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312 with a greenish-yellow spot on each side, the three intermediate joints of the same colour with violet-black in the centre; antennæ and tarsi testaceous; wings pale fulvous.

ATHALIA CENTIFOLIÆ. XXX. Fig. 3. Fig. 4, Caterpillar. is the Turnip saw-fly, which has occasioned so much loss to agriculturists within the last few years. It is about four lines in length, the figure on Pl. XXX. being considerably magnified in order to show the parts more distinctly. The general colour is bright orange yellow; antennæ and head black, the underside of the former dull yellow; palpi yellow; thorax black, the collar, a triangular spot in front and sometimes one behind, reddish-orange; abdomen and legs reddish-yellow, the tips of all the tarsal joints and of the tibiæ black; wings yellowish at the base, the costa and stigma dark-brown. The caterpillar, (Pl. XXX. fig. 4,) has six pectoral, fourteen abdominal, and two anal feet. It is of a dull slate or greyish-black colour, with a somewhat lighter line along the sides just above the feet. It is known in different parts of the country by the names of black palmer, black canker, black slug or caterpillar, negro or nigger. Full descriptions and history of this insect, which it is desirable should be well known in order that some remedy may be devised against its depredations, will be found in Mr. Yarrell's paper in the second