be spared for dissection, the neuration can be made out by denuding a small portion of the under-surface with a camel's-hair brush moistened; the part requiring denudation is the neighbourhood of the areole, as in general the other veins can be sufficiently discerned on the lower surface under a lens. Of course the student should first make himself acquainted by full dissection with the ordinary position of the veins, and the nature of the more important points to be observed. I will repeat here the explanation given in a former paper of the mode of reckoning the veins, with special reference to the Geometrina. These are numbered in order, beginning from that nearest to the inner margin, and ending with that nearest to the costa. The forewings have normally 12 veins, of which 1 and 12 rise separately, the rest from the margins of a central cell. Similarly the hindwings have normally 8 veins, of which 1 and 8 are separate, the rest rising from a central cell. Sometimes a vein may be obsolete, especially in the hindwings, which thus appear to have only 7. The veins are assumed to rise from the cell independently of one another, unless otherwise stated. Rarely there is a small additional free vein vetween 1 and the inner margin; this is termed 1a. The veins rising from the upper margin of the cell are in the Geometrina constantly liable to unite for a short distance in the middle of their course, and then separate again; this I have termed anastomosing. In consequence of it, there is usually formed a small additional cell (termed the areole) upon the margin of the main cell; this areole may be single, double, or even triple (though not in New Zealand), according to the number of veins anasto-mosing. Vein 12 is also liable to anastomose with 11. This curious structure is highly characteristic of the group. Other organs require little explanation. The length of the ciliations or pectinations of the antennæ is given by numbers in brackets, and is expressed in terms of the breadth of the antennal stalk; where the two series of pectinations are unequal, the inner series is denoted by a, the outer by b prefixed to these numbers. Geometrina. Ocelli always absent. Tongue well-developed. No maxillary palpi. Labial palpi well-developed, usually porrected, roughly scaled. Antennæ moderate, filiform, or dentate, simple, ciliated, or pectinated, pectinations diminishing in length towards base and apex. Abdomen and legs without special characters. Forewings with 12 veins (rarely vein 11 obsolete), 1 simple, 7, 8, and 9 always on a common stalk, 10 generally anastomosing with 9, 11 generally anastomosing with 10, 12 sometimes anastomosing with 11. Hindwings with 8 veins (often 7 by obsolescence of 5), normal vein 8 free or anastomosing with 7 towards base, always leaving 7 before the transverse vein.