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